JPH01303807A - Power circuit - Google Patents

Power circuit

Info

Publication number
JPH01303807A
JPH01303807A JP63132655A JP13265588A JPH01303807A JP H01303807 A JPH01303807 A JP H01303807A JP 63132655 A JP63132655 A JP 63132655A JP 13265588 A JP13265588 A JP 13265588A JP H01303807 A JPH01303807 A JP H01303807A
Authority
JP
Japan
Prior art keywords
transistor
diode
base
emitter
resistance
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
JP63132655A
Other languages
Japanese (ja)
Inventor
Masakata Eto
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 JP63132655A priority Critical patent/JPH01303807A/en
Publication of JPH01303807A publication Critical patent/JPH01303807A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To realize a power circuit due to the logarithm-antilogarithm operation with a simple constitution and to facilitate the correction by combining a resistance and a diode to a current mirror circuit.
CONSTITUTION: A transistor 3 connects a base collector, uses it as a diode, an emitter is connected through a diode 7 to a power source and the base collector is connected to the base of a transistor 4. The emitter of the transistor 4 is connected through a power source 8 of a potential difference Vγ2 to a power source 100 and a collector is grounded through a resistance 5. A current Ii in proportion to an input signal level flows at the diode composed of a first transistor 3, a proportion coefficient γ is multiplied to a generated base emitter voltage VBE2 change, coupled to a base emitter voltage VBE2 of a second transistor 4 and in accordance with the VBE2 change, an emitter current IE2 of the second transistor 4 flows. Thus, only by combining the current mirror circuit diode 7 and the resistance 5, the power circuit can be constituted, and the γcorrection of the video signal can be executed inexpensively, compactly and easily.
COPYRIGHT: (C)1989,JPO&Japio
JP63132655A 1988-06-01 1988-06-01 Power circuit Pending JPH01303807A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63132655A JPH01303807A (en) 1988-06-01 1988-06-01 Power circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63132655A JPH01303807A (en) 1988-06-01 1988-06-01 Power circuit

Publications (1)

Publication Number Publication Date
JPH01303807A true JPH01303807A (en) 1989-12-07

Family

ID=15086401

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63132655A Pending JPH01303807A (en) 1988-06-01 1988-06-01 Power circuit

Country Status (1)

Country Link
JP (1) JPH01303807A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7310093B2 (en) 2003-02-28 2007-12-18 Seiko Epson Corporation Current generating circuit, electro-optical apparatus, and electronic unit
WO2013065401A1 (en) * 2011-11-04 2013-05-10 シャープ株式会社 Power amplifying circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7310093B2 (en) 2003-02-28 2007-12-18 Seiko Epson Corporation Current generating circuit, electro-optical apparatus, and electronic unit
WO2013065401A1 (en) * 2011-11-04 2013-05-10 シャープ株式会社 Power amplifying circuit
JP2013098904A (en) * 2011-11-04 2013-05-20 Sharp Corp Power amplification circuit

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