JPS5623009A - Gain control circuit and receiver using it - Google Patents

Gain control circuit and receiver using it

Info

Publication number
JPS5623009A
JPS5623009A JP9728879A JP9728879A JPS5623009A JP S5623009 A JPS5623009 A JP S5623009A JP 9728879 A JP9728879 A JP 9728879A JP 9728879 A JP9728879 A JP 9728879A JP S5623009 A JPS5623009 A JP S5623009A
Authority
JP
Japan
Prior art keywords
transistor
emitter
switching transistor
amplifying
control 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.)
Pending
Application number
JP9728879A
Other languages
Japanese (ja)
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 JP9728879A priority Critical patent/JPS5623009A/en
Publication of JPS5623009A publication Critical patent/JPS5623009A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/001—Digital control of analog signals

Landscapes

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

Abstract

PURPOSE:To obtain high practical sensitivity, by providing the DC bias set means to each emitter of a plurality of common-emitter amplifying transistors and providing the gain set wire resistor between the emitter and that of other transistor. CONSTITUTION:When the input signal level is small with the control of the switch control circuit 2, the 1st switching transistor Q1' only is turned on to operate the 1st amplifying transistor Q1 only. If the input level is greater than the specified value, the 2nd switching transistor Q2' only turns on in place of the 1st switching transistor Q1' and the operation is switched to that of the 2nd amplifying transistor Q2 only having the 1st linear emitter resistor RE1, and when the input level increases further, the 3rd switching transistor Q3' is on and the 3rd amplifying transistor Q3 only having the 2nd linear emitter resistor RE2 is operated.
JP9728879A 1979-08-01 1979-08-01 Gain control circuit and receiver using it Pending JPS5623009A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9728879A JPS5623009A (en) 1979-08-01 1979-08-01 Gain control circuit and receiver using it

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9728879A JPS5623009A (en) 1979-08-01 1979-08-01 Gain control circuit and receiver using it

Publications (1)

Publication Number Publication Date
JPS5623009A true JPS5623009A (en) 1981-03-04

Family

ID=14188310

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9728879A Pending JPS5623009A (en) 1979-08-01 1979-08-01 Gain control circuit and receiver using it

Country Status (1)

Country Link
JP (1) JPS5623009A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4833422A (en) * 1987-09-24 1989-05-23 Burr-Brown Corporation Programmable gain instrumentation amplifier

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5249324U (en) * 1975-10-06 1977-04-08

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5249324U (en) * 1975-10-06 1977-04-08

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4833422A (en) * 1987-09-24 1989-05-23 Burr-Brown Corporation Programmable gain instrumentation amplifier

Similar Documents

Publication Publication Date Title
GB1410606A (en) Signal selector circuit
GB1286069A (en) Analog to digital converter circuit
GB1446068A (en) Stabilization of quiescent collector potential of current-mode biased transistors-
JPS5623009A (en) Gain control circuit and receiver using it
GB1369699A (en) Turning device for radio receivers
GB1354040A (en) Analogue signal sorting circuit
GB1272655A (en) Wide-band amplifier
JPS5767305A (en) Limiter circuit
GB1215324A (en) A transistor a.c. amplifier circuit
US3510792A (en) Isolation and guarding circuit for minimizing drift in process control holding amplifier
JPS5746513A (en) Darlington complementary output circuit
JPS57129005A (en) Muting circuit
GB920723A (en) Amplifier circuit
JPS57125532A (en) Television tuner circuit
JPS5755605A (en) Differential amplifier
JPS5723311A (en) Amplifying circuit
JPS5739607A (en) Amplifier
JPH0249236U (en)
GB1047930A (en) Improvements in or relating to voltage comparing circuit arrangements
GB848921A (en) Improvements in or relating to amplitude limited amplifiers
JPS5494858A (en) Transistor base common amplifier circuit
GB1127268A (en) Improvements in or relating to d.c. amplifiers
GB897688A (en) Improvements in anti-deadband bias circuit for push-pull transistor amplifiers
KR790000626B1 (en) Gain cotrol circuit
GB1117334A (en) Variable gain amplifier circuit