JPS57160227A - Frequency synthesizer - Google Patents

Frequency synthesizer

Info

Publication number
JPS57160227A
JPS57160227A JP56045611A JP4561181A JPS57160227A JP S57160227 A JPS57160227 A JP S57160227A JP 56045611 A JP56045611 A JP 56045611A JP 4561181 A JP4561181 A JP 4561181A JP S57160227 A JPS57160227 A JP S57160227A
Authority
JP
Japan
Prior art keywords
voltage
digital values
oscillator
channel
rom8
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
JP56045611A
Other languages
Japanese (ja)
Inventor
Yukio Murayama
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP56045611A priority Critical patent/JPS57160227A/en
Publication of JPS57160227A publication Critical patent/JPS57160227A/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
    • H03L7/189—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 comprising a D/A converter for generating a coarse tuning voltage
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L2207/00—Indexing scheme relating to automatic control of frequency or phase and to synchronisation
    • H03L2207/06—Phase locked loops with a controlled oscillator having at least two frequency control terminals

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE:To shorten a channel transition time by storing a memory with the digital values of the best preset voltages for respective channels of the radio, etc., and applying them to a voltage=controlled oscillator afte D/A conversion. CONSTITUTION:Digital values D1-Dn as channel information on the radio, etc., are inputted to a P-ROM8 and a program counter 6 for 1/N frequency division. In the P-ROM8, those digital values D1-Dn are stored by being converted into digital values D1'-Dn' for generating the best preset voltage Vp. The digital values D1'-Dn' are converted by a D/A converter 7 into the voltage Vp, which is applied to a voltage-controlled oscillator 5. The output of the oscillator 5 is frequency-divided by a counter 6 into values which correspond to the digital values D1-Dn, and its outputs are compared with a reference signal from a reference oscillator 2 by a phase comparator 3; and the phase difference signal is passed through an LPF4 to obtain a voltage Vc, controlling the oscillator 5. Since the best preset voltage Vp is applied to the oscillator 5, a channel transition time is shortened regardless to whether a change in channel is large or not.
JP56045611A 1981-03-30 1981-03-30 Frequency synthesizer Pending JPS57160227A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56045611A JPS57160227A (en) 1981-03-30 1981-03-30 Frequency synthesizer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56045611A JPS57160227A (en) 1981-03-30 1981-03-30 Frequency synthesizer

Publications (1)

Publication Number Publication Date
JPS57160227A true JPS57160227A (en) 1982-10-02

Family

ID=12724162

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56045611A Pending JPS57160227A (en) 1981-03-30 1981-03-30 Frequency synthesizer

Country Status (1)

Country Link
JP (1) JPS57160227A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59214331A (en) * 1983-05-19 1984-12-04 Yaesu Musen Co Ltd Pll circuit
JPS59218045A (en) * 1983-05-25 1984-12-08 Yaesu Musen Co Ltd Pll circuit
JPH01105227U (en) * 1987-12-29 1989-07-14
EP0412491A2 (en) * 1989-08-10 1991-02-13 Mitsubishi Denki Kabushiki Kaisha Frequency Synthesizer
JPH0645539B2 (en) * 1986-12-13 1994-06-15 カンプラート、ヨアヒム Painkiller
WO2002091580A3 (en) * 2001-05-08 2003-04-10 Infineon Technologies Ag Phase locked loop
EP1374387A1 (en) * 2001-03-30 2004-01-02 Conexant Systems, Inc. System for controlling the frequency of an oscillator

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50155115A (en) * 1974-06-03 1975-12-15
JPS53127255A (en) * 1977-04-13 1978-11-07 Torio Kk Phase lock loop circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50155115A (en) * 1974-06-03 1975-12-15
JPS53127255A (en) * 1977-04-13 1978-11-07 Torio Kk Phase lock loop circuit

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59214331A (en) * 1983-05-19 1984-12-04 Yaesu Musen Co Ltd Pll circuit
JPS59218045A (en) * 1983-05-25 1984-12-08 Yaesu Musen Co Ltd Pll circuit
JPH0645539B2 (en) * 1986-12-13 1994-06-15 カンプラート、ヨアヒム Painkiller
JPH01105227U (en) * 1987-12-29 1989-07-14
EP0412491A2 (en) * 1989-08-10 1991-02-13 Mitsubishi Denki Kabushiki Kaisha Frequency Synthesizer
US5036295A (en) * 1989-08-10 1991-07-30 Mitsubishi Denki Kabushiki Kaisha Frequency synthesizer allowing rapid frequency switching
EP1374387A1 (en) * 2001-03-30 2004-01-02 Conexant Systems, Inc. System for controlling the frequency of an oscillator
EP1374387A4 (en) * 2001-03-30 2004-05-26 Skyworks Solutions Inc System for controlling the frequency of an oscillator
US7103127B2 (en) 2001-03-30 2006-09-05 Skyworks Solutions, Inc. System for controlling the frequency of an oscillator
WO2002091580A3 (en) * 2001-05-08 2003-04-10 Infineon Technologies Ag Phase locked loop
US6924706B2 (en) 2001-05-08 2005-08-02 Infineon Technologies Ag Phase locked loop

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