AU2001248317A1 - Improved fractional-n phase locked loop - Google Patents

Improved fractional-n phase locked loop

Info

Publication number
AU2001248317A1
AU2001248317A1 AU2001248317A AU4831701A AU2001248317A1 AU 2001248317 A1 AU2001248317 A1 AU 2001248317A1 AU 2001248317 A AU2001248317 A AU 2001248317A AU 4831701 A AU4831701 A AU 4831701A AU 2001248317 A1 AU2001248317 A1 AU 2001248317A1
Authority
AU
Australia
Prior art keywords
signal
phase
locked loop
frequency
phase difference
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.)
Abandoned
Application number
AU2001248317A
Inventor
Hans Hagberg
Magnus Nilsson
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of AU2001248317A1 publication Critical patent/AU2001248317A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D13/00—Circuits for comparing the phase or frequency of two mutually-independent oscillations
    • H03D13/003—Circuits for comparing the phase or frequency of two mutually-independent oscillations in which both oscillations are converted by logic means into pulses which are applied to filtering or integrating means
    • H03D13/004—Circuits for comparing the phase or frequency of two mutually-independent oscillations in which both oscillations are converted by logic means into pulses which are applied to filtering or integrating means the logic means delivering pulses at more than one terminal, e.g. up and down pulses
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K23/00—Pulse counters comprising counting chains; Frequency dividers comprising counting chains
    • H03K23/64—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two
    • H03K23/66—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two with a variable counting base, e.g. by presetting or by adding or suppressing pulses
    • H03K23/667—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two with a variable counting base, e.g. by presetting or by adding or suppressing pulses by switching the base during a counting cycle
    • 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
    • H03L7/08—Details of the phase-locked loop
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
    • H03L7/089—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector generating up-down pulses
    • H03L7/0891—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector generating up-down pulses the up-down pulses controlling source and sink current generators, e.g. a charge pump

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Manipulation Of Pulses (AREA)
  • Oscillators With Electromechanical Resonators (AREA)

Abstract

A phase-locked loop has a phase detector that generates a phase difference signal, a circuit that generates a phase-locked loop output signal having a frequency that is a function of the phase difference signal, a frequency divider that receives the phase-locked loop output signal and generates therefrom a divided frequency signal. To substantially reduce variation in the duty cycle of the divided frequency signal, a comparison signal having one half the frequency of the divided frequency signal is generated. This may be performed by configuring a latch to toggle its output state once for every cycle of the divided frequency signal. To compensate for the additional division by two in the feedback path, the phase detector may use a dual-edge triggered latch to generate the phase difference signal so that it represents a phase difference between the reference signal and a signal having twice the frequency of the comparison signal.
AU2001248317A 2000-02-29 2001-02-28 Improved fractional-n phase locked loop Abandoned AU2001248317A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US18568100P 2000-02-29 2000-02-29
US60185681 2000-02-29
US09580119 2000-05-30
US09/580,119 US6959063B1 (en) 2000-02-29 2000-05-30 Fractional-N phase locked loop
PCT/EP2001/002200 WO2001065681A2 (en) 2000-02-29 2001-02-28 Fractional-phase locked loop

Publications (1)

Publication Number Publication Date
AU2001248317A1 true AU2001248317A1 (en) 2001-09-12

Family

ID=26881359

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2001248317A Abandoned AU2001248317A1 (en) 2000-02-29 2001-02-28 Improved fractional-n phase locked loop

Country Status (8)

Country Link
US (1) US6959063B1 (en)
EP (1) EP1262016B1 (en)
JP (1) JP4713050B2 (en)
AT (1) ATE251359T1 (en)
AU (1) AU2001248317A1 (en)
DE (1) DE60100896T2 (en)
MY (1) MY124523A (en)
WO (1) WO2001065681A2 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1289150A1 (en) * 2001-08-24 2003-03-05 STMicroelectronics S.r.l. A process for generating a variable frequency signal, for instance for spreading the spectrum of a clock signal, and device therefor
US7535977B2 (en) * 2004-09-30 2009-05-19 Gct Semiconductor, Inc. Sigma-delta based phase lock loop
US7876871B2 (en) * 2006-11-30 2011-01-25 Qualcomm Incorporated Linear phase frequency detector and charge pump for phase-locked loop
US8401140B2 (en) * 2008-09-05 2013-03-19 Freescale Semiconductor, Inc. Phase/frequency detector for a phase-locked loop that samples on both rising and falling edges of a reference signal
CN101399540B (en) * 2008-10-10 2010-06-23 东南大学 High speed wide range multi-mode programmable frequency divider with 50% duty ratio
WO2012103090A1 (en) * 2011-01-28 2012-08-02 Coherent Logix, Incorporated Frequency divider with synchronous range extension across octave boundaries
JP7393079B2 (en) * 2019-03-26 2023-12-06 ラピスセミコンダクタ株式会社 semiconductor equipment
CN116647233B (en) * 2023-05-18 2024-04-02 成都电科星拓科技有限公司 Multimode frequency divider, phase-locked loop and chip for reducing phase difference of different frequency division ratios

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9500491A (en) * 1994-12-15 1996-02-01 Ericsson Radio Systems Bv Phase-locked loop for rectangular waveform signals.
JPH08213900A (en) * 1995-02-07 1996-08-20 Oki Electric Ind Co Ltd Phase comparator circuit and pll circuit using the phase comparator circuit
JP3281817B2 (en) * 1995-09-28 2002-05-13 三洋電機株式会社 Variable frequency divider
EP0766403B1 (en) 1995-09-28 2003-12-10 Sanyo Electric Co. Ltd Variable frequency divider
JP3459561B2 (en) * 1998-02-10 2003-10-20 三洋電機株式会社 Phase comparator
GB2335322B (en) 1998-03-13 2002-04-24 Ericsson Telefon Ab L M Phase detector

Also Published As

Publication number Publication date
WO2001065681A2 (en) 2001-09-07
EP1262016B1 (en) 2003-10-01
ATE251359T1 (en) 2003-10-15
JP2003526239A (en) 2003-09-02
MY124523A (en) 2006-06-30
EP1262016A2 (en) 2002-12-04
JP4713050B2 (en) 2011-06-29
DE60100896D1 (en) 2003-11-06
DE60100896T2 (en) 2004-08-26
US6959063B1 (en) 2005-10-25
WO2001065681A3 (en) 2002-01-03

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