JPS55118212A - Demodulation circuit - Google Patents

Demodulation circuit

Info

Publication number
JPS55118212A
JPS55118212A JP2586979A JP2586979A JPS55118212A JP S55118212 A JPS55118212 A JP S55118212A JP 2586979 A JP2586979 A JP 2586979A JP 2586979 A JP2586979 A JP 2586979A JP S55118212 A JPS55118212 A JP S55118212A
Authority
JP
Japan
Prior art keywords
fed
input signal
function generator
control unit
conversion
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
JP2586979A
Other languages
Japanese (ja)
Other versions
JPH0125259B2 (en
Inventor
Shuji Murakami
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 JP2586979A priority Critical patent/JPS55118212A/en
Publication of JPS55118212A publication Critical patent/JPS55118212A/en
Publication of JPH0125259B2 publication Critical patent/JPH0125259B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/02—Details
    • H03C1/04—Means in or combined with modulating stage for reducing angle modulation

Landscapes

  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Amplifiers (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To equalize the AM-PM conversion by non-linear amplifying section, by controlling the function generator on the input signal. CONSTITUTION:After the input signal is fed to the phase modulator 202, it is multiplied with the reference carrier at the multiplication detector 204 and fed to the identifier 205 and the control unit 207. The output of the identifier 205 and the multiplier 204 is fed to the control unit 207 to generate the coefficient. On the other hand, the envelope detector 209 detects the amplitude of the input signal and the output is fed to the function generator 208 together with the coefficient generated with the control unit 207. The function generator is, for example, a multiplier and the signal on the two inputs is generated to drive the phase modulator 202 and the input signal is modulated so that the phase rotation by AM-PM conversion can be reduced, and the signal reducing the rotation corrects further the function generator and finally, the deterioration of characteristics by AM-PM conversion caused at the power amplifier can be avoided.
JP2586979A 1979-03-06 1979-03-06 Demodulation circuit Granted JPS55118212A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2586979A JPS55118212A (en) 1979-03-06 1979-03-06 Demodulation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2586979A JPS55118212A (en) 1979-03-06 1979-03-06 Demodulation circuit

Publications (2)

Publication Number Publication Date
JPS55118212A true JPS55118212A (en) 1980-09-11
JPH0125259B2 JPH0125259B2 (en) 1989-05-17

Family

ID=12177789

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2586979A Granted JPS55118212A (en) 1979-03-06 1979-03-06 Demodulation circuit

Country Status (1)

Country Link
JP (1) JPS55118212A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0522525A1 (en) * 1991-07-11 1993-01-13 Siemens Telecomunicazioni S.P.A. Process for compensation of AM/PM distortion of a transmitter by modulation of the local oscillator phase, and associated compensation circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50116205A (en) * 1974-02-26 1975-09-11
JPS5295908A (en) * 1976-02-06 1977-08-12 Nec Corp Adaptable carrier phase control device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50116205A (en) * 1974-02-26 1975-09-11
JPS5295908A (en) * 1976-02-06 1977-08-12 Nec Corp Adaptable carrier phase control device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0522525A1 (en) * 1991-07-11 1993-01-13 Siemens Telecomunicazioni S.P.A. Process for compensation of AM/PM distortion of a transmitter by modulation of the local oscillator phase, and associated compensation circuit

Also Published As

Publication number Publication date
JPH0125259B2 (en) 1989-05-17

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