JPS56106409A - Gain control circuit - Google Patents

Gain control circuit

Info

Publication number
JPS56106409A
JPS56106409A JP782680A JP782680A JPS56106409A JP S56106409 A JPS56106409 A JP S56106409A JP 782680 A JP782680 A JP 782680A JP 782680 A JP782680 A JP 782680A JP S56106409 A JPS56106409 A JP S56106409A
Authority
JP
Japan
Prior art keywords
voltage
power supply
transistor
terminal
uhf
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
JP782680A
Other languages
Japanese (ja)
Other versions
JPS6352484B2 (en
Inventor
Hiroshi Hatashita
Toshio Nagashima
Takeshi Saito
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 JP782680A priority Critical patent/JPS56106409A/en
Publication of JPS56106409A publication Critical patent/JPS56106409A/en
Publication of JPS6352484B2 publication Critical patent/JPS6352484B2/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)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

PURPOSE:To decrease the number of component parts, by using an inverter circuit that improves the disturbing characteristics to the ferroelectric field cross modulation in common to the FET for both the UHF and VHF. CONSTITUTION:The power supply voltage is applied to the drain 2a of the FET21 via the power supply terminal 14a when receiving the VHF, and thus a high frequency amplifying circuit of the VHF tuner works. In this instant, the AGC voltage is applied to the base of the transistor 15 to flow the collector current. Then the voltage obtained by subtracting the voltage drop component caused by the resistance 35 from the voltage applied to the power supply voltage terminal 40 is produced at the collector of the transistor 15. And the voltage obtained by giving a voltage division to the voltage produced at the collector of the transistor 15 by the resistances 27 and 28 is applied to the 1st gate 4a of the FET21. When receiving the UHF, the power supply voltage is supplied to the drain 2b of the FET22 via the power supply voltage terminal 14b. In this case, the voltage for reception of UHF is applied to the emitter of the transistor 15 from the terminal 14b and via the resistance 38 and the diode 39.
JP782680A 1980-01-28 1980-01-28 Gain control circuit Granted JPS56106409A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP782680A JPS56106409A (en) 1980-01-28 1980-01-28 Gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP782680A JPS56106409A (en) 1980-01-28 1980-01-28 Gain control circuit

Publications (2)

Publication Number Publication Date
JPS56106409A true JPS56106409A (en) 1981-08-24
JPS6352484B2 JPS6352484B2 (en) 1988-10-19

Family

ID=11676392

Family Applications (1)

Application Number Title Priority Date Filing Date
JP782680A Granted JPS56106409A (en) 1980-01-28 1980-01-28 Gain control circuit

Country Status (1)

Country Link
JP (1) JPS56106409A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0321286U (en) * 1989-07-11 1991-03-01

Also Published As

Publication number Publication date
JPS6352484B2 (en) 1988-10-19

Similar Documents

Publication Publication Date Title
US3917964A (en) Signal translation using the substrate of an insulated gate field effect transistor
US3052853A (en) Attenuator for strong signals in a radio receiver
GB906939A (en) Automatic-gain-control system
JPS57115036A (en) Tuner device
JPS56106409A (en) Gain control circuit
JPS56164607A (en) Power amplifier
JPS54103601A (en) Uhf electronic tuner
JPS55104152A (en) Am stereo demodulation circuit
GB934475A (en) Adjustable level radio transmitter gain control
ATE9124T1 (en) MIXER CIRCUIT FOR A UHF/VHF TUNER WITH A DUAL GATE MOS FIELD EFFECT TRANSISTOR.
JPS57109433A (en) Frequency converting circuit
JPS60136410A (en) U-v switching circuit of electronic tuner
JPS5498114A (en) Vertical deflecting circuit
JPS57204612A (en) Varying circuit of frequency characteristic
JPS57180216A (en) Agc circuit for television receiver
JPS6134771Y2 (en)
SU1173499A1 (en) Circuit to control the phase of conductivity of switching transistor in devices supplied from the mains
JPS5710815A (en) Biasing circuit
JPS5464448A (en) Reception unit
KR850002432Y1 (en) Tuning voltage auto up-down circuit
JPS5553928A (en) Television tuner
GB948363A (en) Improvements in electronic apparatus
JPS57125532A (en) Television tuner circuit
JPS5652918A (en) Gain controlling circuit
GB877206A (en) Improvements in and relating to automatic gain control in transistor radio receivers