JPS5742218A - Delay automatic gain control circuit - Google Patents

Delay automatic gain control circuit

Info

Publication number
JPS5742218A
JPS5742218A JP11778480A JP11778480A JPS5742218A JP S5742218 A JPS5742218 A JP S5742218A JP 11778480 A JP11778480 A JP 11778480A JP 11778480 A JP11778480 A JP 11778480A JP S5742218 A JPS5742218 A JP S5742218A
Authority
JP
Japan
Prior art keywords
peak value
amplifier
output
picked
rfagc
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.)
Granted
Application number
JP11778480A
Other languages
Japanese (ja)
Other versions
JPS6221442B2 (en
Inventor
Mitsuru Hayakawa
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.)
Victor Company of Japan Ltd
Nippon Victor KK
Original Assignee
Victor Company of Japan Ltd
Nippon Victor KK
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 Victor Company of Japan Ltd, Nippon Victor KK filed Critical Victor Company of Japan Ltd
Priority to JP11778480A priority Critical patent/JPS5742218A/en
Publication of JPS5742218A publication Critical patent/JPS5742218A/en
Publication of JPS6221442B2 publication Critical patent/JPS6221442B2/ja
Granted 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
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver

Landscapes

  • Television Receiver Circuits (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To enable to hold sufficiently high for an AGC loop gain, by constituting an RFAGC circuit operated with the output of an IFAGC circuit with an error amplifier picking up the difference between the peak value and the threshold value, peak value detection circuit and LPF. CONSTITUTION:An output signal (a) from a peak value detector 9 of an IFAGC circuit 62 is applied to an error amplifier 11' of an RFAGC circuit 72, a pulse output corresponding to the difference with a fixed threshold value (b) is picked up from the amplifier 11' and applied to a peak value detector 15. A signal (f) in proportion to the peak value of the output pulse of the amplifier 11' is picked up from the detector 15, and the signal (f) is averaged at an LPF13 and picked up as an RFAGC voltage (g). Since the detector 15 detects the peak value of the output pulse of the amplifier 11', it is not subjected to the variation of the pulse width of the amplifier 11' and since the voltage (g) is the average of the peak value detected output, sufficiently greater level can be picked up and the loop gain of the RFAGC can be kept sufficiently higher.
JP11778480A 1980-08-28 1980-08-28 Delay automatic gain control circuit Granted JPS5742218A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11778480A JPS5742218A (en) 1980-08-28 1980-08-28 Delay automatic gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11778480A JPS5742218A (en) 1980-08-28 1980-08-28 Delay automatic gain control circuit

Publications (2)

Publication Number Publication Date
JPS5742218A true JPS5742218A (en) 1982-03-09
JPS6221442B2 JPS6221442B2 (en) 1987-05-13

Family

ID=14720223

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11778480A Granted JPS5742218A (en) 1980-08-28 1980-08-28 Delay automatic gain control circuit

Country Status (1)

Country Link
JP (1) JPS5742218A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59147515A (en) * 1983-02-10 1984-08-23 Matsushita Electric Ind Co Ltd Gain control circuit
US7679687B2 (en) 2005-01-17 2010-03-16 Funai Electric Co., Ltd. Digital terrestrial TV broadcast signal receiving system and digital terrestrial TV broadcast signal receiver

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59147515A (en) * 1983-02-10 1984-08-23 Matsushita Electric Ind Co Ltd Gain control circuit
US7679687B2 (en) 2005-01-17 2010-03-16 Funai Electric Co., Ltd. Digital terrestrial TV broadcast signal receiving system and digital terrestrial TV broadcast signal receiver

Also Published As

Publication number Publication date
JPS6221442B2 (en) 1987-05-13

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