JPS55130207A - Fm detection circuit - Google Patents

Fm detection circuit

Info

Publication number
JPS55130207A
JPS55130207A JP3876679A JP3876679A JPS55130207A JP S55130207 A JPS55130207 A JP S55130207A JP 3876679 A JP3876679 A JP 3876679A JP 3876679 A JP3876679 A JP 3876679A JP S55130207 A JPS55130207 A JP S55130207A
Authority
JP
Japan
Prior art keywords
input signal
mosfet
switch
circuit
toward terminal
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
JP3876679A
Other languages
Japanese (ja)
Inventor
Yasuhiro Okada
Masashi Sugano
Michio Okamoto
Shunichi Nezu
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP3876679A priority Critical patent/JPS55130207A/en
Publication of JPS55130207A publication Critical patent/JPS55130207A/en
Pending 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
    • H03D3/04—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by counting or integrating cycles of oscillations

Landscapes

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

Abstract

PURPOSE:To ensure the demodulation of the FM signal by giving the differetial amplification to the input signal and then giving ON/OFF to the two MOSFET's with the two outputs of the input signal through the control given to the charge/discharge of the capacitor connected between the two MOSFET's. CONSTITUTION:When switch 12 is turned toward terminal 11 at circuit B, the electric charge is charged to CV1 of capacitor 13 (capacity C). And the charge amount flowing over toward terminal 14 features Q=C(V1-V2) when switch 12 is turned toward terminal 14, and thus the average level features I=(V1-V2)C/T (T: cycle) for the alternating current between terminals 11 and 14. With the replacement with insertion of such circuit B between terminals 3 and 17 of FM detection circuit A, switch 12 corresponds to 5 and 6 of MOSFET's. In other words, the input signal given from input signal source 1 which gave the frequency modulation to the rectangular wave is applied to differential amplifier 4, and the two signals of opposite phases to each other which are the output of amplifier 4 are supplied to the gate. As a result, transistors Tr5, 6 are switched to each other, and the frequency of the frequency modulation wave, i.e., the output DC voltage corresponding to sampling cycle T can be extracted out of load 8 via capacitor 7.
JP3876679A 1979-03-30 1979-03-30 Fm detection circuit Pending JPS55130207A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3876679A JPS55130207A (en) 1979-03-30 1979-03-30 Fm detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3876679A JPS55130207A (en) 1979-03-30 1979-03-30 Fm detection circuit

Publications (1)

Publication Number Publication Date
JPS55130207A true JPS55130207A (en) 1980-10-08

Family

ID=12534402

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3876679A Pending JPS55130207A (en) 1979-03-30 1979-03-30 Fm detection circuit

Country Status (1)

Country Link
JP (1) JPS55130207A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58133004A (en) * 1982-02-03 1983-08-08 Matsushita Electric Ind Co Ltd Amplitude detector

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5024831A (en) * 1973-07-03 1975-03-17

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5024831A (en) * 1973-07-03 1975-03-17

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58133004A (en) * 1982-02-03 1983-08-08 Matsushita Electric Ind Co Ltd Amplitude detector

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