JPS6432709A - Constant current source circuit - Google Patents

Constant current source circuit

Info

Publication number
JPS6432709A
JPS6432709A JP62187579A JP18757987A JPS6432709A JP S6432709 A JPS6432709 A JP S6432709A JP 62187579 A JP62187579 A JP 62187579A JP 18757987 A JP18757987 A JP 18757987A JP S6432709 A JPS6432709 A JP S6432709A
Authority
JP
Japan
Prior art keywords
current source
constant current
current
anode
diode
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
JP62187579A
Other languages
Japanese (ja)
Inventor
Hiroaki Nanbu
Kunihiko Yamaguchi
Kazuo Kanetani
Kenichi Ohata
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
Hitachi Consumer Electronics Co Ltd
Japan Display Inc
Original Assignee
Hitachi Device Engineering Co Ltd
Hitachi Ltd
Hitachi Consumer Electronics 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 Hitachi Device Engineering Co Ltd, Hitachi Ltd, Hitachi Consumer Electronics Co Ltd filed Critical Hitachi Device Engineering Co Ltd
Priority to JP62187579A priority Critical patent/JPS6432709A/en
Publication of JPS6432709A publication Critical patent/JPS6432709A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To control the current value of a constant current source by means of an external impressed voltage and to cause a testing to be efficient by connecting the series circuit of two resistances to the anode of a diode and connecting the base of a transistor to the anode of the diode to control a current value of a constant source current by the external impressing voltage. CONSTITUTION:To the anode of a diode D1, a circuit, composed of two series- connected resistances R1 and R2, is connected. When the constant current source to supply Ib=1.5mA is designed, provided that R1=2.702KOMEGA, R2=0.270KOMEGA, a voltage V1 of nodes between the resistance R1 and R2 does to be V1=1.147V. When the current Ib=1.5mA is controlled from the outside and changed to a two-fold designed value (Ib=3.0mA), since Vbe=Vd=760mA and R2=0.270KOMEGA, V1=1.570V may be executed.
JP62187579A 1987-07-29 1987-07-29 Constant current source circuit Pending JPS6432709A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62187579A JPS6432709A (en) 1987-07-29 1987-07-29 Constant current source circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62187579A JPS6432709A (en) 1987-07-29 1987-07-29 Constant current source circuit

Publications (1)

Publication Number Publication Date
JPS6432709A true JPS6432709A (en) 1989-02-02

Family

ID=16208576

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62187579A Pending JPS6432709A (en) 1987-07-29 1987-07-29 Constant current source circuit

Country Status (1)

Country Link
JP (1) JPS6432709A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003008350A (en) * 2001-06-19 2003-01-10 Takehiko Adachi Piezoelectric oscillator

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58119014A (en) * 1982-01-11 1983-07-15 Matsushita Electric Ind Co Ltd Power source device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58119014A (en) * 1982-01-11 1983-07-15 Matsushita Electric Ind Co Ltd Power source device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003008350A (en) * 2001-06-19 2003-01-10 Takehiko Adachi Piezoelectric oscillator

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