JPS57192115A - Agc circuit - Google Patents

Agc circuit

Info

Publication number
JPS57192115A
JPS57192115A JP7652981A JP7652981A JPS57192115A JP S57192115 A JPS57192115 A JP S57192115A JP 7652981 A JP7652981 A JP 7652981A JP 7652981 A JP7652981 A JP 7652981A JP S57192115 A JPS57192115 A JP S57192115A
Authority
JP
Japan
Prior art keywords
current
voltage
equal
agc
capacitor
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
JP7652981A
Other languages
Japanese (ja)
Inventor
Masanori Ienaka
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 JP7652981A priority Critical patent/JPS57192115A/en
Publication of JPS57192115A publication Critical patent/JPS57192115A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0017—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier
    • H03G1/0023—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier in emitter-coupled or cascode amplifiers

Abstract

PURPOSE:To realize the AGC operation with high quality, by forming a control signal by providing a smoothing circuit for an output of a current source forming a current signal which is a difference between a current signal proportional to an AGC voltage and a reference DC current and forming a control signal. CONSTITUTION:When an AGC voltage VAGC applied to a differential transitor TRQ40 is equal to a reference voltage Vr applied to a TRQ41, a current I3 proportional to the voltage VACG and a reference current i2 is equal and a current signal difference I3-I2 is zero. When VAGC>Vr, since the I3 is greater than the I2 and the current I3-I2 is a charging current to a capacitor C104 of a smoothing circuit, the control voltage is increased. On the other hand, when VAGC<Vr, since the I3 is smaller than the I2 and the curent I3-I2 is a discharge current to the capacitor C104, the control voltage is lowered. In the AGC operation like this, the charge/discharge time constant to the capacitor C104 can be made equal. Thus, since the attack time and the recovery time are equal, the AGC operation with high quality can be realized.
JP7652981A 1981-05-22 1981-05-22 Agc circuit Pending JPS57192115A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7652981A JPS57192115A (en) 1981-05-22 1981-05-22 Agc circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7652981A JPS57192115A (en) 1981-05-22 1981-05-22 Agc circuit

Publications (1)

Publication Number Publication Date
JPS57192115A true JPS57192115A (en) 1982-11-26

Family

ID=13607804

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7652981A Pending JPS57192115A (en) 1981-05-22 1981-05-22 Agc circuit

Country Status (1)

Country Link
JP (1) JPS57192115A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01316011A (en) * 1988-06-16 1989-12-20 Sony Corp Agc circuit
JPH01319311A (en) * 1988-06-21 1989-12-25 Sony Corp Agc circuit
EP1378993A3 (en) * 2002-07-01 2005-06-08 Texas Instruments Deutschland Gmbh Low power regulated amplifier in a transponder

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01316011A (en) * 1988-06-16 1989-12-20 Sony Corp Agc circuit
JPH01319311A (en) * 1988-06-21 1989-12-25 Sony Corp Agc circuit
EP1378993A3 (en) * 2002-07-01 2005-06-08 Texas Instruments Deutschland Gmbh Low power regulated amplifier in a transponder
US6982627B2 (en) 2002-07-01 2006-01-03 Texas Instruments Incorporated Low power regulated amplifier for a transponder

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