Patent ID: 6781450
Filing Date: 2004-08-24
Classification: H03F

Abstract:
An auto-zero amplifier circuit, comprising:a differential input stage having a first input, a second input, a first output and a second output, wherein the inputs of the differential input stage are substantially the same during an auto-zero phase; a current mirror circuit having a first port that is coupled to the first output of the differential input stage, and a second port that is coupled to the second output of the differential input stage; a differential correction circuit having a first port, a second port, and a third port, wherein the first port of the differential correction circuit is coupled to the first port of the current mirror circuit, the third port of the differential correction circuit is coupled to the second port of the current mirror circuit; a voltage stabilizer circuit having a first port that is coupled to the second port of the differential correction circuit and a second port that is coupled to the first port of the differential correction circuit; a first switch circuit comprising a first switch that is coupled between a first node and the first output of the differential input stage, wherein the first switch circuit is closed during an amplification phase and open during the auto-zero phase; a first capacitance circuit that is coupled to the first node; and a second capacitance circuit that is coupled to a second node.