JPS5593310A - High frequency amplifier - Google Patents

High frequency amplifier

Info

Publication number
JPS5593310A
JPS5593310A JP274479A JP274479A JPS5593310A JP S5593310 A JPS5593310 A JP S5593310A JP 274479 A JP274479 A JP 274479A JP 274479 A JP274479 A JP 274479A JP S5593310 A JPS5593310 A JP S5593310A
Authority
JP
Japan
Prior art keywords
attenuation circuit
high frequency
attenuation
circuit
frequency signal
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
JP274479A
Other languages
Japanese (ja)
Inventor
Masaaki Katsumi
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.)
Maspro Denkoh Corp
Original Assignee
Maspro Denkoh 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 Maspro Denkoh Corp filed Critical Maspro Denkoh Corp
Priority to JP274479A priority Critical patent/JPS5593310A/en
Publication of JPS5593310A publication Critical patent/JPS5593310A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
    • H03G1/0052—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using diodes
    • 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
    • H03G3/3057—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 using at least one diode as controlling device

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To output the signal of good quality regardless of the electric field strength, by suitably controlling the attenuation of the attenuation circuit provided at the input and output side of the amplifying circuit with one varying means. CONSTITUTION:The high frequency signal incoming to the input terminal 4 via the feeding line 2a from the antenna 1 is outputted to the output terminal 5 via the first attenuation circuit 6, amplifying circuit 7 and second attenuation circuit 8 and fed to the television receiver 14 via the feeding line 2b. The impedance of the diodes D1,D2 connected in each attenuation circuit is mutually controlled to reverse direction depending on the change in the voltage value appeared at the control terminals 9a,9b with the operation of one variable resistor VR1. That is, when the knob 10' is selected to the weak position, the incoming high frequency signal is mainly attenuated at the attenuation circuit 8 at the output side, and if the knob 10' is selected to the strong position, and incoming high frequency signal is mainly attenuated at the attenuation circuit 6 at the input side.
JP274479A 1979-01-10 1979-01-10 High frequency amplifier Pending JPS5593310A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP274479A JPS5593310A (en) 1979-01-10 1979-01-10 High frequency amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP274479A JPS5593310A (en) 1979-01-10 1979-01-10 High frequency amplifier

Publications (1)

Publication Number Publication Date
JPS5593310A true JPS5593310A (en) 1980-07-15

Family

ID=11537851

Family Applications (1)

Application Number Title Priority Date Filing Date
JP274479A Pending JPS5593310A (en) 1979-01-10 1979-01-10 High frequency amplifier

Country Status (1)

Country Link
JP (1) JPS5593310A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5124219A (en) * 1974-08-23 1976-02-27 Kawai Musical Instr Mfg Co
JPS5325628A (en) * 1976-08-20 1978-03-09 Tashk Ni I Puroekutonui I Suto Cement and method of manufacturing thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5124219A (en) * 1974-08-23 1976-02-27 Kawai Musical Instr Mfg Co
JPS5325628A (en) * 1976-08-20 1978-03-09 Tashk Ni I Puroekutonui I Suto Cement and method of manufacturing thereof

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