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JPS5675711A - Detection circuit for difference between frequencies - Google Patents

Detection circuit for difference between frequencies

Info

Publication number
JPS5675711A
JPS5675711A JP15275779A JP15275779A JPS5675711A JP S5675711 A JPS5675711 A JP S5675711A JP 15275779 A JP15275779 A JP 15275779A JP 15275779 A JP15275779 A JP 15275779A JP S5675711 A JPS5675711 A JP S5675711A
Authority
JP
Japan
Prior art keywords
multiplication
low frequency
circuit
frequency component
input
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
JP15275779A
Other languages
Japanese (ja)
Inventor
Fumio Sugiyama
Tsukasa Okai
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP15275779A priority Critical patent/JPS5675711A/en
Publication of JPS5675711A publication Critical patent/JPS5675711A/en
Pending legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE:To obtain the analog signal according to frequency signal with a simple circuit, by picking up the low frequency component as a result of multiplication for two signals, and also picking up the low frequency component as the result of multiplication between one signal delayed by 90 deg. phase shift and another signal delayed the same. CONSTITUTION:Signals S1, S2 input to input terminals 1, 2 are multiplied at a multiplication circuit 3, and the low frequency component S3 as the result of multiplication is picked up at a low-pass filter 4. On the other hand, the signal S1 is input to a delay circuit 5 and the signal S2 is input to a delay circuit 7 via a 90 deg. phase shift circuit 6, and the low frequency component S4 as a result of the multiplication of the outputs is obtained at a multiplication circuit 8 and a low-pass filter 9. After the low frequency components S3, S4 are multiplied at a multiplication circuit 10, the low frequency component is picked up 11 and picked up as the detection output S5 of the frequency difference of the input signals S1 and S2 at the output terminal 12.
JP15275779A 1979-11-26 1979-11-26 Detection circuit for difference between frequencies Pending JPS5675711A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15275779A JPS5675711A (en) 1979-11-26 1979-11-26 Detection circuit for difference between frequencies

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15275779A JPS5675711A (en) 1979-11-26 1979-11-26 Detection circuit for difference between frequencies

Publications (1)

Publication Number Publication Date
JPS5675711A true JPS5675711A (en) 1981-06-23

Family

ID=15547484

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15275779A Pending JPS5675711A (en) 1979-11-26 1979-11-26 Detection circuit for difference between frequencies

Country Status (1)

Country Link
JP (1) JPS5675711A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6460010A (en) * 1987-08-31 1989-03-07 Fujitsu Ltd Automatic frequency controller for frequency modulator
JP2014052282A (en) * 2012-09-07 2014-03-20 Rohm Co Ltd Frequency measurement circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4878980A (en) * 1972-01-24 1973-10-23

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4878980A (en) * 1972-01-24 1973-10-23

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6460010A (en) * 1987-08-31 1989-03-07 Fujitsu Ltd Automatic frequency controller for frequency modulator
JP2014052282A (en) * 2012-09-07 2014-03-20 Rohm Co Ltd Frequency measurement circuit

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