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Dive into the research topics where Kohji Yoshii is active.

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Featured researches published by Kohji Yoshii.


ieee international conference on solid state and integrated circuit technology | 2016

Analysis and design of operational amplifier stability based on Routh-Hurwitz method

JianLong Wang; Gopal Adhikari; Haruo Kobayashi; Nobukazu Tsukiji; Vlayu Hirano; Keita Kurihara; Akihito Nagahama; Ippei Noda; Kohji Yoshii

This paper proposes to use Routh-Hurwitz stability criterion for analysis and design of the opamp stability, when its small equivalent circuit is derived; this can lead to explicit stability condition derivation for opamp circuit parameters, and this is very effective especially for multi-stage opamps. The proposed method has been verified by two two-pole amplifiers with theoretical analysis and SPICE simulations, as examples.


Archive | 2005

Constant voltage circuit

Toshihisa Nagata; Kohji Yoshii; Yusuke Minakuchi


Archive | 2000

Constant voltage power supply with normal and standby modes

Shinya Manabe; Kohji Yoshii


Archive | 2003

Power supplying methods and apparatus that provide stable output voltage

Hideki Agari; Hirohisa Abe; Kohji Yoshii


Archive | 2002

Voltage regulator using two operational amplifiers in current consumption

Hideki Agari; Kohji Yoshii


Archive | 2005

Voltage regulator with plural error amplifiers

Toshihisa Nagata; Kohji Yoshii; Yusuke Minakuchi


Archive | 2006

Transistor drive circuit, constant voltage circuit, and method thereof using a plurality of error amplifying circuits to effectively drive a power transistor

Katsuhiro Hayashi; Kohji Yoshii


Archive | 2005

Semiconductor Device and Voltage Regulator Using the Semiconductor Device

Toshihisa Nagata; Kohji Yoshii


Archive | 2003

Power supply IC having switching regulator and series regulator

Hideki Agari; Kohji Yoshii


Archive | 2012

Transistor drive circuit, constant voltage circuit, and method thereof using a plurality of error amplifying circuits

Kohji Yoshii; Katsuhiro Hayashi

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