JPS5464956A - Pll circuit - Google Patents

Pll circuit

Info

Publication number
JPS5464956A
JPS5464956A JP13178377A JP13178377A JPS5464956A JP S5464956 A JPS5464956 A JP S5464956A JP 13178377 A JP13178377 A JP 13178377A JP 13178377 A JP13178377 A JP 13178377A JP S5464956 A JPS5464956 A JP S5464956A
Authority
JP
Japan
Prior art keywords
output
frequency
divider
voltage
circuit
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.)
Granted
Application number
JP13178377A
Other languages
Japanese (ja)
Other versions
JPS5761216B2 (en
Inventor
Shigeo Takada
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP13178377A priority Critical patent/JPS5464956A/en
Publication of JPS5464956A publication Critical patent/JPS5464956A/en
Publication of JPS5761216B2 publication Critical patent/JPS5761216B2/ja
Granted 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 secure the output frequency over a wide range by adding the divider circuit to divide the output of the voltage control oscillator and the switch circuit to select the oscillation output or the division output in accordance with the output of the low pass filter at the front step of the oscillator to the PLL circuit. CONSTITUTION:The output of phase comparator 1 is changed to DC through low pass filter 2, and voltage control oscillator 3 is actuated according to the DC output voltage or the DC output voltage obtained by amplifying the first DC output voltage. Oscillation frequency fv obtained through oscillator 3 is used as output frequency fo of this system, and at the same time output frequency fo/N of divider 4 which is capable of program with optional integer N is compared with input reference frequency fR through comparator 1. In such constitution, divider 21 which features division number M1 and divides frequency fv and divider 22 of division number M2 are provided in series, and these output frequency fv/M1 and fv M2 are selected through selection switch circuit 23 to be applied to divider 4. Switch 24 of circuit 23 is controlled by output DC voltage Vin of filter 2.
JP13178377A 1977-11-02 1977-11-02 Pll circuit Granted JPS5464956A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13178377A JPS5464956A (en) 1977-11-02 1977-11-02 Pll circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13178377A JPS5464956A (en) 1977-11-02 1977-11-02 Pll circuit

Publications (2)

Publication Number Publication Date
JPS5464956A true JPS5464956A (en) 1979-05-25
JPS5761216B2 JPS5761216B2 (en) 1982-12-23

Family

ID=15066035

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13178377A Granted JPS5464956A (en) 1977-11-02 1977-11-02 Pll circuit

Country Status (1)

Country Link
JP (1) JPS5464956A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5825724A (en) * 1981-07-24 1983-02-16 トムソン−セ−エスエフ Wide band frequency synthesizer
JPH02268519A (en) * 1989-03-17 1990-11-02 Icom Inc Pll frequency synthesizer
JP2001177396A (en) * 1999-11-13 2001-06-29 Koninkl Philips Electronics Nv Electrical communication apparatus including clock generating unit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5825724A (en) * 1981-07-24 1983-02-16 トムソン−セ−エスエフ Wide band frequency synthesizer
JPH02268519A (en) * 1989-03-17 1990-11-02 Icom Inc Pll frequency synthesizer
JP2001177396A (en) * 1999-11-13 2001-06-29 Koninkl Philips Electronics Nv Electrical communication apparatus including clock generating unit

Also Published As

Publication number Publication date
JPS5761216B2 (en) 1982-12-23

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