Finnegan, Henderson, Farabow, Garrett & Dunner
Operational amplifier
 An operational amplifier is provided with a differential amplifier constructed by MOS transistors and a linear amplifier constructed by MOS transistors and coupled with the differential amplifier. The differential amplifier is supplied with first and second inputs. The output of the operational amplifier is derived from the output of the linear amplifier. A stabilizing circuit, which is coupled with the differential and linear amplifiers, stabilizes the output of the operational amplifier against a variation of the input DC levels to the differential amplifier. 
Tokyo Shibaura Denki Kabushiki Kaisha
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Yasoji Tetsuya Chikara
Suzuki Iida Sato