WO2004051845A1 - 増幅回路 - Google Patents
増幅回路 Download PDFInfo
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- WO2004051845A1 WO2004051845A1 PCT/JP2003/015468 JP0315468W WO2004051845A1 WO 2004051845 A1 WO2004051845 A1 WO 2004051845A1 JP 0315468 W JP0315468 W JP 0315468W WO 2004051845 A1 WO2004051845 A1 WO 2004051845A1
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- effect transistor
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/56—Modifications of input or output impedances, not otherwise provided for
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
Definitions
- the present invention relates to an amplifier circuit for amplifying a high frequency signal and a variable gain amplifier circuit having a plurality of the amplifier circuits.
- FIG. 11 is a circuit diagram showing an example of a conventional variable gain amplifier circuit.
- the variable gain amplifier circuit shown in FIG. 11 includes a variable attenuator 91, an amplifier 92 connected in series with the variable attenuator 91, and a power. This variable gain amplifier circuit controls the amplification degree of the entire amplification circuit by changing the amount of attenuation of the variable attenuator 91.
- FIG. 12 is a circuit diagram showing another example of the conventional variable gain amplifier circuit.
- the variable gain amplifier circuit shown in FIG. 12 includes a variable attenuator 93, an amplifier 94 connected in parallel with the variable attenuator 93, and a switch for selecting one of the variable attenuator 93 and the amplifier 94. 9 and 5 ⁇ Pi 9 5 2, and a.
- the amplifier 9 4 is selected (Fig. 1 2 shows a state in which the amplifier 9 4 is selected), switch and by connecting the 9 5 2 are both variable Atsuteneta 9 3 terminal, variable Atsuteneta 9 3 is selected.
- FIG. 13 is a circuit diagram showing still another example of the conventional variable gain amplifier circuit disclosed in Japanese Patent Application Laid-Open No. 2001-345653.
- Variable gain amplifier circuit shown in Figures 1 to 3 a plurality of amplifiers 9 6 ⁇ optimum 9 6 N, amplifier A demodulator 97 connected in series to each of the components 96 i to 96 N is provided. Amplifier 9 6 to 9 6 N have mutually different gains, respectively.
- variable gain amplifier circuit only an amplifier suitable for obtaining a desired gain is turned on, and the other amplifiers are turned off. This results in a high impedance output and only the amplifiers that are turned off are electrically disconnected from the demodulator 97.
- variable gain amplifier shown in FIG. 11 since the variable attenuator 91 is arranged at the first stage, the loss directly deteriorates the noise figure, and the noise figure cannot be improved.
- the amplifier 92 performs the amplification operation, so that power is constantly consumed. For example, the amplifier 92 always performs an amplification operation even when the input is large and therefore a large amplification degree is not required. As a result, the operating time cannot be extended for devices that run on batteries that have a limited life, such as mobile terminals.
- variable gain amplifying circuit shown in FIG. 12, a plurality of switches (two in FIG. 12) are used. (Not shown). Therefore, power consumption increases as a whole.
- the loss of the switch is large, so that the power consumption required to obtain the desired gain is further increased.
- the variable gain amplifier circuit shown in FIG. 13 can be applied to a frequency of about several tens of MHz, such as the IF band.
- the load resistance of the amplifiers 96 to 96 N is set to about 50 ohms to 200 ohms.
- the off-state impedance drops due to the parasitic capacitance of the semiconductor device, and the output of the amplifier that is turned off does not have sufficiently high impedance.
- the present invention has been made in view of the above-described problems, and has been made in order to improve input / output. It is an object of the present invention to provide an amplifier circuit which can have a high impedance and which can obtain high gain with low power consumption.
- An object of the present invention is to provide a variable gain amplifier circuit which is excellent in life and has a wide variable gain range.
- the present invention provides an amplifying element for amplifying a signal input via an input terminal and outputting the amplified signal to an output terminal, and at least one of an input impedance and an output impedance of the amplifying element And a control circuit for increasing the impedance of the amplifying circuit.
- one or both of the input impedance and the output impedance are set to a high impedance by the control circuit, so that electrical connection / disconnection is switched without inserting a switch into the signal path. And no loss is caused by inserting a switch.
- control circuit can be composed of an inductance element and a switch element.
- the inductance element and the switch element are connected in series with each other, and are alternately connected between the input terminal or the output terminal and a ground potential.
