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JPS5690609A - Offset circuit - Google Patents

Offset circuit

Info

Publication number
JPS5690609A
JPS5690609A JP16854179A JP16854179A JPS5690609A JP S5690609 A JPS5690609 A JP S5690609A JP 16854179 A JP16854179 A JP 16854179A JP 16854179 A JP16854179 A JP 16854179A JP S5690609 A JPS5690609 A JP S5690609A
Authority
JP
Japan
Prior art keywords
input side
transistor
transistors
offset circuit
differential couple
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
JP16854179A
Other languages
Japanese (ja)
Inventor
Shuichi Kato
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 JP16854179A priority Critical patent/JPS5690609A/en
Publication of JPS5690609A publication Critical patent/JPS5690609A/en
Pending legal-status Critical Current

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  • Amplifiers (AREA)

Abstract

PURPOSE: To prevent fluctuations of an output point potential due to temperature by adding an emitter follower transistor with a constant voltage source at the input side of a differential couple of transistors for an offset circuit.
CONSTITUTION: Feedback is provided from input side collectors of a differential couple of transistors Q31 and Q32 of offset circuit OS21 to input side bases so that variable resistance VR11 can be adjusted via emitter follower transistor Q34, eliminating currents flowing from input side collectors. Consequently, the current amplification factor between transistor Q21 closer to the input side between the differential couple of transistors Q21 and Q22 of input stage 21 and transistor Q31 closer to the input side between the differential couple of transistors Q31 and Q32 of offset circuit OS21 is varied to prevent the collector current of transistor Q31 from fluctuating, and further this can be equalized in density to the collector current of transistor Q21.
COPYRIGHT: (C)1981,JPO&Japio
JP16854179A 1979-12-25 1979-12-25 Offset circuit Pending JPS5690609A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16854179A JPS5690609A (en) 1979-12-25 1979-12-25 Offset circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16854179A JPS5690609A (en) 1979-12-25 1979-12-25 Offset circuit

Publications (1)

Publication Number Publication Date
JPS5690609A true JPS5690609A (en) 1981-07-22

Family

ID=15869920

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16854179A Pending JPS5690609A (en) 1979-12-25 1979-12-25 Offset circuit

Country Status (1)

Country Link
JP (1) JPS5690609A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0226113A (en) * 1988-07-14 1990-01-29 Rohm Co Ltd Gain variable amplifier
JPH0227808A (en) * 1988-07-16 1990-01-30 Rohm Co Ltd Gain variable amplifier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0226113A (en) * 1988-07-14 1990-01-29 Rohm Co Ltd Gain variable amplifier
JPH0227808A (en) * 1988-07-16 1990-01-30 Rohm Co Ltd Gain variable amplifier

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