JPS55124315A - Automatic gain control circuit - Google Patents

Automatic gain control circuit

Info

Publication number
JPS55124315A
JPS55124315A JP3167279A JP3167279A JPS55124315A JP S55124315 A JPS55124315 A JP S55124315A JP 3167279 A JP3167279 A JP 3167279A JP 3167279 A JP3167279 A JP 3167279A JP S55124315 A JPS55124315 A JP S55124315A
Authority
JP
Japan
Prior art keywords
circuit
amplifier
sum
gain control
supplied
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
JP3167279A
Other languages
Japanese (ja)
Inventor
Fuji Kanemasa
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 JP3167279A priority Critical patent/JPS55124315A/en
Publication of JPS55124315A publication Critical patent/JPS55124315A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03GCONTROL OF AMPLIFICATION
    • H03G3/00Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20Automatic control

Abstract

PURPOSE:To realize both reduction of the lead-in time of AGC and stability of the operation by giving the phase branching to the output of the variable gain amplifier and then giving the gain control via the square sum of the output of the phase branching. CONSTITUTION:The reception wave is supplied to 90 deg.-phase differential branching filter 13 via variable gain amplifier 2, and the signals featuring the phases by 90 deg. are squared each at squaring sum circuit 6 to obtain the sum. Then those signals are changed into the output signals. This sum signal is then supplied to gain control circuit 9 via switch 7. And if the sum signal is larger than the reference value TH, the gain of amplifier 2 is reduced by the output of circuit 9 to complete the lead-in of AGC. Then the data supplied receive synchronous detection via amplifier 2, and the reproduction of the data is carried out through decision circuit 11. The sum signal from circuit 6 as well as the reproduction signal are multiplied 8 and then supplied to circuit 9 via switch 7. As a result, the gain control is possible for amplifier 2 in the quick and steady way.
JP3167279A 1979-03-20 1979-03-20 Automatic gain control circuit Pending JPS55124315A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3167279A JPS55124315A (en) 1979-03-20 1979-03-20 Automatic gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3167279A JPS55124315A (en) 1979-03-20 1979-03-20 Automatic gain control circuit

Publications (1)

Publication Number Publication Date
JPS55124315A true JPS55124315A (en) 1980-09-25

Family

ID=12337606

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3167279A Pending JPS55124315A (en) 1979-03-20 1979-03-20 Automatic gain control circuit

Country Status (1)

Country Link
JP (1) JPS55124315A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3213059A1 (en) * 1981-06-17 1983-03-03 Toyota Jidosha Kogyo K.K., Toyota, Aichi MOUNTING STRUCTURE FOR THE UPPER GUIDE ARMS IN A HINGED SQUARE SUSPENSION SYSTEM
JPS5875912A (en) * 1981-10-09 1983-05-07 旭化成マイクロシステム株式会社 Automatic gain control loop having condenser operated in switching

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3213059A1 (en) * 1981-06-17 1983-03-03 Toyota Jidosha Kogyo K.K., Toyota, Aichi MOUNTING STRUCTURE FOR THE UPPER GUIDE ARMS IN A HINGED SQUARE SUSPENSION SYSTEM
US4453738A (en) * 1981-06-17 1984-06-12 Toyota Jidosha Kogyo Kabushiki Kaisha Mounting structure for upper control arms in a four link suspension system
JPS5875912A (en) * 1981-10-09 1983-05-07 旭化成マイクロシステム株式会社 Automatic gain control loop having condenser operated in switching

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