JPS55130206A - Waveform conversion circuit and fm modulator using circuit thereof - Google Patents

Waveform conversion circuit and fm modulator using circuit thereof

Info

Publication number
JPS55130206A
JPS55130206A JP3686279A JP3686279A JPS55130206A JP S55130206 A JPS55130206 A JP S55130206A JP 3686279 A JP3686279 A JP 3686279A JP 3686279 A JP3686279 A JP 3686279A JP S55130206 A JPS55130206 A JP S55130206A
Authority
JP
Japan
Prior art keywords
circuit
produced
signal
trapezoid
rectangular wave
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
JP3686279A
Other languages
Japanese (ja)
Inventor
Hideo Kashima
Makoto Furuhata
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 JP3686279A priority Critical patent/JPS55130206A/en
Publication of JPS55130206A publication Critical patent/JPS55130206A/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

Abstract

PURPOSE:To obtain a waveform conversion circuit featuring the steady operation by excluding the capacitor which is hard to be formed as the semiconductor element within the semiconductor integrated circuit. CONSTITUTION:The intermediate-frequency signal sent from intermediate-frequency filter 24 is applied to terminal 1' and then converted into the rectangular wave signal featuring the complementary relation through amplitude limiter 1 to be amplified by differential amplifier 2. The trapezoid wave signal is produced via charging circuit 3a, discharging circuit 3b and capacitor C2 and with use of the amplified signal of one side. In the same way, the rectangular wave signal is produced through waveform shaping circuit 4. These two signals receive the regulation of the amplitude level through constant voltage circuit 5 plus 1st and 2nd voltage limit circuits 6 and 7 each. After this, the two trapezoid wave signals of different amplitude levels are produced from the trapezoid wave signal through 1st level shift circuit 9. In the same way, the two rectangular wave signals of different amplitude levels are produced in the same way through 2nd level shift circuit 10. These trapezoid and rectangular wave signals are supplied to voltage comparator circuit 11, and thus the pulse signal of the fixed duration is produced at the zero-level crossing position of the intermediate-frequency signal.
JP3686279A 1979-03-30 1979-03-30 Waveform conversion circuit and fm modulator using circuit thereof Pending JPS55130206A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3686279A JPS55130206A (en) 1979-03-30 1979-03-30 Waveform conversion circuit and fm modulator using circuit thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3686279A JPS55130206A (en) 1979-03-30 1979-03-30 Waveform conversion circuit and fm modulator using circuit thereof

Publications (1)

Publication Number Publication Date
JPS55130206A true JPS55130206A (en) 1980-10-08

Family

ID=12481586

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3686279A Pending JPS55130206A (en) 1979-03-30 1979-03-30 Waveform conversion circuit and fm modulator using circuit thereof

Country Status (1)

Country Link
JP (1) JPS55130206A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4658134A (en) * 1985-04-04 1987-04-14 Kyoto Measuring Instruments Corp. Digital tape measure
JPH02171007A (en) * 1988-12-23 1990-07-02 Matsushita Electric Ind Co Ltd Fm demodulator
JPH04261203A (en) * 1991-03-30 1992-09-17 Rohm Co Ltd Fm demodulation circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4818421U (en) * 1971-07-09 1973-03-02

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4818421U (en) * 1971-07-09 1973-03-02

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4658134A (en) * 1985-04-04 1987-04-14 Kyoto Measuring Instruments Corp. Digital tape measure
JPH02171007A (en) * 1988-12-23 1990-07-02 Matsushita Electric Ind Co Ltd Fm demodulator
JPH04261203A (en) * 1991-03-30 1992-09-17 Rohm Co Ltd Fm demodulation circuit

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