JPS5776906A - Signl switching and aplifying circuit - Google Patents

Signl switching and aplifying circuit

Info

Publication number
JPS5776906A
JPS5776906A JP55151359A JP15135980A JPS5776906A JP S5776906 A JPS5776906 A JP S5776906A JP 55151359 A JP55151359 A JP 55151359A JP 15135980 A JP15135980 A JP 15135980A JP S5776906 A JPS5776906 A JP S5776906A
Authority
JP
Japan
Prior art keywords
switching
resistor
capacitor
signal
trq
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
JP55151359A
Other languages
Japanese (ja)
Inventor
Yasunari Arafune
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP55151359A priority Critical patent/JPS5776906A/en
Publication of JPS5776906A publication Critical patent/JPS5776906A/en
Pending legal-status Critical Current

Links

Landscapes

  • Electronic Switches (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE: To achieve equivalent AC coupling and to suppress the increase in the number of pins, by applying a plurality of input signals to the base of a transistor (TR) through switching, and providing a series circuit of constant current source, resistor and capacitor between the emitter and ground.
CONSTITUTION: A plurality of input signals 11, 12 with different DC operating level are switched with a switching signal 14 at a switching stage 13 and applied to the base of a TRQ of an amplifying stage 15. A series circuit of a resistor R and a capacitor C and constant current source I is connected between the emitter of the TRQ and ground, and an output VO is obtained with a resistor RL connected to a power supply VCC. In this case, a resistance value R of the resistor R and a capacitance C of a capacitor C satisfy the relation of fSW≪1/2πCR≪fsignal, where fSW is the frequency of the switching signal 14 and fsignal is the frequency of unput signals 11, 12. Thus, equivalent AC coupling is substantially achieved, the flucutation in the DC operating point of input is not transmitted to the poststage and the transient effect can be prevented.
COPYRIGHT: (C)1982,JPO&Japio
JP55151359A 1980-10-30 1980-10-30 Signl switching and aplifying circuit Pending JPS5776906A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55151359A JPS5776906A (en) 1980-10-30 1980-10-30 Signl switching and aplifying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55151359A JPS5776906A (en) 1980-10-30 1980-10-30 Signl switching and aplifying circuit

Publications (1)

Publication Number Publication Date
JPS5776906A true JPS5776906A (en) 1982-05-14

Family

ID=15516813

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55151359A Pending JPS5776906A (en) 1980-10-30 1980-10-30 Signl switching and aplifying circuit

Country Status (1)

Country Link
JP (1) JPS5776906A (en)

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