JPS5483754A - Pll frequency synthesizer system - Google Patents

Pll frequency synthesizer system

Info

Publication number
JPS5483754A
JPS5483754A JP15204777A JP15204777A JPS5483754A JP S5483754 A JPS5483754 A JP S5483754A JP 15204777 A JP15204777 A JP 15204777A JP 15204777 A JP15204777 A JP 15204777A JP S5483754 A JPS5483754 A JP S5483754A
Authority
JP
Japan
Prior art keywords
frequency
signal
phase
oscillator
variation
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.)
Pending
Application number
JP15204777A
Other languages
Japanese (ja)
Inventor
Yoshio Horiike
Toshiaki Inui
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP15204777A priority Critical patent/JPS5483754A/en
Publication of JPS5483754A publication Critical patent/JPS5483754A/en
Pending 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
    • 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

Landscapes

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

Abstract

PURPOSE:To improve a CN ratio, etc., by phase-comparing the difference frequency between a signal from a voltage control oscillator and a fixed frequency signal with the divided signal of a comparative signal and by controlling the voltage control oscillator by the phase error output. CONSTITUTION:A signal of frequency (fr) is divided by programmable counter 15 by M and phase-compared with the difference frequency from mixer 12, and local oscillation frequency fvco of voltage control oscillator 11 is controlled via LPF16 so that both frequencies will become equal each other. Therefore, fvco' is made to vary bit by bit through the variation of output frequency (f) of counter 15. For example, the variation in a step of 1KHz is caused by oscillator 7 for generating the 1st local oscillation frequency and the output of oscillator 11 is varied in a step of 100Hz till 1KHz. As a result, frequency fvco' varies in a step of 100Hz by variation DELTAM at dividing ratio M, and signals to be phase-compared 14 are within 10KHz + or - 500Hz, so that a CN ratio, etc., can be improved.
JP15204777A 1977-12-16 1977-12-16 Pll frequency synthesizer system Pending JPS5483754A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15204777A JPS5483754A (en) 1977-12-16 1977-12-16 Pll frequency synthesizer system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15204777A JPS5483754A (en) 1977-12-16 1977-12-16 Pll frequency synthesizer system

Publications (1)

Publication Number Publication Date
JPS5483754A true JPS5483754A (en) 1979-07-04

Family

ID=15531882

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15204777A Pending JPS5483754A (en) 1977-12-16 1977-12-16 Pll frequency synthesizer system

Country Status (1)

Country Link
JP (1) JPS5483754A (en)

Similar Documents

Publication Publication Date Title
EP0369660A3 (en) Microwave frequency synthesizer with a frequency offset generator
EP0147897A3 (en) Phase-locked loop capable of generating a plurality of stable frequency signals
GB1173203A (en) Improvements in or relating to Variable Frequency Crystal Stabilised Signal Generators
JPS57140034A (en) Phase synchronizing oscillator
JPS5483754A (en) Pll frequency synthesizer system
ES426500A1 (en) Frequency synthesizer having phase-locked loop including sample and hold circuit frequency converter
EP0206247A3 (en) Pll frequency synthesizer
JPS5333038A (en) Phase synchronizing oscillator
GR3005055T3 (en) Device for the generation of at least two different frequencies.
JPS533765A (en) Phase synchronous oscillating unit
JPS5776930A (en) Frequency shift signal generating system using pll
JPS5769927A (en) Pll synthesizer receiver
JPS55118234A (en) Fm receiver
JPS54122914A (en) Radio receiver of pll frequency synthesizer system
JPS5466757A (en) Pll system
JPS5483752A (en) Pll frequency synthesizer system
JPS54121610A (en) Pll circuit of radio receiver
JPS5732133A (en) Phase-synchronous oscillator
JPS5481707A (en) Synthesizer receiver
JPS5676640A (en) Receiver of frequency synthesizer system
JPS56169435A (en) Phase synchronization oscillator
JPS5619233A (en) Synthesizer tuner
JPS5784629A (en) Channel selection circuit
JPS5730425A (en) Channel selector
JPS5341194A (en) Output frequency control system for atomic oscillator