JPH03278708A - Gain variable type amplifier circuit - Google Patents

Gain variable type amplifier circuit

Info

Publication number
JPH03278708A
JPH03278708A JP7961490A JP7961490A JPH03278708A JP H03278708 A JPH03278708 A JP H03278708A JP 7961490 A JP7961490 A JP 7961490A JP 7961490 A JP7961490 A JP 7961490A JP H03278708 A JPH03278708 A JP H03278708A
Authority
JP
Japan
Prior art keywords
amplifier circuit
resistor
circuit
resistors
collector
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
JP7961490A
Other languages
Japanese (ja)
Other versions
JP2691632B2 (en
Inventor
Masato Sakui
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2079614A priority Critical patent/JP2691632B2/en
Publication of JPH03278708A publication Critical patent/JPH03278708A/en
Application granted granted Critical
Publication of JP2691632B2 publication Critical patent/JP2691632B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE: To reduce number of circuit components by providing a control terminal receiving an input signal, a transistor(TR) having 1st and 2nd conductor terminals and a control element varying a current flowing between the 2nd conductor terminal and a 2nd voltage source and extracting an output signal from the 1st conductor terminal.
CONSTITUTION: An amplifier circuit 1 is provided with an NPN TR Q1 whose emitter connects to ground via a resistor R1, a resistor R3 provided between a collector of the TR Q1 and a power supply Vcc, series connection of resistors R1, R2 provided between the power supply Vcc and ground to provide a bias voltage to a base of the TR Q1 and a coupling capacitor C1. The connecting point between the resistors R1 and R2 connects to a base of the TR Q1 and the capacitor C1. An output signal of the amplifier circuit 1 is extracted from the collector of the TR Q1. Thus, the circuit is formed by having only to connect one TR to a common emitter amplifier circuit via a resistor and the number of circuit components is reduced.
COPYRIGHT: (C)1991,JPO&Japio
JP2079614A 1990-03-28 1990-03-28 Variable gain type amplifier circuit Expired - Lifetime JP2691632B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2079614A JP2691632B2 (en) 1990-03-28 1990-03-28 Variable gain type amplifier circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2079614A JP2691632B2 (en) 1990-03-28 1990-03-28 Variable gain type amplifier circuit

Publications (2)

Publication Number Publication Date
JPH03278708A true JPH03278708A (en) 1991-12-10
JP2691632B2 JP2691632B2 (en) 1997-12-17

Family

ID=13694928

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2079614A Expired - Lifetime JP2691632B2 (en) 1990-03-28 1990-03-28 Variable gain type amplifier circuit

Country Status (1)

Country Link
JP (1) JP2691632B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008126282A1 (en) * 2007-03-30 2008-10-23 Fujitsu Limited Amplifier circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4721542U (en) * 1971-03-19 1972-11-10
JPS52148029U (en) * 1976-05-06 1977-11-09
JPS61230506A (en) * 1985-04-05 1986-10-14 Fujitsu Ltd Variable gain amplifier circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4721542U (en) * 1971-03-19 1972-11-10
JPS52148029U (en) * 1976-05-06 1977-11-09
JPS61230506A (en) * 1985-04-05 1986-10-14 Fujitsu Ltd Variable gain amplifier circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008126282A1 (en) * 2007-03-30 2008-10-23 Fujitsu Limited Amplifier circuit
US8283980B2 (en) 2007-03-30 2012-10-09 Fujitsu Limited Amplifier circuit

Also Published As

Publication number Publication date
JP2691632B2 (en) 1997-12-17

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