JPS5720004A - Fm modulating and demodulating circuit - Google Patents

Fm modulating and demodulating circuit

Info

Publication number
JPS5720004A
JPS5720004A JP9469680A JP9469680A JPS5720004A JP S5720004 A JPS5720004 A JP S5720004A JP 9469680 A JP9469680 A JP 9469680A JP 9469680 A JP9469680 A JP 9469680A JP S5720004 A JPS5720004 A JP S5720004A
Authority
JP
Japan
Prior art keywords
vco2
vco1
circuit
voltage
distortions
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
JP9469680A
Other languages
Japanese (ja)
Inventor
Ryota Akiyama
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 JP9469680A priority Critical patent/JPS5720004A/en
Publication of JPS5720004A publication Critical patent/JPS5720004A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation

Landscapes

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

Abstract

PURPOSE:To improve an S/N ratio and to reduced distortions with simple constitution by applying a control voltage to a voltage-controlled oscillator via a distortion compensating circuit, composed of a diode and a resistance, in a circuit which uses a PLL. CONSTITUTION:In an FM modulating and an FM demodulating circuit, distortion compensating circuits CPS1 and CPS2 are connected between amplifiers AMP1 and AMP2, and voltage-controlled oscillators VCO1 and VCO2. The CPS1 and CPS2 are each composed of a parallel circuit of a diode and a resistance, and characteristics inverse of voltage frequency characteristics of the VCO1 and VCO2 are obtained by adjusting resistance values of them. Consequently, distortions due to the nonlinearity of the VCO1 and VCO2 are compensated and an S/N ratio is therefore improved by making the sensitivity of the VCO1 and VCO2 relatively small. In addition, distortions are reduced.
JP9469680A 1980-07-11 1980-07-11 Fm modulating and demodulating circuit Pending JPS5720004A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9469680A JPS5720004A (en) 1980-07-11 1980-07-11 Fm modulating and demodulating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9469680A JPS5720004A (en) 1980-07-11 1980-07-11 Fm modulating and demodulating circuit

Publications (1)

Publication Number Publication Date
JPS5720004A true JPS5720004A (en) 1982-02-02

Family

ID=14117341

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9469680A Pending JPS5720004A (en) 1980-07-11 1980-07-11 Fm modulating and demodulating circuit

Country Status (1)

Country Link
JP (1) JPS5720004A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58182926A (en) * 1982-04-20 1983-10-26 Sanyo Electric Co Ltd Pll circuit
JPS61135232A (en) * 1984-12-06 1986-06-23 Matsushita Electric Ind Co Ltd Synthesized signal generator
JPH0476711U (en) * 1990-11-19 1992-07-03

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58182926A (en) * 1982-04-20 1983-10-26 Sanyo Electric Co Ltd Pll circuit
JPS61135232A (en) * 1984-12-06 1986-06-23 Matsushita Electric Ind Co Ltd Synthesized signal generator
JPH0476711U (en) * 1990-11-19 1992-07-03

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