CA2215376A1 - Direct digital synthesizer driven pll frequency synthesizer with clean-up pll - Google Patents

Direct digital synthesizer driven pll frequency synthesizer with clean-up pll

Info

Publication number
CA2215376A1
CA2215376A1 CA002215376A CA2215376A CA2215376A1 CA 2215376 A1 CA2215376 A1 CA 2215376A1 CA 002215376 A CA002215376 A CA 002215376A CA 2215376 A CA2215376 A CA 2215376A CA 2215376 A1 CA2215376 A1 CA 2215376A1
Authority
CA
Canada
Prior art keywords
pll
clean
synthesizer
dds
frequency
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
CA002215376A
Other languages
French (fr)
Other versions
CA2215376C (en
Inventor
Robert P. Gilmore
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.)
Qualcomm Inc
Original Assignee
Qualcomm Incorporated
Robert P. Gilmore
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 Qualcomm Incorporated, Robert P. Gilmore filed Critical Qualcomm Incorporated
Publication of CA2215376A1 publication Critical patent/CA2215376A1/en
Application granted granted Critical
Publication of CA2215376C publication Critical patent/CA2215376C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • H03L7/22—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop
    • 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
    • H03L7/22—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop
    • H03L7/23—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop with pulse counters or frequency dividers
    • 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
    • H03L7/1806—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 the frequency divider comprising a phase accumulator generating the frequency divided signal

Abstract

A frequency synthesizer (200) which uses a direct digital synthesizer (DDS) (204) to generate a highly accurate periodic signal.
The DDS (204) output signal is bandpass filtered utilizing a clean-up phase lock loop (PLL) (214) to produce a spectrally pure reference signal and promote overall fast settling time. A second or primary phase lock loop (220), having a much faster settling time than the first PLL (214), adjusts the frequency of the reference signal generated by the clean-up PLL (214). In one embodiment, the DDS frequency synthesizer (204) has a digital to analog converter (DAC) (206) coupled to the clean-up PLL (214). Another embodiment (300) feeds the most significant bit (MSB) (310) or overflow bit from the DAC accumulator (306) into the "clean-up" PLL (318). Yet another embodiment (400) uses a switching apparatus to bypass the "clean-up" PLL (410) while it is settling on a new frequency.
CA002215376A 1995-03-16 1996-03-08 Direct digital synthesizer driven pll frequency synthesizer with clean-up pll Expired - Fee Related CA2215376C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US40752195A 1995-03-16 1995-03-16
US08/407,521 1995-03-16
PCT/US1996/002559 WO1996028890A1 (en) 1995-03-16 1996-03-08 Direct digital synthesizer driven pll frequency synthesizer with clean-up pll

Publications (2)

Publication Number Publication Date
CA2215376A1 true CA2215376A1 (en) 1996-09-19
CA2215376C CA2215376C (en) 2006-07-11

Family

ID=23612420

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002215376A Expired - Fee Related CA2215376C (en) 1995-03-16 1996-03-08 Direct digital synthesizer driven pll frequency synthesizer with clean-up pll

Country Status (17)

Country Link
US (1) US5757239A (en)
EP (1) EP0815648B1 (en)
KR (1) KR100352681B1 (en)
CN (1) CN1098563C (en)
AT (1) ATE219612T1 (en)
AU (1) AU711590B2 (en)
BR (1) BR9607869A (en)
CA (1) CA2215376C (en)
DE (1) DE69621919T2 (en)
DK (1) DK0815648T3 (en)
ES (1) ES2179186T3 (en)
FI (1) FI115936B (en)
HK (1) HK1007916A1 (en)
MX (1) MX9706979A (en)
PT (1) PT815648E (en)
RU (1) RU2176431C2 (en)
WO (1) WO1996028890A1 (en)

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Also Published As

Publication number Publication date
DE69621919T2 (en) 2003-02-13
CN1178613A (en) 1998-04-08
AU5298596A (en) 1996-10-02
EP0815648A1 (en) 1998-01-07
DK0815648T3 (en) 2002-07-15
FI973654A0 (en) 1997-09-10
AU711590B2 (en) 1999-10-14
CA2215376C (en) 2006-07-11
US5757239A (en) 1998-05-26
KR19980703044A (en) 1998-09-05
KR100352681B1 (en) 2002-11-18
ES2179186T3 (en) 2003-01-16
BR9607869A (en) 1998-07-14
DE69621919D1 (en) 2002-07-25
WO1996028890A1 (en) 1996-09-19
HK1007916A1 (en) 1999-04-30
PT815648E (en) 2002-09-30
MX9706979A (en) 1997-12-31
RU2176431C2 (en) 2001-11-27
FI115936B (en) 2005-08-15
EP0815648B1 (en) 2002-06-19
CN1098563C (en) 2003-01-08
ATE219612T1 (en) 2002-07-15
FI973654A (en) 1997-11-14

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