- the switch element can be composed of, for example, a field effect transistor.
- the inductance element has an inductance value that resonates in parallel with a capacitance parasitic to the amplification element.
- the control circuit has, for example, one end connected to the input terminal or the output terminal. At least two transmission lines including at least a first transmission line, and a second transmission line having one end grounded, the sum of the lengths being an odd multiple of a quarter of the applicable wavelength; A switch capable of switching between a terminal or the output terminal and the ground potential via a transmission line with an odd multiple of 1/4 of the applicable wavelength or a shorter transmission line. And an element.
- the transmission line shorter than an odd multiple of one-fourth of the applicable wavelength functions as an inductor having a value that resonates in parallel with the parasitic capacitance of the amplifying element.
- the amplifying element may be composed of, for example, two cascode-connected field effect transistors.
- the amplifier circuit according to the present invention may be configured to further include a field-effect transistor connected in series between the amplification element and a power supply. This field effect transistor cuts off current from the power supply to the amplification circuit when the amplification circuit is off.
- the amplifier circuit according to the present invention can be configured as a differential amplifier circuit.
- a field effect transistor for a constant current source is additionally arranged between the amplifying element and the ground potential.
- the present invention includes at least two amplifier circuits having mutually different gains and connected in parallel with each other, wherein the amplifier circuit includes any one of the amplifier circuits described above, and any one of the amplifier circuits
- Another object of the present invention is to provide a variable gain amplifier circuit capable of changing a gain by setting at least one of the input impedance and the output impedance of another amplifier circuit other than a selected amplifier circuit to a high impedance. . '' Brief description of the drawings
- FIG. 1 is a circuit diagram of a variable gain amplifier circuit according to one embodiment of the present invention.
- FIG. 2 is a circuit diagram showing a first example of a configuration of an amplifier circuit constituting the variable gain amplifier circuit shown in FIG.
- Fig. 3 explains the principle that the amplifier circuit shown in Fig. 2 enters a high impedance state. It is a figure for clarification.
- FIG. 4 is a circuit diagram showing a second example of the configuration of the amplifier circuit constituting the variable gain amplifier circuit shown in FIG.
- FIG. 5 is a circuit diagram showing a third example of the configuration of the amplifier circuit constituting the variable gain amplifier circuit shown in FIG.
- FIG. 6 is a circuit diagram showing a fourth example of the configuration of the amplifier circuit forming the variable gain amplifier circuit shown in FIG.
- FIG. 7 is a circuit diagram showing a fifth example of the configuration of the amplifier circuit forming the variable gain amplifier circuit shown in FIG.
- FIG. 8A is a circuit diagram showing characteristics of an amplification circuit constituting a variable gain amplifier circuit according to an embodiment of the present invention
- FIG. 8B is a circuit diagram showing characteristics of a conventional variable gain amplifier circuit.
- FIG. 9 is a graph showing the relationship between the frequency and the gain in each of the variable gain amplifier circuits shown in FIGS. 8 (a) and 8 (b).
- FIG. 10 is a graph showing the relationship between the frequency and the noise index in each of the variable gain amplifier circuits shown in FIGS. 8 (a) and 8 (b).
- FIG. 11 is a circuit diagram showing an example of a conventional variable gain amplifier circuit.
- FIG. 12 is a circuit diagram showing another example of the conventional variable gain amplifier circuit.
- FIG. 13 is a circuit diagram showing still another example of the conventional variable gain amplifier circuit.
- FIG. 1 is a circuit diagram showing a configuration of a variable gain amplifier circuit 1000 according to one embodiment of the present invention.
- the variable gain amplifier circuit 1000 according to the present embodiment includes N amplifier circuits 10 to 100 N (N is a positive integer of 2 or more), and these N amplifier circuits 100 i to 10 ON are The input terminal IN and the output terminal OUT are connected in parallel with each other.
- the input terminal IN is input terminals of all of the amplifier circuit 100i to 100 N are connected, the output terminals of all of the amplifier circuit 100i to 100 N are connected to the output terminal OUT.
- All of the amplifier circuits 100 to 100 N have the same configuration, but their gains are different.
- control voltage Vc 1 to V c N is applied to each of the amplifier circuits 100 1 to 100 N, it is possible and child individual amplifier 100 to 10 ON to high impedance. Further, the control voltage V c 1 to V c N, it is possible to select whether or not to connect to the input terminal IN and an output terminal OUT of each amplifier 100 to 100 N. Therefore, for example, by selecting one of the amplifier circuits and making this amplifier circuit a high impedance, or making the other amplifier circuit a high impedance, the gain of the variable gain amplifier circuit 1000 is set to a desired value. can do.
