JPS5625808A - Automatic gain control circuit for amplitude modulator - Google Patents

Automatic gain control circuit for amplitude modulator

Info

Publication number
JPS5625808A
JPS5625808A JP10161379A JP10161379A JPS5625808A JP S5625808 A JPS5625808 A JP S5625808A JP 10161379 A JP10161379 A JP 10161379A JP 10161379 A JP10161379 A JP 10161379A JP S5625808 A JPS5625808 A JP S5625808A
Authority
JP
Japan
Prior art keywords
signal
carrier
circuit
fed
output
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
JP10161379A
Other languages
Japanese (ja)
Inventor
Tsuguo Otsuki
Tadashi Yoshikawa
Masao Takeda
Kazuo Sato
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP10161379A priority Critical patent/JPS5625808A/en
Publication of JPS5625808A publication Critical patent/JPS5625808A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers

Landscapes

  • Amplitude Modulation (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To make unnecessary the transformer and to enable the circuit to be incorporated on the same semiconductor substrate, by providing the carrier level variable circuit controlled with the level automatic control signal with the input terminal of carrier signal. CONSTITUTION:The multiplier type modulation circuit 6 is formed with the balanced modulation circuit 4 and the modulated signal input circuit 5. Further, the carrier level variable circuit having the carrier input terminals 3, 3' is formed with the resistor R10 and MOSFET.Q7 for the attenuator, and the attenuation control voltage Vc being the AGC signal is fed to the gate of Q7. The signal voltage ep and the carrier voltage ec are input to the modulation circuit 11 thus constituted, and the output is fed to the low pass filter 12. The output of the filter 12 is separated with the hybrid transformer 13. One output separated is fed to the band-pass filter 14 and monitor signal only is picked up. The picked-up signal is amplified, rectified and extended to be the gain control signal 23.
JP10161379A 1979-08-09 1979-08-09 Automatic gain control circuit for amplitude modulator Pending JPS5625808A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10161379A JPS5625808A (en) 1979-08-09 1979-08-09 Automatic gain control circuit for amplitude modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10161379A JPS5625808A (en) 1979-08-09 1979-08-09 Automatic gain control circuit for amplitude modulator

Publications (1)

Publication Number Publication Date
JPS5625808A true JPS5625808A (en) 1981-03-12

Family

ID=14305244

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10161379A Pending JPS5625808A (en) 1979-08-09 1979-08-09 Automatic gain control circuit for amplitude modulator

Country Status (1)

Country Link
JP (1) JPS5625808A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60180210A (en) * 1984-02-27 1985-09-14 Rohm Co Ltd Automatic gain adjusting circuit
JPS60182812A (en) * 1984-02-29 1985-09-18 Rohm Co Ltd Automatic gain adjusting circuit
JPH04342303A (en) * 1991-05-20 1992-11-27 Sanyo Electric Co Ltd Balanced modulator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60180210A (en) * 1984-02-27 1985-09-14 Rohm Co Ltd Automatic gain adjusting circuit
JPH0354890B2 (en) * 1984-02-27 1991-08-21
JPS60182812A (en) * 1984-02-29 1985-09-18 Rohm Co Ltd Automatic gain adjusting circuit
JPH04342303A (en) * 1991-05-20 1992-11-27 Sanyo Electric Co Ltd Balanced modulator

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