JPS5776931A - Pll circuit - Google Patents

Pll circuit

Info

Publication number
JPS5776931A
JPS5776931A JP55152733A JP15273380A JPS5776931A JP S5776931 A JPS5776931 A JP S5776931A JP 55152733 A JP55152733 A JP 55152733A JP 15273380 A JP15273380 A JP 15273380A JP S5776931 A JPS5776931 A JP S5776931A
Authority
JP
Japan
Prior art keywords
voltage
control
output signal
output
smoothing
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
JP55152733A
Other languages
Japanese (ja)
Inventor
Michitaro Hayakawa
Minoru Okada
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.)
DKK Co Ltd
Original Assignee
Denki Kogyo 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 Denki Kogyo Co Ltd filed Critical Denki Kogyo Co Ltd
Priority to JP55152733A priority Critical patent/JPS5776931A/en
Publication of JPS5776931A publication Critical patent/JPS5776931A/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
    • H03L7/187—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 means for coarse tuning the voltage controlled oscillator of the loop

Landscapes

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

Abstract

PURPOSE:To control an output signal frequency in a wide range with control voltage less in the remaining reference frequency component, by providing a means superimposing mother DC voltage on a DC voltage obtained through smoothing an output signal of a phase comparator. CONSTITUTION:An output of a programmable divider 2 and an output of reference frequency generator 4 are compared with each other at a phase comparator 3, and this comparison output signal is inputted to a low-pass filter 5. Another DC voltage is superimposed on a DC voltage obtained from smoothing with an LPF5 by a DC bias circuit 7 to obtain a control signal of a voltage-controlled oscillator 1. In a bias circuit 7, a plurality of variable resistors VR1-VR3 are connected in parallel with a DC power supply E, and a slider of each variable resistor is selectively connected to the voltage-controlled oscillator 1 via a switch SW, and a control voltage can be obtained by interlocking the switch SW with a program switching operation to the programmable divider 2.
JP55152733A 1980-10-30 1980-10-30 Pll circuit Pending JPS5776931A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55152733A JPS5776931A (en) 1980-10-30 1980-10-30 Pll circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55152733A JPS5776931A (en) 1980-10-30 1980-10-30 Pll circuit

Publications (1)

Publication Number Publication Date
JPS5776931A true JPS5776931A (en) 1982-05-14

Family

ID=15546966

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55152733A Pending JPS5776931A (en) 1980-10-30 1980-10-30 Pll circuit

Country Status (1)

Country Link
JP (1) JPS5776931A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0276907A2 (en) * 1987-01-29 1988-08-03 Ing. C. Olivetti & C., S.p.A. Circuit for regulating a voltage controlled oscillator
FR2614482A1 (en) * 1987-04-24 1988-10-28 Thomson Semiconducteurs MULTI-REFERENCE FREQUENCY GENERATOR
EP0896434A1 (en) * 1997-08-07 1999-02-10 Nec Corporation Phase locked loop circuit
WO2002027914A3 (en) * 2000-09-29 2002-07-25 Broadcom Corp Multi-frequency band controlled oscillator

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5533554B2 (en) * 1974-12-27 1980-09-01

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5533554B2 (en) * 1974-12-27 1980-09-01

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0276907A2 (en) * 1987-01-29 1988-08-03 Ing. C. Olivetti & C., S.p.A. Circuit for regulating a voltage controlled oscillator
FR2614482A1 (en) * 1987-04-24 1988-10-28 Thomson Semiconducteurs MULTI-REFERENCE FREQUENCY GENERATOR
EP0896434A1 (en) * 1997-08-07 1999-02-10 Nec Corporation Phase locked loop circuit
US6084480A (en) * 1997-08-07 2000-07-04 Nec Corporation Phase locked loop circuit including voltage controlled oscillator and low pass filter
WO2002027914A3 (en) * 2000-09-29 2002-07-25 Broadcom Corp Multi-frequency band controlled oscillator
US6650196B2 (en) 2000-09-29 2003-11-18 Broadcom Corporation Multi-frequency band controlled oscillator

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