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JPS57192114A - Current mirror circuit - Google Patents

Current mirror circuit

Info

Publication number
JPS57192114A
JPS57192114A JP56076531A JP7653181A JPS57192114A JP S57192114 A JPS57192114 A JP S57192114A JP 56076531 A JP56076531 A JP 56076531A JP 7653181 A JP7653181 A JP 7653181A JP S57192114 A JPS57192114 A JP S57192114A
Authority
JP
Japan
Prior art keywords
current
trsq
current mirror
mirror circuit
constant
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
JP56076531A
Other languages
Japanese (ja)
Inventor
Kunio Seki
Kenji Horiuchi
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 JP56076531A priority Critical patent/JPS57192114A/en
Publication of JPS57192114A publication Critical patent/JPS57192114A/en
Pending legal-status Critical Current

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  • Amplifiers (AREA)

Abstract

PURPOSE: To improve the high speed response, by providing a speed-up capacitor in parallel with an emitter resistor of an output side transistor (TR) in a current mirror circuit.
CONSTITUTION: A triangle wave is formed by alternately flowing constant currents I0 and I0' to a capacitor C2. This current I0 is formed through a current mirror circuit consisting of TRsQ1 and Q2 receiving a current signal switching the constant current I0 with switch S1. On the other hand, the current I0' is formed through a current mirror circuit consisting of TRsQ1' and Q2' receiving a current signal switching the constant current source I0' with a switch S1'. In the current mirror circuits, speed-up capacitors C1 and C1' are respectively provided in parallel with emitter resistors R2 and R2' of output TRsQ2 and Q2'. With the constitution like this, when the TRsQ2 and Q2' are switched from turning-off to turning-on, the formed bias voltage can be determined immediately by flowing the currents I0 and I0' to the TRsQ1 and Q1', allowing to improve the response.
COPYRIGHT: (C)1982,JPO&Japio
JP56076531A 1981-05-22 1981-05-22 Current mirror circuit Pending JPS57192114A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56076531A JPS57192114A (en) 1981-05-22 1981-05-22 Current mirror circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56076531A JPS57192114A (en) 1981-05-22 1981-05-22 Current mirror circuit

Publications (1)

Publication Number Publication Date
JPS57192114A true JPS57192114A (en) 1982-11-26

Family

ID=13607857

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56076531A Pending JPS57192114A (en) 1981-05-22 1981-05-22 Current mirror circuit

Country Status (1)

Country Link
JP (1) JPS57192114A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02256306A (en) * 1989-09-06 1990-10-17 Rohm Co Ltd Current mirror circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5335350A (en) * 1976-09-13 1978-04-01 Hitachi Ltd Current mirror circuit
JPS5335350B2 (en) * 1974-03-29 1978-09-26

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5335350B2 (en) * 1974-03-29 1978-09-26
JPS5335350A (en) * 1976-09-13 1978-04-01 Hitachi Ltd Current mirror circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02256306A (en) * 1989-09-06 1990-10-17 Rohm Co Ltd Current mirror circuit

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