- FIG. 2 is a diagram illustrating a first example of a configuration of the amplifier circuits 100 to 10 ON included in the variable gain amplifier circuit 1000 according to the present embodiment.
- the amplifier circuit 10 OA of the first example is a single-ended amplifier circuit.
- the amplifier circuit 100A includes a first inductor 201, a second inductor 203, a third inductor 204, a fourth inductor 205, a fifth inductor 206, a resistor 202, a capacitor 207, and a first field effect transistor. 208, a second field effect transistor 209 and a third field effect transistor 210, One end of the first inductor 201 is connected to the input terminal IN and one end of the resistor 202, and the other end is connected to the gate of the first field-effect transistor 208 and one end of the second inductor 203. .
- One end of the resistor 202 is connected to the input terminal IN and one end of the first inductor 201, and the other end is set to the gate bias potential Vgbias.
- One end of the second inductor 203 is connected to the other end of the first inductor 201 and the gate of the first field-effect transistor 208, and the other end is connected to the drain of the second field-effect transistor 209. I have.
- the gate of the first field-effect transistor 208 is connected to the other end of the first inductor 201 and one end of the second inductor 203, and the drain is the third inductor 204, the fourth inductor 205, and the fourth inductor 205.
- the five inductors 206 are connected to one end of each, and the source is grounded.
- the control voltage Vc is supplied to the gate of the second field-effect transistor 209, the drain is connected to the other end of the second inductor 203, and the source is grounded.
- One end of the third inductor 204 is connected to one end of each of the fourth inductor 205 and the fifth inductor 206 and the drain of the first field-effect transistor 208, and the other end is connected to the third field-effect transistor. It is connected to the 210 drain.
- the control voltage Vc is supplied to the gate of the third field-effect transistor 210, the drain is connected to the other end of the third inductor 204, and the source is grounded.
- One end of the fifth inductor 206 is connected to one end of each of the third inductor 204 and the fourth inductor 205 and the drain of the first field-effect transistor 208, and the other end is connected to the power supply voltage Vdd. Supplied.
- One end of the fourth inductor 205 is connected to one end of each of the third inductor 204 and the fifth inductor 206 and the drain of the first field-effect transistor 208, and the other end is connected to one end of the capacitor 207. It is connected to the output terminal OUT.
- One end of the capacitor 207 is connected to the other end of the fourth inductor 205 and the output terminal OUT, and the other end is grounded.
- the first inductor 201, the fourth inductor 205, the fifth inductor 206 and the capacitor 207 function as an input / output matching circuit.
- the fifth inductor 206 It also has a function as a yoke inductor.
- Resistor 202 applies a gate bias to the input signal.
- the first field-effect transistor 208 is a main amplification element of the amplification circuit 100A.
- the control voltage Vc is a control voltage for turning on and off the amplifier circuit 100A.
- the second and third field effect transistors 209 and 210 as switch elements and the second and third inductors 203 and 204 for resonance form a control circuit.
- the amplification circuit 10 OA switches between an on state and an off state by controlling this control circuit.
- the amplifier circuit 10OA when the control voltage Vc is set to a high level (for example, the power supply voltage Vdd) and the gate bias potential Vgbias is set to 0 V, the amplifier circuit 10OA is turned off.
- the control voltage Vc when the control voltage Vc is set to a low level (for example, 0 V) and the gate bias potential Vgbias is set to the operating potential, the amplifier circuit 100A is turned on.
- the operating potential is a gate bias value at which the first field-effect transistor 208 operates as an amplifier.
- the amplifier circuit 100A When the amplifier circuit 100A is on, the amplifier circuit 100A is electrically connected to the input terminal IN and the output terminal OUT, amplifies the signal input through the input terminal IN, and outputs the amplified signal to the output terminal OUT. Supply. When the amplifier circuit 100A is in the off state, the amplifier circuit 100A has high impedance on both the input and output sides, and is therefore electrically disconnected from the input terminal IN and the output terminal OUT.
- FIG. 3 is a diagram for explaining the principle that the amplifier circuit 10OA shown in FIG. 2 enters a high impedance state.
