JPS54156457A - Automatic gain control circuit - Google Patents

Automatic gain control circuit

Info

Publication number
JPS54156457A
JPS54156457A JP6513278A JP6513278A JPS54156457A JP S54156457 A JPS54156457 A JP S54156457A JP 6513278 A JP6513278 A JP 6513278A JP 6513278 A JP6513278 A JP 6513278A JP S54156457 A JPS54156457 A JP S54156457A
Authority
JP
Japan
Prior art keywords
output
converter
conversion
amplifier
gain
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
JP6513278A
Other languages
Japanese (ja)
Inventor
Shigeru Asakawa
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP6513278A priority Critical patent/JPS54156457A/en
Publication of JPS54156457A publication Critical patent/JPS54156457A/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

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To establish the AGC circuit effective to wired communication, by detecting the output of the variable gain amplifier, comparing and discriminating it with the reference signal level, and giving the signal in A/D conversion for the output to the set gain value of the amplifier with partial D/A conversion. CONSTITUTION:The input signal is amplified 2 via the variable gain amplifier 1, outputted and detected 3. The output of the detector 3 is compared and discriminated with the reference voltage A at the comparison circuit 4, and the error signal is DC-amplified 5 and converted into a digital value at the A/D converter 6. The partial D/A converter is provided in the converter 6, and analog signal value converted is fed to the variable gain amplifier 1 as the gain control value to control the gain. When the output of the comparison circuit 4 is stable, the A/D conversion of the converter 6 is stopped, the D/A conversion output is held constant at the sampling hold circuit to control the amplifier 1. Accordingly, if the transmission condition is once determined, since the setting of the reception gain is easily preset and it is stably held until the specified information communication is finished, it is effective to the facsimile communication.
JP6513278A 1978-05-31 1978-05-31 Automatic gain control circuit Pending JPS54156457A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6513278A JPS54156457A (en) 1978-05-31 1978-05-31 Automatic gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6513278A JPS54156457A (en) 1978-05-31 1978-05-31 Automatic gain control circuit

Publications (1)

Publication Number Publication Date
JPS54156457A true JPS54156457A (en) 1979-12-10

Family

ID=13278033

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6513278A Pending JPS54156457A (en) 1978-05-31 1978-05-31 Automatic gain control circuit

Country Status (1)

Country Link
JP (1) JPS54156457A (en)

Similar Documents

Publication Publication Date Title
CA2093638A1 (en) High dynamic range closed loop automatic gain control circuit
MX9605108A (en) Method and apparatus for automatic gain control in a digital receiver.
JPS5711548A (en) Optical receiving circuit
JPS54156457A (en) Automatic gain control circuit
JPS57168513A (en) Automatic gain controlling system of optical receiver
JPS5488704A (en) Automatic gain control system
JPS5732113A (en) Logarithmic amplifier
JPS6410746A (en) Spread spectrum communication type agc circuit
JPS5679509A (en) Automatic gain control circuit
JPS5757036A (en) Spectrum diffusion receiver
KR830007024A (en) TV automatic gain control system
JPS5787610A (en) Analog gain control system
JPS57188163A (en) Signal discriminator
JPS5449052A (en) Agc device
JPS562767A (en) Impulsive noise eliminating circuit
JPS57138209A (en) Automatic gain controller
JPS56100539A (en) Light agc system
JPS573409A (en) Agc circuit
JPS6412631A (en) Optical receiving circuit
JPS5485785A (en) Automatic correcting circuit of sensitivities of photo detectors
JPS5711515A (en) Automatic gain control amplifier
JPS55151862A (en) Automatic gain control circuit for facsimile transmitter
JPS6437133A (en) Optical reception circuit
JPS56149108A (en) Automatic gain control voltage outputting circuit
NL7707414A (en) Local surface radiation absorption meter - rotates penetrating radiation and has detectors and A=D converter, adaptor and digital memory