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JPS6444517A - Constant current source circuit - Google Patents

Constant current source circuit

Info

Publication number
JPS6444517A
JPS6444517A JP19984887A JP19984887A JPS6444517A JP S6444517 A JPS6444517 A JP S6444517A JP 19984887 A JP19984887 A JP 19984887A JP 19984887 A JP19984887 A JP 19984887A JP S6444517 A JPS6444517 A JP S6444517A
Authority
JP
Japan
Prior art keywords
base
frequency
circuit
constant current
current
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
JP19984887A
Other languages
Japanese (ja)
Inventor
Hideaki Takada
Yoshimi Iso
Haruyuki Inohana
Masami Tsuchida
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
Pioneer Corp
Original Assignee
Hitachi Ltd
Pioneer Electronic 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 Hitachi Ltd, Pioneer Electronic Corp filed Critical Hitachi Ltd
Priority to JP19984887A priority Critical patent/JPS6444517A/en
Publication of JPS6444517A publication Critical patent/JPS6444517A/en
Pending legal-status Critical Current

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  • Control Of Electrical Variables (AREA)

Abstract

PURPOSE:To stably generate a constant current without generating oscillation by reducing cut-off frequency in the frequency characteristics of a base current compensating circuit in a current mirror circuit. CONSTITUTION:A constant current source 5 and a base current compensating circuit 9 are connected to the current mirror circuit consisting of transistors (TRs) 1, 2 and feedback loop is constituted of the base and collector of the TR1 and the base and emitter of a TR 3 in the circuit 9 and a feedback loop is constituted of the base and collector of the TR 1 and the base and emitter of a TR 3 in the circuit 9. Since a resistor 8 and a capacitor 7 are connected to the TR 3, the cut-off frequency of frequency characteristics of the circuit 9 is sufficiently reduced as compared with the cut-off frequency of current amplification of the TR 1. Consequently, the open loop characteristics of the feedback look can be set up to a value less than gain 1 in the frequency with 360 deg. phase delay. Consequently, a constant current can be stably generated without generating oscillation.
JP19984887A 1987-08-12 1987-08-12 Constant current source circuit Pending JPS6444517A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19984887A JPS6444517A (en) 1987-08-12 1987-08-12 Constant current source circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19984887A JPS6444517A (en) 1987-08-12 1987-08-12 Constant current source circuit

Publications (1)

Publication Number Publication Date
JPS6444517A true JPS6444517A (en) 1989-02-16

Family

ID=16414654

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19984887A Pending JPS6444517A (en) 1987-08-12 1987-08-12 Constant current source circuit

Country Status (1)

Country Link
JP (1) JPS6444517A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03145809A (en) * 1989-10-31 1991-06-21 Nec Corp High dielectric strength driving circuit
JP2007065996A (en) * 2005-08-31 2007-03-15 Denso Corp Current mirror circuit and constant current circuit
US7498868B2 (en) 2005-08-05 2009-03-03 Denso Corporation Current mirror circuit and constant current circuit having the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03145809A (en) * 1989-10-31 1991-06-21 Nec Corp High dielectric strength driving circuit
US7498868B2 (en) 2005-08-05 2009-03-03 Denso Corporation Current mirror circuit and constant current circuit having the same
US7551003B2 (en) * 2005-08-05 2009-06-23 Denso Corporation Current mirror circuit and constant current circuit having the same
JP2007065996A (en) * 2005-08-31 2007-03-15 Denso Corp Current mirror circuit and constant current circuit

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