- FIG. 3 a description will be given of the principle that the amplifier circuit 10OA enters a high impedance state.
- FIG. 3 (a) shows the input side of the amplifier circuit 10OA when the control signal Vc is set to the high level to turn on the second and third field effect transistors 209 and 210 and the gate bias potential V gbias is set to 0 V
- FIG. 3B is a circuit diagram of an equivalent circuit on the output side of the amplifier circuit 10OA in a similar case.
- the first field-effect transistor 208 is off. Therefore, when viewed from the gate side (Fig. 3 (a)) and the drain side (Fig. 3 (b)) of the first field-effect transistor 208, it is shown in Figs. 3 (a) and 3 (b).
- the capacitance of the circuit can be seen as the gate capacitance and the drain capacitance of the intrinsic semiconductor of the device, that is, the capacitances 320 and 321.
- the value of the inductor 303 is determined so that the inductor 303 and the capacitor 320 resonate in parallel with each other.
- the value of the inductor 304 is determined such that the inductor 304 and the capacitor 321 resonate in parallel. Thereby, the input impedance and the output impedance can be increased.
- the values of the capacitances 320 and 321 vary depending on the generation of the process and the size of the gate. For example, for a field-effect transistor having a gate width of 300 m, it is about 300 fF. Assuming an amplifier circuit with a frequency of 5 GHz for a capacitance of about 300 fF, the inductors 303 and 304 should be about 3 nH. With such an inductor, it can be easily formed on IC by wiring. In addition, when the amplifier circuit 10OA performs a normal amplification operation while being on, the second and third field-effect transistors 209 and 210 are off.
- the off-state resistance is set high. Furthermore, the off-shunt parasitic capacitance is kept small, and the impedance is high. Therefore, when the second and third field effect transistors 209 and 210 are off, the inductors 303 and 304 are in a floating state.
- the input / output impedance of the amplifier circuit 100A can be increased in a high frequency band exceeding the GHz order without inserting a switch in the signal path. Therefore, in the variable gain amplifier circuit 100 according to the present embodiment in which the amplifier circuits 100 OA to 100 ON having the same configuration as the amplifier circuit 100 OA are connected in parallel, the variable range of the gain is widened. Alternatively, the high gain and the low noise index can be maintained even if the variable steps of the gain are finely adjusted.
- FIG. 4 is a diagram showing a second example of the amplifier circuit 1 0 to 1 0 0 N structure constituting the variable gain amplifier circuit 1 0 0 0 according to the present embodiment.
- the amplifier circuit 100B shown in FIG. 4 is different from the amplifier circuit 100A shown in FIG. 2 only in that it has a fourth field-effect transistor 400 as a second amplifier element. Is different.
- the first field-effect transistor 208 as the first amplifying element and the fourth field-effect transistor 400 are cascode-connected to each other.
- the first control voltage VcA is applied to the gate of the fourth field-effect transistor 400, and the drain is each of the third inductor 204, the fourth inductor 205, and the fifth inductor 206. Is connected at one end, and the source is connected to the drain of the first field-effect transistor 208.
- a second control voltage VcB is applied to each gate of the second and third field-effect transistors 209 and 210.
- the first and fifth field-effect transistors 208 and 400 are main amplifying elements of the amplifier circuit 100B.
- the first and second control voltages VcA and VcB are control voltages for turning on / off the amplification circuit 100B, and have a complementary relationship.
- the amplification circuit 100 B controls the control circuit including the second and third field-effect transistors 209 and 210 and the second and third inductors 203 and 204 by controlling It can be switched between an on state and an off state.
- the amplification circuit 100 B becomes It turns off.
- the operating potential is a gate bias value at which the first field-effect transistor 208 operates as an amplifier.
- the amplifier circuit 100B When the amplifier circuit 100B is on, the amplifier circuit 1'00B is electrically connected to the input terminal IN and the output terminal OUT, and amplifies the signal input through the input terminal IN. And output terminal OUT. When the amplifier circuit 100B is in the off state, the amplifier circuit 100B has a high impedance on both the input and output sides, and is therefore electrically disconnected from the input terminal IN and the output terminal OUT.
- the principle of the present amplifier circuit 100B being in a high impedance state is the same as that of the amplifier circuit 100OA shown in FIG.
- the capacitance between the input terminal IN and the output terminal OUT is reduced by the cascode connection of the two field-effect transistors 209 and 408. It can operate in a higher frequency band than the amplifier circuit 10 OA shown in FIG.
