JPS5483752A - Pll frequency synthesizer system - Google Patents

Pll frequency synthesizer system

Info

Publication number
JPS5483752A
JPS5483752A JP15204577A JP15204577A JPS5483752A JP S5483752 A JPS5483752 A JP S5483752A JP 15204577 A JP15204577 A JP 15204577A JP 15204577 A JP15204577 A JP 15204577A JP S5483752 A JPS5483752 A JP S5483752A
Authority
JP
Japan
Prior art keywords
variation
ratio
frequency
lock
fvco
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
JP15204577A
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 JP15204577A priority Critical patent/JPS5483752A/en
Publication of JPS5483752A publication Critical patent/JPS5483752A/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
    • H03L7/18—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

Landscapes

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

Abstract

PURPOSE:To improve a CN ratio, lock-up time, etc., by causing variation in the step of comparative signal fral/N to occur to a voltage control oscillator by multiplying the signal a programmable counter by N. CONSTITUTION:Between programmable counter 8 and phase comparator 9, N- multiplier circuit 11 is interposed to set oscillation frequency (fvco) of voltage control oscillator 7 P/N-times as much as comparative frequency (fr) (P is the dividing ratio of counter 8, and N is a fixed number). Since changing P into (+1) cause variation DELTAfvco=1/N.fr, i.e variation of oscillation frequency fvco in step 1/N.fr, (fr) is set to (Nx100) in order to obtain the variation in a step of, for example, 100Hz. For example, when N=10 is selected, (fr) is lKNz and the cut-off frequency of LPF10 can be increased, so that the CN ratio, lock-up time, stability of the PLL system can all be improved.
JP15204577A 1977-12-16 1977-12-16 Pll frequency synthesizer system Pending JPS5483752A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15204577A JPS5483752A (en) 1977-12-16 1977-12-16 Pll frequency synthesizer system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15204577A JPS5483752A (en) 1977-12-16 1977-12-16 Pll frequency synthesizer system

Publications (1)

Publication Number Publication Date
JPS5483752A true JPS5483752A (en) 1979-07-04

Family

ID=15531839

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15204577A Pending JPS5483752A (en) 1977-12-16 1977-12-16 Pll frequency synthesizer system

Country Status (1)

Country Link
JP (1) JPS5483752A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5732133A (en) * 1980-08-04 1982-02-20 Advantest Corp Phase-synchronous oscillator
JPS5794248U (en) * 1980-11-28 1982-06-10
JPS6243216A (en) * 1985-08-20 1987-02-25 Nec Corp Frequency synthesizer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5732133A (en) * 1980-08-04 1982-02-20 Advantest Corp Phase-synchronous oscillator
JPS5794248U (en) * 1980-11-28 1982-06-10
JPS6243216A (en) * 1985-08-20 1987-02-25 Nec Corp Frequency synthesizer

Similar Documents

Publication Publication Date Title
JPS5469018A (en) Color demodulator circuit
JPS57112137A (en) Frequency synthesizer
JPS5483752A (en) Pll frequency synthesizer system
JPS5227342A (en) Signal generator
JPS55130249A (en) Code synchronous system for reception of spectrum diffusion signal
JPS5212549A (en) Frequency synthesizer
JPS5464956A (en) Pll circuit
JPS5234663A (en) Frequency divider
JPS52151819A (en) Inverter device connected in parallel
JPS5335466A (en) Variable frequency oscillator circuit
JPS533765A (en) Phase synchronous oscillating unit
JPS5776930A (en) Frequency shift signal generating system using pll
JPS56122240A (en) Frequency setting device of frequency synthesizer
JPS52127737A (en) Oscillation circuit
JPS5568742A (en) Phase lock oscillator circuit
JPS55141833A (en) Phase locked loop circuit
JPS55140332A (en) Phase lock loop voltage control crystal oscillator type variable multiplier
JPS5530273A (en) Pll synthesizer
JPS5676640A (en) Receiver of frequency synthesizer system
JPS5249711A (en) Synthesizer tuner
JPS5481707A (en) Synthesizer receiver
JPS5483753A (en) Pll frequency synthesizer system
JPS5341194A (en) Output frequency control system for atomic oscillator
JPS5661833A (en) Phase synchronous oscillating circuit
JPS56105524A (en) Phase synchronizing device