JPS5634202A - Fm demodulating circuit - Google Patents

Fm demodulating circuit

Info

Publication number
JPS5634202A
JPS5634202A JP11057079A JP11057079A JPS5634202A JP S5634202 A JPS5634202 A JP S5634202A JP 11057079 A JP11057079 A JP 11057079A JP 11057079 A JP11057079 A JP 11057079A JP S5634202 A JPS5634202 A JP S5634202A
Authority
JP
Japan
Prior art keywords
amplifier
terminal
output
supplied
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
JP11057079A
Other languages
Japanese (ja)
Other versions
JPS643083B2 (en
Inventor
Masami Miura
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP11057079A priority Critical patent/JPS5634202A/en
Priority to US06/181,930 priority patent/US4339726A/en
Priority to GB8027794A priority patent/GB2060291B/en
Priority to DE3050934A priority patent/DE3050934C2/en
Priority to DE3032660A priority patent/DE3032660C2/en
Publication of JPS5634202A publication Critical patent/JPS5634202A/en
Publication of JPS643083B2 publication Critical patent/JPS643083B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B2200/00—Indexing scheme relating to details of oscillators covered by H03B
    • H03B2200/006—Functional aspects of oscillators
    • H03B2200/0082—Lowering the supply voltage and saving power
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D13/00—Circuits for comparing the phase or frequency of two mutually-independent oscillations
    • H03D13/003—Circuits for comparing the phase or frequency of two mutually-independent oscillations in which both oscillations are converted by logic means into pulses which are applied to filtering or integrating means
    • H03D13/004—Circuits for comparing the phase or frequency of two mutually-independent oscillations in which both oscillations are converted by logic means into pulses which are applied to filtering or integrating means the logic means delivering pulses at more than one terminal, e.g. up and down pulses
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
    • H03D2200/0001—Circuit elements of demodulators
    • H03D2200/0009—Emitter or source coupled transistor pairs or long tail pairs
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
    • H03D2200/0041—Functional aspects of demodulators
    • H03D2200/0082—Quadrature arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuits Of Receivers In General (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

PURPOSE:To obtain an FM detector which demonstrates its superior performance even for the FM receiver using a low-voltage power source of 3V or less, by constituting a demodulating circuit by an intermediate frequency signal amplifier, a phase shift circuit, an amplitude limiting amplifier, an OR circuit, an LPF, a low- frequency amplifier, and so on. CONSTITUTION:The FM intermediate frequency signal input from terminal T is applied to intermediate frequency signal amplifier 21, and the output is supplied to phase shift circuit 22 through terminal (u), and simultaneously, the output to terminal (u) is branched and is supplied to amplitude limiting amplifier 23 also. Next, the output of circuit 22 is applied to another amplitude limiting amplifier 24 through terminal (v), and two outputs which are generated in amplifier 23 and are inverted for each other are supplied to OR circuits 25 and 26 through M and N point respectively, and one output from amplifier 24 is applied to circuits 25 and 26 also. After that, outputs of circuits 25 and 26 are supplied to LPFs 27 and 28 through P and Q points respectively, and their outputs are applied to low-frequency amplifier 29 through R and S points respectively, and are taken out as the FM demodulation output from terminal (o).
JP11057079A 1979-08-29 1979-08-29 Fm demodulating circuit Granted JPS5634202A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP11057079A JPS5634202A (en) 1979-08-29 1979-08-29 Fm demodulating circuit
US06/181,930 US4339726A (en) 1979-08-29 1980-08-27 Demodulator of angle modulated signal operable by low power voltage
GB8027794A GB2060291B (en) 1979-08-29 1980-08-28 Angle demodulators
DE3050934A DE3050934C2 (en) 1979-08-29 1980-08-29 Demodulator circuit for demodulating an angle-modulated input signal
DE3032660A DE3032660C2 (en) 1979-08-29 1980-08-29 Demodulator circuit for demodulating an angle-modulated input signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11057079A JPS5634202A (en) 1979-08-29 1979-08-29 Fm demodulating circuit

Publications (2)

Publication Number Publication Date
JPS5634202A true JPS5634202A (en) 1981-04-06
JPS643083B2 JPS643083B2 (en) 1989-01-19

Family

ID=14539173

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11057079A Granted JPS5634202A (en) 1979-08-29 1979-08-29 Fm demodulating circuit

Country Status (1)

Country Link
JP (1) JPS5634202A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01249894A (en) * 1988-02-17 1989-10-05 Shell Internatl Res Maatschappij Bv Lubricant composition containing viscosity index modifier having dispersant characteristics
EP0467358A2 (en) * 1990-07-18 1992-01-22 Fujitsu Limited A demodulator and a polarization diversity receiver for coherent optical communication provided with the demodulator

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53125751A (en) * 1977-04-08 1978-11-02 Toshiba Corp Fm detection circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53125751A (en) * 1977-04-08 1978-11-02 Toshiba Corp Fm detection circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01249894A (en) * 1988-02-17 1989-10-05 Shell Internatl Res Maatschappij Bv Lubricant composition containing viscosity index modifier having dispersant characteristics
EP0467358A2 (en) * 1990-07-18 1992-01-22 Fujitsu Limited A demodulator and a polarization diversity receiver for coherent optical communication provided with the demodulator
US5253097A (en) * 1990-07-18 1993-10-12 Fujitsu Limited Demodulator and a polarization diversity receiver for coherent optical communication provided with the demodulator

Also Published As

Publication number Publication date
JPS643083B2 (en) 1989-01-19

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