GB2025171B - Phase locked loops - Google Patents

Phase locked loops

Info

Publication number
GB2025171B
GB2025171B GB7911567A GB7911567A GB2025171B GB 2025171 B GB2025171 B GB 2025171B GB 7911567 A GB7911567 A GB 7911567A GB 7911567 A GB7911567 A GB 7911567A GB 2025171 B GB2025171 B GB 2025171B
Authority
GB
United Kingdom
Prior art keywords
phase locked
locked loops
loops
phase
locked
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.)
Expired
Application number
GB7911567A
Other versions
GB2025171A (en
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.)
BRITISH COMMUNICATIONS EQUIPME
Original Assignee
BRITISH COMMUNICATIONS EQUIPME
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 BRITISH COMMUNICATIONS EQUIPME filed Critical BRITISH COMMUNICATIONS EQUIPME
Priority to GB7911567A priority Critical patent/GB2025171B/en
Publication of GB2025171A publication Critical patent/GB2025171A/en
Application granted granted Critical
Publication of GB2025171B publication Critical patent/GB2025171B/en
Expired 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
    • H03L7/08—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
    • H03L7/0893—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 the up-down pulses controlling at least two source current generators or at least two sink current generators connected to different points in the 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
    • H03L7/08—Details of the phase-locked loop
    • H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
    • H03L7/107—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth
    • H03L7/1075—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth by changing characteristics of the loop filter, e.g. changing the gain, changing the bandwidth
    • 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
    • H03L7/183—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 fixed numbers or the frequency divider dividing by a fixed number
    • H03L7/191—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 fixed numbers or the frequency divider dividing by a fixed number using at least two different signals from the frequency divider or the counter for determining the time difference
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L2207/00—Indexing scheme relating to automatic control of frequency or phase and to synchronisation
    • H03L2207/18—Temporarily disabling, deactivating or stopping the frequency counter or divider
GB7911567A 1978-04-28 1979-04-03 Phase locked loops Expired GB2025171B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7911567A GB2025171B (en) 1978-04-28 1979-04-03 Phase locked loops

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1702378 1978-04-28
GB7911567A GB2025171B (en) 1978-04-28 1979-04-03 Phase locked loops

Publications (2)

Publication Number Publication Date
GB2025171A GB2025171A (en) 1980-01-16
GB2025171B true GB2025171B (en) 1982-10-27

Family

ID=26252385

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7911567A Expired GB2025171B (en) 1978-04-28 1979-04-03 Phase locked loops

Country Status (1)

Country Link
GB (1) GB2025171B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1282464C (en) * 1985-10-23 1991-04-02 Masanori Ienaka Phase-locked oscillator
JP2984448B2 (en) * 1992-01-13 1999-11-29 日本電気株式会社 Frequency synthesizer

Also Published As

Publication number Publication date
GB2025171A (en) 1980-01-16

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee