WO1992004765A3 - Frequency modulated synthesizer using low frequency offset mixed vco - Google Patents

Frequency modulated synthesizer using low frequency offset mixed vco Download PDF

Info

Publication number
WO1992004765A3
WO1992004765A3 PCT/US1991/005837 US9105837W WO9204765A3 WO 1992004765 A3 WO1992004765 A3 WO 1992004765A3 US 9105837 W US9105837 W US 9105837W WO 9204765 A3 WO9204765 A3 WO 9204765A3
Authority
WO
WIPO (PCT)
Prior art keywords
vco
mixer
frequency
synthesizer
offset
Prior art date
Application number
PCT/US1991/005837
Other languages
French (fr)
Other versions
WO1992004765A2 (en
Inventor
Joseph P Heck
Original Assignee
Motorola Inc
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 Motorola Inc filed Critical Motorola Inc
Priority to EP91917054A priority Critical patent/EP0546088B1/en
Priority to DE69128886T priority patent/DE69128886T2/en
Publication of WO1992004765A2 publication Critical patent/WO1992004765A2/en
Publication of WO1992004765A3 publication Critical patent/WO1992004765A3/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/02—Details
    • H03C3/09—Modifications of modulator for regulating the mean frequency
    • H03C3/0908—Modifications of modulator for regulating the mean frequency using a phase locked loop
    • H03C3/0983—Modifications of modulator for regulating the mean frequency using a phase locked loop containing in the loop a mixer other than for phase detection
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/02—Details
    • H03C3/09—Modifications of modulator for regulating the mean frequency
    • H03C3/0908—Modifications of modulator for regulating the mean frequency using a phase locked loop
    • H03C3/0975—Modifications of modulator for regulating the mean frequency using a phase locked loop applying frequency modulation in the phase locked loop at components other than the divider, the voltage controlled oscillator or the reference clock

Abstract

An improved frequency synthesizer 100 capable of producing true DC frequency modulation without the need to DC frequency modulate the reference oscillator. The synthesizer 100 includes a phase comparator 104 compares the reference signal 102 and the feedback signal 112. The output of said phase comparator 104 filtered and coupled to the main VCO 108. A balanced image mixer 200 mixes the two signals from the main VCO 108 and an offset VCO 300. The offset VCO 300 is a low frequency (e.g. 100 to 300 KHz) integrated offset VCO 308 whose center frequency is controlled accurately, by means of matching to a VCO 306 which is controlled by a feedback loop, and by using an image balanced mixer 200 to reduce the image response to substantially reduce or eliminate the filtering required at the mixer output. The configuration of the offset mixer within the synthesizer loop, any residual spurious content due to imperfect image balance or carrier feedthrough of the mixer is attenuated by the loop response. The output signal of the mixer 200 is looped back to the phase comparator 104 after being divided by N through a divider 114.
PCT/US1991/005837 1990-08-29 1991-08-16 Frequency modulated synthesizer using low frequency offset mixed vco WO1992004765A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP91917054A EP0546088B1 (en) 1990-08-29 1991-08-16 Frequency modulated synthesizer using low frequency offset mixed vco
DE69128886T DE69128886T2 (en) 1990-08-29 1991-08-16 FREQUENCY MODULATED SYNTHESISER WITH LOW FREQUENCY OFFSET MIXED VCO

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US574,626 1990-08-29
US07/574,626 US5079526A (en) 1990-08-29 1990-08-29 Frequency modulated synthesizer using low frequency offset mixed VCO

Publications (2)

Publication Number Publication Date
WO1992004765A2 WO1992004765A2 (en) 1992-03-19
WO1992004765A3 true WO1992004765A3 (en) 1992-04-16

Family

ID=24296929

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1991/005837 WO1992004765A2 (en) 1990-08-29 1991-08-16 Frequency modulated synthesizer using low frequency offset mixed vco

Country Status (7)

Country Link
US (1) US5079526A (en)
EP (1) EP0546088B1 (en)
JP (1) JPH06500443A (en)
AT (1) ATE163110T1 (en)
CA (1) CA2087719C (en)
DE (1) DE69128886T2 (en)
WO (1) WO1992004765A2 (en)

