JPS5763911A - Receiver - Google Patents

Receiver

Info

Publication number
JPS5763911A
JPS5763911A JP13880380A JP13880380A JPS5763911A JP S5763911 A JPS5763911 A JP S5763911A JP 13880380 A JP13880380 A JP 13880380A JP 13880380 A JP13880380 A JP 13880380A JP S5763911 A JPS5763911 A JP S5763911A
Authority
JP
Japan
Prior art keywords
agc
trq2
reception
input signal
during
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
JP13880380A
Other languages
Japanese (ja)
Other versions
JPH0124365B2 (en
Inventor
Masanori Ienaka
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 JP13880380A priority Critical patent/JPS5763911A/en
Publication of JPS5763911A publication Critical patent/JPS5763911A/en
Publication of JPH0124365B2 publication Critical patent/JPH0124365B2/ja
Granted 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
    • H03G1/0017—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier
    • H03G1/0023—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier in emitter-coupled or cascode amplifiers

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE:To improve senitivity and high input signal characteristics by switching the impedance of a transistor, constituting an RF amplification stage, by a switching means controlled on the basis of the difference between a prescribed constant current and an AGC signal. CONSTITUTION:During the reception of a low input signal, an AGC current from a transistor TRQ10 is less than a constant current generated by a TRQ3, so a bias current corresponding to their difference flows through a TRQ2'. Therefore, the TRQ2' turns on to perform amplifying operation with the emitter grounded via a capacitor C105, improving the sensitivity. During the reception of an intermediate signal or greater, the AGC current becomes greater than the constant current generated by the TRQ3, so the TRQ2' turns off to give effect to amplifying operation by an amplifying TRQ1 having a resistance R1 at its emitter. During the reception of a high input signal, the collector potential of a TRQ10 rises as the AGC current increases, and the conductivity of a differential TRQ5 increases, thereby performing gain limiting operation by the differential TRs Q4 and Q5.
JP13880380A 1980-10-06 1980-10-06 Receiver Granted JPS5763911A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13880380A JPS5763911A (en) 1980-10-06 1980-10-06 Receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13880380A JPS5763911A (en) 1980-10-06 1980-10-06 Receiver

Publications (2)

Publication Number Publication Date
JPS5763911A true JPS5763911A (en) 1982-04-17
JPH0124365B2 JPH0124365B2 (en) 1989-05-11

Family

ID=15230592

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13880380A Granted JPS5763911A (en) 1980-10-06 1980-10-06 Receiver

Country Status (1)

Country Link
JP (1) JPS5763911A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007208373A (en) * 2006-01-31 2007-08-16 Sharp Corp Semiconductor integrated circuit device and tuner device using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007208373A (en) * 2006-01-31 2007-08-16 Sharp Corp Semiconductor integrated circuit device and tuner device using the same

Also Published As

Publication number Publication date
JPH0124365B2 (en) 1989-05-11

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