JPS5446452A - Automatic gain control amplifier - Google Patents

Automatic gain control amplifier

Info

Publication number
JPS5446452A
JPS5446452A JP11220677A JP11220677A JPS5446452A JP S5446452 A JPS5446452 A JP S5446452A JP 11220677 A JP11220677 A JP 11220677A JP 11220677 A JP11220677 A JP 11220677A JP S5446452 A JPS5446452 A JP S5446452A
Authority
JP
Japan
Prior art keywords
output
circuit
level
gain control
comparator
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
JP11220677A
Other languages
Japanese (ja)
Inventor
Tadao Oiwa
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 JP11220677A priority Critical patent/JPS5446452A/en
Publication of JPS5446452A publication Critical patent/JPS5446452A/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 without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers

Abstract

PURPOSE:To simplify a design and fabrication without using an analog filter by composing the output level detection part of an automatic gain control amplifier of a comparator and counter and by making possible the discrimination of a digital output level and gain control. CONSTITUTION:Continuous signal (a) for a gain adjustment of input terminal 11 is inputted to variable gain amplifier 12, whose output is applied to comparator 14 of level discriminating circuit 30. In this comparator 14, it is compared with a reference signal from input terminal 15 and when the output of amplifier 12 is greater than the reference value, counter 17 sarts counting for a certain time through the control of control circuit 21. This discrete value is applied to threshold circuit 19 and when it surpasses a preset value, an output signal is outputted. This output signal is applied to DC level generating circuit 31 via control circuit 21. This DC level generating circuit 31 via control circuit 21. This DC level generating circuit 31, which consists gain control counter 23 and D/A converter 25, generates a DC level increased at every constant time when discriminating circuit 30 generates no output, and holds the output at that time when it generates its output.
JP11220677A 1977-09-20 1977-09-20 Automatic gain control amplifier Pending JPS5446452A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11220677A JPS5446452A (en) 1977-09-20 1977-09-20 Automatic gain control amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11220677A JPS5446452A (en) 1977-09-20 1977-09-20 Automatic gain control amplifier

Publications (1)

Publication Number Publication Date
JPS5446452A true JPS5446452A (en) 1979-04-12

Family

ID=14580899

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11220677A Pending JPS5446452A (en) 1977-09-20 1977-09-20 Automatic gain control amplifier

Country Status (1)

Country Link
JP (1) JPS5446452A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0272707A (en) * 1988-09-08 1990-03-13 Matsushita Electric Ind Co Ltd Automatic amplitude setting circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0272707A (en) * 1988-09-08 1990-03-13 Matsushita Electric Ind Co Ltd Automatic amplitude setting circuit

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