- Figure 5 is a diagram showing a third example of the configuration of the amplifier circuit 1 0 0 ⁇ optimum 1 0 0 N constituting the variable gain amplifier circuit 1 0 0 0 according to the present embodiment.
- the amplifier circuit 100C shown in FIG. 5 is different from the amplifier circuit 100B shown in FIG. 4 only in that it has a fifth field-effect transistor 401 for interrupting current. I have.
- the fifth field-effect transistor 401 is arranged in series between the matching inductor 206 and the power supply and the voltage Vdd. Specifically, the second control voltage V c B is applied to the gate of the fifth field-effect transistor 401, the power supply and the voltage V dd are supplied to the drain, and the source is connected to the fifth inductor 206. Connected to one end.
- the fifth field effect transistor 401 cuts off the supply of current from the power supply to the main amplifier circuit 100 C when the main amplifier circuit 100 C is in the off state.
- Figure 6 is a diagram showing a fourth example of the amplifier circuit 1 0 to 1 0 0 N structure constituting the variable gain amplifier circuit 1 0 0 0 according to the present embodiment.
- the amplifier circuit 100D shown in FIG. 6 is different from the amplifier circuit 100C shown in FIG. It differs only in that it is configured as a differential amplifier circuit and in that it has a sixth field-effect transistor 613 for a constant current source.
- each element of the amplifier circuit 100C other than the fifth field-effect transistor 401 includes It has been replaced as follows:
- the first inductor 201 is replaced by a pair of inductors 601a and 601b arranged in parallel with each other, and the resistor 202 is a pair of resistors 602a connected to each of the pair of inductors 60la and 601b. , 602b.
- the second inductor 203 is replaced by a pair of inductors 603a and 603b, and the second field effect transistor 209 is replaced by a pair of field effect transistors 609a and 609b.
- the fifth inductor 206 is connected to a pair of inductors 606a and 606b
- the fourth field-effect transistor 400 is connected to a pair of field-effect transistors 611a and 611b
- the first field-effect transistor 208 is connected to a pair of field-effect transistors.
- Transistors 608a and 608b have been replaced respectively.
- the third inductor 204 is replaced by a pair of inductors 604a and 604b
- the third field-effect transistor 210 is replaced by a pair of field-effect transistors 610a and 610b, respectively.
- the fourth inductor 205 is replaced by a pair of inductors 605a and 605b, and the capacitor 207 is replaced by a pair of capacitors 607a and 607b.
- the sixth field effect transistor 613 is arranged between each source of the first field effect transistors 608a and 608b as an amplifier and the ground potential. Specifically, a gate bias potential Vs, which is an operating potential, is applied to the gate of the sixth field-effect transistor 613, the drain is connected to each source of the first field-effect transistors 608a and 608b, and the source is grounded. Have been.
- Vs which is an operating potential
- the gate bias potential Vg bias of the first field-effect transistors 608a and 608b and the gate bias potential Vs of the sixth field-effect transistor 613 for the constant current source are set to the operating potential, and the control voltage VcA is set high.
- the fourth field-effect transistors 211a and 211b and the fifth field-effect transistor 401 are turned on, and the second field-effect transistors 609a and 609b and the third field-effect transistor are turned on.
- the transistors 610a and 610b are turned off. As a result, the second inductor
- 603a, 603b and the third inductor 604a, 604b are in a floating state, and the amplifier circuit 100D performs a normal amplification operation.
- the fourth field effect transistor 6 1 1 a, 6 1 1 b and the fifth field-effect transistor 4 0 1 is turned off, the second field effect transistor 6 0 9 a, 609 b and the third field-effect transistors 610 a and 61 ob are turned on.
- the second inductors 603 a, 603 b and the third inductor 604 a, 604 b are grounded, and the second field effect transistors 609 a, 609 b and the second
- the input / output impedance of the amplifier circuit 100D increases due to parallel resonance with the capacitance of the three field-effect transistors 6100a and 610b.
- FIG. 7 is a diagram showing a fifth example of the configuration of the amplifier circuits 100 to 100 ON constituting the variable gain amplifier circuit 100 according to the present embodiment.
- the amplifier circuit 100E shown in FIG. 7 is configured using a transmission line. As shown in FIG. 7, the present amplifier circuit 100 E includes a first transmission line 721, a second transmission line 722, a third transmission line 723, and a first field-effect transistor 72. 0, a second field effect transistor 724, a third field effect transistor 725, and an output matching circuit 726.
