CA2062010A1 - Logarithmic amplification circuit - Google Patents

Logarithmic amplification circuit

Info

Publication number
CA2062010A1
CA2062010A1 CA2062010A CA2062010A CA2062010A1 CA 2062010 A1 CA2062010 A1 CA 2062010A1 CA 2062010 A CA2062010 A CA 2062010A CA 2062010 A CA2062010 A CA 2062010A CA 2062010 A1 CA2062010 A1 CA 2062010A1
Authority
CA
Canada
Prior art keywords
transistors
emitter resistor
differential amplifier
differential
wave
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2062010A
Other languages
French (fr)
Other versions
CA2062010C (en
Inventor
Katsuji Kimura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Electronics Corp
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2062010A1 publication Critical patent/CA2062010A1/en
Application granted granted Critical
Publication of CA2062010C publication Critical patent/CA2062010C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/001—Volume compression or expansion in amplifiers without controlling loop
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/06—Volume compression or expansion in amplifiers having semiconductor devices

Landscapes

  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Amplifiers (AREA)

Abstract

A logarithmic amplification circuit is provided which comprises a differential amplifier, a full-wave rectifier including two half-wave rectifiers connected so as to have their input signals reverse in phase to each other and respectively receiving an input signal and output signal of said differential amplifier, and an adder for adding the output signals of said full-wave rectifier. It is preferable that each of the half-wave rectifiers forming said full-wave rectifier includes a differential transistor pair only one transistor of which has an emitter resistor. In this case, two sets of differential transistor pair of said two half-wave rectifiers are arranged so that the transistors each having an emitter resistor have their collectors connected with each other, the transistors not having an emitter resistor have their collectors connected with each other, one of an output signal and input signal of said differential amplifier is applied to the base of one of the transistors each having an emitter resistor and one of the transistors each not having an emitter resistor, the other of an output signal and input signal of said differential amplifier is applied to the base of the other of the transistors each having an emitter resistor and the other of the transistors each not having an emitter resistor, and the transistors of each pair are connected respectively to constant current sources. In the preferred embodiments of this invention, said differential amplifier is provided plurally in a series connection and the input signals or output signals of these plural differential amplifiers are inputted to a plurality of rectifiers in a respective manner.
CA002062010A 1991-02-28 1992-02-27 Logarithmic amplification circuit Expired - Fee Related CA2062010C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3057918A JP2995886B2 (en) 1991-02-28 1991-02-28 Logarithmic amplifier circuit
JP3-57918 1991-02-28

Publications (2)

Publication Number Publication Date
CA2062010A1 true CA2062010A1 (en) 1992-08-29
CA2062010C CA2062010C (en) 1997-04-22

Family

ID=13069380

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002062010A Expired - Fee Related CA2062010C (en) 1991-02-28 1992-02-27 Logarithmic amplification circuit

Country Status (7)

Country Link
US (1) US5561392A (en)
EP (1) EP0505751B1 (en)
JP (1) JP2995886B2 (en)
AU (1) AU651432B2 (en)
CA (1) CA2062010C (en)
DE (1) DE69232182T2 (en)
ES (1) ES2162790T3 (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2136066T3 (en) * 1991-05-23 1999-11-16 Nec Corp LOGARITHMIC AMPLIFIER OF INTERMEDIATE FREQUENCY.
JP2836452B2 (en) * 1993-07-14 1998-12-14 日本電気株式会社 Logarithmic amplifier circuit
US5489868A (en) * 1994-10-04 1996-02-06 Analog Devices, Inc. Detector cell for logarithmic amplifiers
JPH08330861A (en) * 1995-05-31 1996-12-13 Nec Corp Low-voltage operational transconductance amplifier
JP2778537B2 (en) * 1995-07-14 1998-07-23 日本電気株式会社 AGC amplifier
US5815039A (en) * 1995-07-21 1998-09-29 Nec Corporation Low-voltage bipolar OTA having a linearity in transconductance over a wide input voltage range
AU6572296A (en) * 1995-09-19 1997-03-27 Nec Corporation Bipolar operational transconductance amplifier
JP2874616B2 (en) * 1995-10-13 1999-03-24 日本電気株式会社 OTA and multiplier
JPH09219630A (en) * 1995-12-08 1997-08-19 Nec Corp Differential circuit
JPH09238032A (en) * 1996-02-29 1997-09-09 Nec Corp Ota and bipolar multiplier
DE19608861A1 (en) * 1996-03-07 1997-09-11 Philips Patentverwaltung Circuit arrangement with a logarithmic transfer function
US5920215A (en) * 1997-06-30 1999-07-06 Sun Microsystems, Inc. Time-to-charge converter circuit
US6166592A (en) * 1998-07-31 2000-12-26 Lucent Technologies Inc. Linear CMOS transconductor with rail-to-rail compliance
US5994959A (en) * 1998-12-18 1999-11-30 Maxim Integrated Products, Inc. Linearized amplifier core
US20050057298A1 (en) * 2003-09-16 2005-03-17 Kevin Gamble Demodulating logarithmic amplifier and method of amplification
US7002395B2 (en) * 2003-09-16 2006-02-21 Yuantonix, Inc. Demodulating logarithmic amplifier
US7417485B1 (en) * 2003-09-23 2008-08-26 Cypress Semiconductor Corporation Differential energy difference integrator
EP2713507B1 (en) 2012-10-01 2014-12-10 Nxp B.V. FET RF power detector

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1258499A (en) * 1986-06-04 1989-08-15 Katsuji Kimura Intermediate frequency amplification circuit capable of detecting a field strength with low electric power
JPH0622304B2 (en) * 1986-06-12 1994-03-23 日本電気株式会社 Logarithmic IF amplifier circuit
EP0331246B1 (en) * 1988-02-29 1994-01-19 Koninklijke Philips Electronics N.V. Logarithmic amplifier
NL8800510A (en) * 1988-02-29 1989-09-18 Philips Nv LINEAR AMPLIFY AND DEMODULATION OF AN AM-MODULATED SIGNAL AND INTEGRATED SEMICONDUCTOR ELEMENT THEREFOR.
US4990803A (en) * 1989-03-27 1991-02-05 Analog Devices, Inc. Logarithmic amplifier
JPH02265310A (en) * 1989-04-05 1990-10-30 Nec Corp Logarithmic compression amplifying circuit
JP2643516B2 (en) * 1990-02-01 1997-08-20 日本電気株式会社 Logarithmic amplifier circuit
US5070303A (en) * 1990-08-21 1991-12-03 Telefonaktiebolaget L M Ericsson Logarithmic amplifier/detector delay compensation
JP2687713B2 (en) * 1990-10-30 1997-12-08 日本電気株式会社 Logarithmic amplifier circuit
US5319267A (en) * 1991-01-24 1994-06-07 Nec Corporation Frequency doubling and mixing circuit
US5298811A (en) * 1992-08-03 1994-03-29 Analog Devices, Inc. Synchronous logarithmic amplifier

Also Published As

Publication number Publication date
AU1125892A (en) 1992-09-03
CA2062010C (en) 1997-04-22
EP0505751B1 (en) 2001-11-07
AU651432B2 (en) 1994-07-21
DE69232182D1 (en) 2001-12-13
EP0505751A2 (en) 1992-09-30
EP0505751A3 (en) 1993-03-17
DE69232182T2 (en) 2002-04-11
JP2995886B2 (en) 1999-12-27
ES2162790T3 (en) 2002-01-16
US5561392A (en) 1996-10-01
JPH04273708A (en) 1992-09-29

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Legal Events

Date Code Title Description
EEER Examination request
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