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JPH05207326A (en) * 1992-01-28 1993-08-13 Matsushita Electric Ind Co Ltd Horizontal compression pll circuit
WO1994003981A1 (en) * 1992-08-06 1994-02-17 Motorola Inc. Radio having a combined pll and afc loop and method of operating the same
US5313173A (en) * 1993-04-26 1994-05-17 Ericsson Ge Mobile Communications Inc. Quadrature modulated phase-locked loop
US5550865A (en) * 1993-05-05 1996-08-27 National Semiconductor Corporation Frequency modulator for data transceiver
DE69428153T2 (en) * 1993-05-19 2002-06-06 Koninkl Philips Electronics Nv Bit clock recovery for CPFSK signals
US5511236A (en) * 1993-12-07 1996-04-23 National Semiconductor Corporation Half duplex RF transceiver
US5584062A (en) * 1994-01-24 1996-12-10 Motorola, Inc. Method and apparatus for compensating phase locked receivers
EP0857388A4 (en) * 1995-10-23 2002-01-02 Momentum Microsystems Inc Broadband, low power fm/fsk transceiver for wireless communications systems
US5737694A (en) * 1995-11-30 1998-04-07 Scientific-Atlanta, Inc. Highly stable frequency synthesizer loop with feedforward
GB2320629B (en) * 1996-12-23 2001-04-25 Nokia Mobile Phones Ltd A radio transmitter and phase locked loop therefor
US6633550B1 (en) * 1997-02-20 2003-10-14 Telefonaktiebolaget Lm Ericsson (Publ) Radio transceiver on a chip
US5894592A (en) * 1997-04-17 1999-04-13 Motorala, Inc. Wideband frequency synthesizer for direct conversion transceiver
US6157260A (en) * 1999-03-02 2000-12-05 Motorola, Inc. Method and apparatus for calibrating a local oscillator in a direct conversion receiver
US6114980A (en) 1999-04-13 2000-09-05 Motorola, Inc. Method and apparatus for settling a DC offset
US6317064B1 (en) 2000-02-29 2001-11-13 Motorola, Inc. DC offset correction adaptable to multiple requirements
US6418303B1 (en) 2000-02-29 2002-07-09 Motorola, Inc. Fast attack automatic gain control (AGC) loop and methodology for narrow band receivers
US6459889B1 (en) 2000-02-29 2002-10-01 Motorola, Inc. DC offset correction loop for radio receiver
US6356217B1 (en) 2000-02-29 2002-03-12 Motorola, Inc. Enhanced DC offset correction through bandwidth and clock speed selection
US6268780B1 (en) 2000-04-26 2001-07-31 National Semiconductor Corporation Frequency synthesizer with digital frequency lock loop
US6654594B1 (en) 2000-05-30 2003-11-25 Motorola, Inc. Digitized automatic gain control system and methods for a controlled gain receiver
FI113424B (en) * 2000-12-22 2004-04-15 Nokia Corp System and method for a direct conversion receiver, in particular a GPS receiver system with high pass filtering
DE10142019A1 (en) * 2001-08-28 2003-03-20 Philips Corp Intellectual Pty Circuit arrangement for demodulating signals
DE10223396B4 (en) * 2002-05-25 2005-08-04 Diehl Ako Stiftung & Co. Kg Input circuit for an RF transmission block
DE10253719B4 (en) * 2002-11-19 2008-04-24 Newlogic Technologies Gmbh Phase Locked Loop with digitally controlled frequency fine tuning
US7580691B1 (en) * 2005-08-02 2009-08-25 Rf Micro Devices, Inc. System and method for reducing self interference
RU2320076C1 (en) * 2007-03-02 2008-03-20 Андрей Витальевич Паргачёв Method for composing modulated radio-signal which does not contain side spectrums and harmonics

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4610030A (en) * 1983-11-04 1986-09-02 Thomson-Lgt Frequency modulated transmitter applicable to MF broadcasting
US4837853A (en) * 1987-06-05 1989-06-06 Motorola, Inc. Dual port FM demodulation in phase locked receivers
US4882549A (en) * 1988-11-16 1989-11-21 Zvi Galani Center offset microwave frequency synthesizer
US4912432A (en) * 1989-04-17 1990-03-27 Raytheon Company Plural feedback loop digital frequency synthesizer

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
US4131861A (en) * 1977-12-30 1978-12-26 International Business Machines Corporation Variable frequency oscillator system including two matched oscillators controlled by a phase locked loop
JPS5854708A (en) * 1981-09-28 1983-03-31 Nec Corp Radio transmitter
JPS58143631A (en) * 1982-02-19 1983-08-26 Sony Corp Pll synthesizer circuit
US4540958A (en) * 1983-09-30 1985-09-10 International Telephone And Telegraph Corporation Zero if frequency-modulator
GB2183946A (en) * 1985-12-06 1987-06-10 Plessey Co Plc Frequency synthesiser
JPH0242818A (en) * 1988-08-02 1990-02-13 Fujitsu General Ltd Stabilized voltage controlled oscillator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4610030A (en) * 1983-11-04 1986-09-02 Thomson-Lgt Frequency modulated transmitter applicable to MF broadcasting
US4837853A (en) * 1987-06-05 1989-06-06 Motorola, Inc. Dual port FM demodulation in phase locked receivers
US4882549A (en) * 1988-11-16 1989-11-21 Zvi Galani Center offset microwave frequency synthesizer
US4912432A (en) * 1989-04-17 1990-03-27 Raytheon Company Plural feedback loop digital frequency synthesizer

Also Published As

Publication number Publication date
EP0546088A4 (en) 1993-09-29
EP0546088A1 (en) 1993-06-16
CA2087719A1 (en) 1992-03-01
JPH06500443A (en) 1994-01-13
DE69128886T2 (en) 1998-09-10
EP0546088B1 (en) 1998-02-04
US5079526A (en) 1992-01-07
CA2087719C (en) 1995-04-11
DE69128886D1 (en) 1998-03-12
WO1992004765A2 (en) 1992-03-19
ATE163110T1 (en) 1998-02-15

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