CA2003428A1 - Frequency synthesizer - Google Patents

Frequency synthesizer

Info

Publication number
CA2003428A1
CA2003428A1 CA2003428A CA2003428A CA2003428A1 CA 2003428 A1 CA2003428 A1 CA 2003428A1 CA 2003428 A CA2003428 A CA 2003428A CA 2003428 A CA2003428 A CA 2003428A CA 2003428 A1 CA2003428 A1 CA 2003428A1
Authority
CA
Canada
Prior art keywords
control signal
frequency
phase
signal
dependence
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
CA2003428A
Other languages
French (fr)
Other versions
CA2003428C (en
Inventor
Thomas Atkin Denning Riley
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.)
Nortel Networks Ltd
Original Assignee
Carleton University
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 Carleton University filed Critical Carleton University
Priority to CA002003428A priority Critical patent/CA2003428C/en
Priority to EP90916673A priority patent/EP0501991A1/en
Priority to JP2515269A priority patent/JP2981922B2/en
Priority to AU66406/90A priority patent/AU6640690A/en
Priority to PCT/CA1990/000397 priority patent/WO1991007824A1/en
Publication of CA2003428A1 publication Critical patent/CA2003428A1/en
Application granted granted Critical
Publication of CA2003428C publication Critical patent/CA2003428C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B19/00—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
    • H03L7/197—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between numbers which are variable in time or the frequency divider dividing by a factor variable in time, e.g. for obtaining fractional frequency division
    • H03L7/1974—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between numbers which are variable in time or the frequency divider dividing by a factor variable in time, e.g. for obtaining fractional frequency division for fractional frequency division
    • H03L7/1976—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between numbers which are variable in time or the frequency divider dividing by a factor variable in time, e.g. for obtaining fractional frequency division for fractional frequency division using a phase accumulator for controlling the counter or frequency divider

Abstract

An indirect frequency synthesizer suitable for use in a cellular radio system has finer resolution and reduced spurious frequencies and/or phase noise, which facilitates a large number of channels in a given bandwidth. The synthesizer comprises a phase detector responsive to a reference signal and a phase control signal for generating a control signal that varies in dependence upon the phase difference between the reference signal and the phase control signal. A voltage controlled oscillator responsive to the control signal generates an output signal whose frequency varies in dependence upon the control signal. A
variable modulus divider divides the output signal to provide the phase control signal. The variable modulus divider varies its division ratio in dependence upon a ratio control signal derived by a second or higher order sigma-delta modulator in response to a frequency control signal .delta..PHI. and to the phase control signal.
The sigma-delta modulator displaces any quantisation noise in the ratio control signal away from the frequency of the phase control signal and multiples thereof. A direct frequency synthesizer may be implemented by means of the same sigma-delta modulator and variable modulus divider, but arranged so that the reference frequency signal is applied to the input of the divider, which divides it directly to provide the desired output frequency.
CA002003428A 1989-11-21 1989-11-21 Frequency synthesizer Expired - Lifetime CA2003428C (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CA002003428A CA2003428C (en) 1989-11-21 1989-11-21 Frequency synthesizer
EP90916673A EP0501991A1 (en) 1989-11-21 1990-11-19 Frequency synthesizer
JP2515269A JP2981922B2 (en) 1989-11-21 1990-11-19 Frequency synthesizer
AU66406/90A AU6640690A (en) 1989-11-21 1990-11-19 Frequency synthesizer
PCT/CA1990/000397 WO1991007824A1 (en) 1989-11-21 1990-11-19 Frequency synthesizer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA002003428A CA2003428C (en) 1989-11-21 1989-11-21 Frequency synthesizer

Publications (2)

Publication Number Publication Date
CA2003428A1 true CA2003428A1 (en) 1991-05-21
CA2003428C CA2003428C (en) 1999-12-14

Family

ID=4143592

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002003428A Expired - Lifetime CA2003428C (en) 1989-11-21 1989-11-21 Frequency synthesizer

Country Status (5)

Country Link
EP (1) EP0501991A1 (en)
JP (1) JP2981922B2 (en)
AU (1) AU6640690A (en)
CA (1) CA2003428C (en)
WO (1) WO1991007824A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6236703B1 (en) 1998-03-31 2001-05-22 Philsar Semiconductor Inc. Fractional-N divider using a delta-sigma modulator
US9484950B1 (en) 2014-10-27 2016-11-01 Arrowhead Center, Inc. Hardware efficient digital signal processing for on-the-fly delta sigma bit stream linear operator and compressor circuits

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5055802A (en) * 1990-04-30 1991-10-08 Motorola, Inc. Multiaccumulator sigma-delta fractional-n synthesis
IT1252241B (en) * 1991-12-10 1995-06-05 Alcatel Italia METHOD AND SYSTEM FOR THE REDUCTION OF THE JITTER OF A PLL STRUCTURE (PHASE LOKED LOOP) CHARACTERIZED BY A RATIONAL RELATIONSHIP BETWEEN THE INPUT AND OUTPUT FREQUENCIES.
US5495206A (en) * 1993-10-29 1996-02-27 Motorola, Inc. Fractional N frequency synthesis with residual error correction and method thereof
US5943613A (en) * 1996-11-07 1999-08-24 Telefonaktiebolaget Lm Ericsson Method and apparatus for reducing standby current in communications equipment
EP0940922B1 (en) * 1998-03-03 2002-12-04 Motorola Semiconducteurs S.A. Frequency synthesiser
GB2335322B (en) * 1998-03-13 2002-04-24 Ericsson Telefon Ab L M Phase detector
EP0954105A1 (en) * 1998-04-29 1999-11-03 Siemens Aktiengesellschaft Phase locked loop with fractional division
US6708026B1 (en) 2000-01-11 2004-03-16 Ericsson Inc. Division based local oscillator for frequency synthesis
DE60215806T2 (en) 2001-06-15 2007-09-06 Analog Devices Inc., Norwood INTERPOLATOR WITH VARIABLE MODULE AND VARIABLE FREQUENCY SYNTHESIZER WITH INTERPOLATOR WITH VARIABLE MODULE
US7424271B2 (en) * 2003-12-04 2008-09-09 Via Technologies Inc. Multi-mode and multi-band RF transceiver and related communications method
US7706495B2 (en) 2004-03-12 2010-04-27 Panasonic Corporation Two-point frequency modulation apparatus

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2172759B (en) * 1985-02-21 1988-04-13 Plessey Co Plc Fractional-n frequency
US4758802A (en) * 1985-02-21 1988-07-19 Plessey Overseas Limited Fractional N synthesizer
DE3826006C1 (en) * 1988-07-30 1989-10-12 Wandel & Goltermann Gmbh & Co, 7412 Eningen, De
GB8907316D0 (en) * 1989-03-31 1989-09-13 Plessey Co Plc Fractional'n'synthesisers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6236703B1 (en) 1998-03-31 2001-05-22 Philsar Semiconductor Inc. Fractional-N divider using a delta-sigma modulator
US9484950B1 (en) 2014-10-27 2016-11-01 Arrowhead Center, Inc. Hardware efficient digital signal processing for on-the-fly delta sigma bit stream linear operator and compressor circuits

Also Published As

Publication number Publication date
WO1991007824A1 (en) 1991-05-30
EP0501991A1 (en) 1992-09-09
JPH05506338A (en) 1993-09-16
JP2981922B2 (en) 1999-11-22
CA2003428C (en) 1999-12-14
AU6640690A (en) 1991-06-13

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