JPS55123237A - Switching circuit of differential amplifier - Google Patents

Switching circuit of differential amplifier

Info

Publication number
JPS55123237A
JPS55123237A JP2935679A JP2935679A JPS55123237A JP S55123237 A JPS55123237 A JP S55123237A JP 2935679 A JP2935679 A JP 2935679A JP 2935679 A JP2935679 A JP 2935679A JP S55123237 A JPS55123237 A JP S55123237A
Authority
JP
Japan
Prior art keywords
control input
differential amplifier
trq3
saturated
voltage
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
JP2935679A
Other languages
Japanese (ja)
Inventor
Hitoshi Fujisaki
Hideo Onodera
Yasuhiro Toyomura
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.)
Kokusai Denki Electric Inc
Original Assignee
Hitachi Denshi KK
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 Denshi KK filed Critical Hitachi Denshi KK
Priority to JP2935679A priority Critical patent/JPS55123237A/en
Priority to US06/090,147 priority patent/US4284912A/en
Publication of JPS55123237A publication Critical patent/JPS55123237A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
    • H03K17/603—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors with coupled emitters

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To prevent noises from being generated by connecting switching Tr's of the reverse conduction type in parallel to transistors Tr constituting a differential amplifier, and then stopping the collector currents of those Tr's from being saturated. CONSTITUTION:A differential amplifier is composed of NPN type Tr's Q1 and Q2 and PNPTr's Q4 and Q5 of the reverse conduction type are connected in parallel. Then, supplying more than a voltage equivalent to power supply Vcc to bases of Tr's Q4 and Q5 via control input CT1 makes differential amplifiers TrQ1 and Q2 generate output signal at their outputs OUT1 and OUT2 corresponding to a voltage difference between inputs IN1 and IN2. The supply of a low-voltage switching signal to control input CT1 turns Tr's Q4 and Q5 ON and the signals of OUT1 and OUT2 disappear, providing switching operation. In this case, a fixed forward bias is applied to control input CT2, TrQ3 operates as a constant current circuit, and collector currents of Q4 and Q5 flow into TrQ3, cutting off Tr's Q1 and Q2. Then, Tr's Q4 and Q5 are stopped from being saturated by applying a forward bias to control input CT3 of TrQ6, thereby reducing the generation of noises.
JP2935679A 1978-11-09 1979-03-15 Switching circuit of differential amplifier Pending JPS55123237A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2935679A JPS55123237A (en) 1979-03-15 1979-03-15 Switching circuit of differential amplifier
US06/090,147 US4284912A (en) 1978-11-09 1979-11-01 Switching circuits for differential amplifiers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2935679A JPS55123237A (en) 1979-03-15 1979-03-15 Switching circuit of differential amplifier

Publications (1)

Publication Number Publication Date
JPS55123237A true JPS55123237A (en) 1980-09-22

Family

ID=12273914

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2935679A Pending JPS55123237A (en) 1978-11-09 1979-03-15 Switching circuit of differential amplifier

Country Status (1)

Country Link
JP (1) JPS55123237A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5996940U (en) * 1982-12-09 1984-06-30 日本ビクター株式会社 switching circuit
JPS60185426A (en) * 1984-03-02 1985-09-20 Fujitsu Ltd Analog switch circuit
JPH04106653U (en) * 1991-02-26 1992-09-14 高砂熱学工業株式会社 Dripping nozzle for watering

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5996940U (en) * 1982-12-09 1984-06-30 日本ビクター株式会社 switching circuit
JPS60185426A (en) * 1984-03-02 1985-09-20 Fujitsu Ltd Analog switch circuit
JPH04106653U (en) * 1991-02-26 1992-09-14 高砂熱学工業株式会社 Dripping nozzle for watering

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