JPS55104179A - Television picture intermediate frequency amplifier - Google Patents

Television picture intermediate frequency amplifier

Info

Publication number
JPS55104179A
JPS55104179A JP1238879A JP1238879A JPS55104179A JP S55104179 A JPS55104179 A JP S55104179A JP 1238879 A JP1238879 A JP 1238879A JP 1238879 A JP1238879 A JP 1238879A JP S55104179 A JPS55104179 A JP S55104179A
Authority
JP
Japan
Prior art keywords
circuit
amplifying
differential
output
amplifying circuit
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
JP1238879A
Other languages
Japanese (ja)
Other versions
JPS615309B2 (en
Inventor
Hajime Takano
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP1238879A priority Critical patent/JPS55104179A/en
Publication of JPS55104179A publication Critical patent/JPS55104179A/en
Publication of JPS615309B2 publication Critical patent/JPS615309B2/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

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To make excellent the high frequency characteristics by increasing the freedom of circuit design, through giving the amplitude limit function to the differential amplifying circuit of the final stage of the video IF amplifying circuit and making adjustable the input amplitude value to the synchronizing detection circuit. CONSTITUTION:A pair of differential transistors Tr12, Tr13 are given to the third amplifying circuit 11 of the video IF amplifying circuit 2, the differential output of the second amplifier 10 is fed to the base, the load resistors 14, 15 are connected to the collector, and the emitter of the both Tr12, 13 is grounded through the constant current source 16. Further, the output of the circuit 2 is fed to the synchronizing detection circuit 4 from the collector of Tr13 of the circuit 2, and the output of the gain control circuit 5 controls the gain of the amplifying circuits 9 and 10. Thus, the amplitude limit function is given to the circuit 11 constituting the differential amplifying circuit of the final stage and the input amplitude value to the circuit 4 is made adjustable, allowing to increase the freedom of circuit design and to make excellent the high frequency characteristics.
JP1238879A 1979-02-05 1979-02-05 Television picture intermediate frequency amplifier Granted JPS55104179A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1238879A JPS55104179A (en) 1979-02-05 1979-02-05 Television picture intermediate frequency amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1238879A JPS55104179A (en) 1979-02-05 1979-02-05 Television picture intermediate frequency amplifier

Publications (2)

Publication Number Publication Date
JPS55104179A true JPS55104179A (en) 1980-08-09
JPS615309B2 JPS615309B2 (en) 1986-02-17

Family

ID=11803875

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1238879A Granted JPS55104179A (en) 1979-02-05 1979-02-05 Television picture intermediate frequency amplifier

Country Status (1)

Country Link
JP (1) JPS55104179A (en)

Also Published As

Publication number Publication date
JPS615309B2 (en) 1986-02-17

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