Patent ID: 6236270
Filing Date: 2001-05-22
Classification: H03F

Abstract:
An operational amplifier circuit comprising:a first transistor of a first conductivity type having a first control gate supplied with a first input voltage and a first current path coupled between a first node and a second node;a second transistor of said first conductivity type having a second control gate supplied with a second input voltage and a second current path coupled between said first node and a third node;a third transistor of a second conductivity type having a third control gate and a third current path coupled between said third node and a fourth node;a fourth transistor of said second conductivity type having a fourth control gate coupled to said third control gate and a fourth current path coupled between said second node and a fifth node;a fifth transistor of said first conductivity type having a fifth control gate and a fifth current path coupled between said fourth node and a sixth node;a sixth transistor of said first conductive type having a sixth control gate coupled to said fifth control gate and having a sixth current path coupled between said fifth node and seventh node;a current mirror circuit having an input node coupled to said sixth node and an output node coupled to said seventh node; anda seventh transistor of said second conductive type having a seventh control gate coupled to said seventh node.