- One end of the first transmission line 721 is connected to the input terminal IN, and the other end is connected to one end of the second transmission line 722 and the gate of the first field-effect transistor 720.
- One end of the second transmission line 722 is connected to the other end of the first transmission line 721 and the gate of the first field effect transistor 720, and the other end is a second and third field effect transistor.
- One end of the third transmission line 723 is connected to the source of the second field-effect transistor 724, and the other end is grounded.
- the gate of the first field-effect transistor 720 is connected to the other end of the first transmission line 721 and one end of the second transmission line 722, and the drain is connected to the output terminal OUT via the output matching circuit 726. And the source is grounded.
- the second control voltage V c B is applied to the gate of the second field-effect transistor 724, and the drain is connected to the other end of the second transmission line 722 and the third field-effect transistor 725.
- the source is connected to one end of the third transmission line 723.
- the first control voltage VcA is applied to the gate of the third field-effect transistor 725, the drain is connected to the other end of the second transmission line 722 and the drain of the second field-effect transistor 724, and the source is grounded. Have been.
- the first control voltage VcA is complementary to the second control voltage VcB.
- the first transmission line 721 matches input, and the output matching circuit 726 matches output.
- the first field-effect transistor 720 is a main amplification element of the amplification circuit 100E.
- the length of the second transmission line 722 is shorter than a quarter of the wavelength of the signal to which the present amplifier circuit 100E is applied. Therefore, the second transmission line 722 acts as an inductor.
- the length of the second transmission line 722 is set to a value such that the inductance of the second transmission line 722 resonates in parallel with the gate capacitance of the first field-effect transistor 720.
- the sum of the length of the second transmission line 722 and the length of the third transmission line 723 corresponds to a quarter (or an odd multiple thereof) of the wavelength of the signal to which the amplifier circuit 100E is applied. It is decided.
- Each of the second and third field-effect transistors 724, 725 constitutes a three-piece (Single-PoleSingle-Throw) switch. Further, the second and third field effect transistors 724 and 725 are controlled by the first and second control voltages V cA and V cB which are in a complementary relationship, respectively.
- the second field effect transistor 724 turns off and the third field effect transistor 725 turns off. Turn on. Thereby, the third transmission line 723 is disconnected from the amplification circuit 100E, and the second transmission line 722 is directly grounded. Since the second transmission line 722 is shorter than a quarter of the wavelength, it acts as an inductor, and its inductance has a value such that it resonates in parallel with the gate capacitance of the first field-effect transistor ⁇ 20.
- This amplifier circuit 100 E is high Impedance.
- the second field effect transistor 724 is turned on and the third field effect transistor 725 is turned off. become. Accordingly, the third transmission line 723 is electrically connected to the second transmission line 722 via the second field effect transistor 724.
- the sum of the lengths of the second transmission line 722 and the third transmission line 723 is a quarter wavelength, and the other end of the third transmission line 723 is grounded. Looking at the second and third transmission lines 722 and 723 from the gate, the impedance is infinite. The second transmission line 722 and the third transmission line 723 whose impedance looks infinite have no effect on the gate of the first field-effect transistor 720. Therefore, the present amplification circuit 100E only performs a normal amplification operation without being affected by the second transmission line 722 and the third transmission line 723.
- the gate bias voltage is set so that the first field-effect transistor 720 does not perform the amplification operation. Must be set.
- FIG. 8A is a circuit diagram of a variable gain amplifier circuit using any of the amplifier circuits 100A to 100E described above
- FIG. 8B is a circuit diagram of a conventional variable gain amplifier circuit.
- the variable gain amplifying circuit shown in FIG. 8A includes an amplifying circuit 832, an amplifying circuit 830 connected in series to the output of the amplifying circuit 832, and a series circuit connected to the output of the amplifying circuit 832. And an attenuator 831 connected in parallel to the amplifier circuit 830.
- the amplification circuit 830 can select whether or not to configure a parallel resonance circuit including the gate capacitance and the inductor of the amplification field-effect transistor by switching the field-effect transistor for the switch.
- a c- parallel resonant circuit with a simple configuration is configured, the input and output of the amplifier circuit 830 become high impedance. And is electrically disconnected from the variable gain amplifier circuit.
