GB1526928A - Frequency synthesisers - Google Patents

Frequency synthesisers

Info

Publication number
GB1526928A
GB1526928A GB4748474A GB4748474A GB1526928A GB 1526928 A GB1526928 A GB 1526928A GB 4748474 A GB4748474 A GB 4748474A GB 4748474 A GB4748474 A GB 4748474A GB 1526928 A GB1526928 A GB 1526928A
Authority
GB
United Kingdom
Prior art keywords
oscillator
frequency
output
input
signal
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
GB4748474A
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.)
Plessey Co Ltd
Original Assignee
Plessey Co Ltd
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 Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB4748474A priority Critical patent/GB1526928A/en
Publication of GB1526928A publication Critical patent/GB1526928A/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
    • H03L7/16—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
    • 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
    • H03L7/113—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using frequency discriminator

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

1526928 Automatic frequency control PLESSEY CO Ltd 31 Oct 1975 [2 Nov 1974] 47484/74 Heading H3A A frequency synthesizer comprises: a phase comparator 15 to one input of which is applied a reference signal 14 and to the other input of which a controlled oscillator 11 is coupled via a divider 12, 13, the output of the comparator being applied as a control signal to the oscillator 11; and a frequency discriminator 17 also fed with a signal derived from the output from oscillator 11 to provide a second, faster acting control signal from the oscillator. As shown in Fig. 2, both control signals are applied to the oscillator 11 via a common low pass filter so that both controls extend down to zero frequency. Alternatively, Fig. 1 (not shown), the frequency discriminator output may be applied through a separate bandpass filter (10). Frequency modulation may be applied at point X.
GB4748474A 1975-10-31 1975-10-31 Frequency synthesisers Expired GB1526928A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4748474A GB1526928A (en) 1975-10-31 1975-10-31 Frequency synthesisers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4748474A GB1526928A (en) 1975-10-31 1975-10-31 Frequency synthesisers

Publications (1)

Publication Number Publication Date
GB1526928A true GB1526928A (en) 1978-10-04

Family

ID=10445155

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4748474A Expired GB1526928A (en) 1975-10-31 1975-10-31 Frequency synthesisers

Country Status (1)

Country Link
GB (1) GB1526928A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4409563A (en) * 1981-02-26 1983-10-11 General Electric Company Phase locked loop frequency synthesizer with frequency compression loop
EP1710916A1 (en) * 2005-04-07 2006-10-11 Stmicroelectronics Sa Phase-locked loop

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4409563A (en) * 1981-02-26 1983-10-11 General Electric Company Phase locked loop frequency synthesizer with frequency compression loop
EP1710916A1 (en) * 2005-04-07 2006-10-11 Stmicroelectronics Sa Phase-locked loop
FR2884372A1 (en) * 2005-04-07 2006-10-13 St Microelectronics Sa PHASE STACK LOOP
US7315214B2 (en) 2005-04-07 2008-01-01 Stmicroelectronics S.A. Phase locked loop

Similar Documents

Publication Publication Date Title
ES487141A1 (en) Digital phase control circuit with auxiliary circuit.
GB1448712A (en) Digital speed control
ES421933A1 (en) Phase locked loop transmitter
GB1526928A (en) Frequency synthesisers
GB1393124A (en) Frequency synthesiser
JPS56154860A (en) Detection system for frequency difference signal
JPS56154859A (en) Carrier wave regenerating circuit
IE45589L (en) High frequency oscillator
JPS5651128A (en) Pll
JPS57162526A (en) Phase synchronizing circuit
GB1520290A (en) Phase acquisition
GB1191433A (en) Improvements in or relating to Frequency Synthesisers.
GB1161205A (en) Improvements in or relating to Frequency Synthesiser Arrangements.
GB1211971A (en) Frequency synthesizer apparatus
JPS57189587A (en) Controlling circuit for motor
JPS5449054A (en) Frequency synthesizer
GB1413608A (en) Phase-controlled oscillator circuit
SE7706449L (en) TRANSMITTER RECEIVER, SPECIAL FOR RADIOELECTRIC DISTANCE SATURATION
JPS57190413A (en) Receiver
JPS57101447A (en) Clock phase lock circuit
GB1041716A (en) Automatic frequency and phase control system
GB1046558A (en) Improvements in of relating to apparatus for comparing the amplitudes of two input signals of different frequencies
JPS57162841A (en) Digital pll circuit system
JPS5249711A (en) Synthesizer tuner
JPS55633A (en) Receiving unit

Legal Events

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