JPS5636237A - Rf modulator - Google Patents

Rf modulator

Info

Publication number
JPS5636237A
JPS5636237A JP11175579A JP11175579A JPS5636237A JP S5636237 A JPS5636237 A JP S5636237A JP 11175579 A JP11175579 A JP 11175579A JP 11175579 A JP11175579 A JP 11175579A JP S5636237 A JPS5636237 A JP S5636237A
Authority
JP
Japan
Prior art keywords
circuit
oscillating circuit
counter
analogue signal
surface elastic
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
JP11175579A
Other languages
Japanese (ja)
Inventor
Kotaro Kawamura
Toshinori Murata
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP11175579A priority Critical patent/JPS5636237A/en
Publication of JPS5636237A publication Critical patent/JPS5636237A/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
    • H03L7/20—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a harmonic phase-locked loop, i.e. a loop which can be locked to one of a number of harmonically related frequencies applied to it

Landscapes

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

Abstract

PURPOSE:To make it possible to select many channels with accurate frequencies, by applying the frequency synthesizer using a surface elastic wave filter to the carrier wave oscillating circuit. CONSTITUTION:The output of carrier wave oscillating circuit 14 passes through surface elastic wave (SAW) filter 15 and is applied to program counter 19 through detecting and amplifying circuit 16 and waveform shaping circuit 17. When contents of counter 19 agree with data from channel selection data input terminal 18, output data of counter 19 is applied to D/A converting circuit 20 and becomes an analogue signal and is applied to oscillating circuit 14. By this analogue signal, the oscillation frequency of oscillating circuit 14 is controlled.
JP11175579A 1979-09-03 1979-09-03 Rf modulator Pending JPS5636237A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11175579A JPS5636237A (en) 1979-09-03 1979-09-03 Rf modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11175579A JPS5636237A (en) 1979-09-03 1979-09-03 Rf modulator

Publications (1)

Publication Number Publication Date
JPS5636237A true JPS5636237A (en) 1981-04-09

Family

ID=14569357

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11175579A Pending JPS5636237A (en) 1979-09-03 1979-09-03 Rf modulator

Country Status (1)

Country Link
JP (1) JPS5636237A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63219596A (en) * 1987-03-10 1988-09-13 Kosaku:Kk Tin-lead alloy electroplating method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63219596A (en) * 1987-03-10 1988-09-13 Kosaku:Kk Tin-lead alloy electroplating method

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