- the amplifier circuit 830 is configured by any one of the amplifier circuits 100A to 100E described above.
- the variable gain amplifier circuit shown in FIG. 8 (b) is connected in series with the amplifier circuit 832 and the output of the amplifier circuit 832, similarly to the variable gain amplifier circuit shown in FIG. 8 (a). And an attenuator 831 connected in series with the output of the amplifier circuit 830 and in parallel with the amplifier circuit 833.
- the amplifying circuit 833 differs from the amplifying circuit 830 in that a switching field-effect transistor is inserted in a signal path, and whether or not the field-effect transistor is electrically connected to the variable gain amplifier circuit is determined by turning on and off the field-effect transistor. The configuration is selected.
- FIG. 9 is a graph showing the relationship between the frequency and the gain in each of the variable gain amplifier circuits shown in FIGS. 8 (a) and (b).
- FIG 9 shows the gain characteristics when the amplifier circuits 830 and 833 are electrically connected to the variable gain amplifier circuit (high gain operation), and the gain characteristics when the amplifier circuits 830 and 833 are electrically disconnected from the variable gain amplifier circuit (low gain operation). The gain characteristics are shown.
- FIG. 10 is a graph showing the relationship between the frequency and the noise index in each of the variable gain amplifier circuits shown in FIGS. 8 (a) and 8 (b).
- the gain at the time of high gain operation is about 5 dB higher in the variable gain amplifier of FIG. 8 (a) than in the variable gain amplifier of FIG. 8 (b).
- the noise exponent of the variable gain amplifier of FIG. 8 (a) is about 0.2 dB lower than that of the variable gain amplifier of FIG. 8 (b). This is because in the variable gain amplifying circuit of FIG. 8B, a loss due to a signal occurs in a field effect transistor for a switch inserted in a signal path. If this loss is compensated for by increasing the gain of the amplifier circuit, the current consumption will increase by about 50%. In other words, the variable gain amplifying circuit in Fig. 8 (a) It can be said that the power consumption reduction effect of the amplifier circuit is reduced by 50%.
- FIG. 9 there is almost no difference in gain between the variable gain amplifier circuits in FIGS. 8 (a) and 8 (b) in the low gain operation. This is because the individual amplifier circuits 830 and 833 are electrically well disconnected from the variable gain amplifier circuits. In other words, it can be said that the input and output of the amplifier circuit have a favorable high impedance.
- one or both of the input impedance and the output impedance are set to high impedance by the control circuit, so that electrical connection / disconnection can be switched without inserting a switch in the signal path.
- high gain can be obtained with low power consumption without loss due to the introduction of a switch.
- the high impedance can be obtained even in the high frequency band.
- a decrease in impedance can be offset by an inductance element that resonates in parallel with a parasitic capacitance at a predetermined frequency, so that a high impedance can be obtained at a predetermined frequency.
- variable gain amplifier circuit of the present invention when each of the amplifier circuits constituting the variable gain amplifier circuit is not selected, the input and output can be made high impedance. As a result, high gain can be maintained even when the number of amplifier circuits connected in parallel is large. Low current consumption can be realized.
Abstract
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Priority Applications (1)
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US10/537,470 US7298215B2 (en) | 2002-12-04 | 2003-12-03 | Amplifying circuit |
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JP2002-352664 | 2002-12-04 | ||
JP2002352664A JP3951123B2 (ja) | 2002-12-04 | 2002-12-04 | 増幅回路 |
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JP2006197227A (ja) * | 2005-01-13 | 2006-07-27 | Renesas Technology Corp | 可変利得増幅回路、受信機及び送信機 |
US20080143442A1 (en) * | 2005-02-07 | 2008-06-19 | Erik Hemmendorff | Electrical Circuit |
CN101917167B (zh) | 2010-08-24 | 2014-05-14 | 惠州市正源微电子有限公司 | 射频功率放大器功率合成电路 |
US8803602B2 (en) | 2012-07-06 | 2014-08-12 | Analog Devices, Inc. | Common mode bias circuit |
US9509253B2 (en) * | 2014-02-13 | 2016-11-29 | Fujitsu Limited | Bandwidth improvement for amplifiers |
JP2018014543A (ja) * | 2014-11-28 | 2018-01-25 | ソニー株式会社 | 増幅器 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03195108A (ja) * | 1989-12-22 | 1991-08-26 | Nec Corp | 半導体集積回路 |
JPH07235802A (ja) * | 1994-02-23 | 1995-09-05 | Nippon Telegr & Teleph Corp <Ntt> | 高周波スイッチ回路 |
JP2002135060A (ja) * | 2000-10-19 | 2002-05-10 | Matsushita Electric Ind Co Ltd | 電力増幅装置及び方法 |
JP2002185270A (ja) * | 2000-12-18 | 2002-06-28 | Matsushita Electric Ind Co Ltd | 電力増幅器および通信機器 |
JP2002271152A (ja) * | 2001-03-08 | 2002-09-20 | Matsushita Electric Ind Co Ltd | 電力増幅器及びこの電力増幅器を搭載した携帯電話機 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05206818A (ja) | 1992-01-28 | 1993-08-13 | Mitsubishi Electric Corp | 半導体スイッチ |
JP2848502B2 (ja) | 1992-04-24 | 1999-01-20 | 日本電信電話株式会社 | マイクロ波半導体スイッチ |
JPH06283938A (ja) | 1993-03-25 | 1994-10-07 | Mitsubishi Electric Corp | 増幅装置 |
US5862461A (en) * | 1995-08-31 | 1999-01-19 | Sony Corporation | Transmitting apparatus and method of adjusting gain of signal to be transmitted, and receiving apparatus and method of adjusting gain of received signal |
SE505202C2 (sv) * | 1995-10-04 | 1997-07-14 | Allgon Ab | Förbiledningsanordning i en förstärkarenhet |
JPH10126164A (ja) | 1996-10-18 | 1998-05-15 | Matsushita Electric Ind Co Ltd | 高効率電力増幅器 |
JP4166318B2 (ja) * | 1998-03-25 | 2008-10-15 | 松下電器産業株式会社 | 電力増幅器 |
JP3712909B2 (ja) | 1999-04-01 | 2005-11-02 | 日本電信電話株式会社 | 高出力電力増幅器 |
JP3853536B2 (ja) | 1999-04-26 | 2006-12-06 | 株式会社東芝 | チューナ |
JP4144113B2 (ja) | 1999-05-20 | 2008-09-03 | ソニー株式会社 | 低雑音増幅器回路 |
JP3790086B2 (ja) | 2000-03-23 | 2006-06-28 | 日本電信電話株式会社 | 高周波電力増幅器 |
JP2001345653A (ja) | 2000-06-05 | 2001-12-14 | Matsushita Electric Ind Co Ltd | 高周波切替回路 |
JP2002141752A (ja) | 2000-10-30 | 2002-05-17 | Matsushita Electric Ind Co Ltd | 電力増幅器 |
JP3820136B2 (ja) | 2000-11-14 | 2006-09-13 | 日本無線株式会社 | 電力増幅器の並列運転システム |
-
2002
- 2002-12-04 JP JP2002352664A patent/JP3951123B2/ja not_active Expired - Fee Related
-
2003
- 2003-12-03 US US10/537,470 patent/US7298215B2/en not_active Expired - Fee Related
- 2003-12-03 WO PCT/JP2003/015468 patent/WO2004051845A1/ja active Application Filing
- 2003-12-03 CN CNB2003801049392A patent/CN100448166C/zh not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03195108A (ja) * | 1989-12-22 | 1991-08-26 | Nec Corp | 半導体集積回路 |
JPH07235802A (ja) * | 1994-02-23 | 1995-09-05 | Nippon Telegr & Teleph Corp <Ntt> | 高周波スイッチ回路 |
JP2002135060A (ja) * | 2000-10-19 | 2002-05-10 | Matsushita Electric Ind Co Ltd | 電力増幅装置及び方法 |
JP2002185270A (ja) * | 2000-12-18 | 2002-06-28 | Matsushita Electric Ind Co Ltd | 電力増幅器および通信機器 |
JP2002271152A (ja) * | 2001-03-08 | 2002-09-20 | Matsushita Electric Ind Co Ltd | 電力増幅器及びこの電力増幅器を搭載した携帯電話機 |
Also Published As
Publication number | Publication date |
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JP2004187080A (ja) | 2004-07-02 |
CN1720658A (zh) | 2006-01-11 |
US7298215B2 (en) | 2007-11-20 |
US20060033573A1 (en) | 2006-02-16 |
JP3951123B2 (ja) | 2007-08-01 |
CN100448166C (zh) | 2008-12-31 |
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