Patent ID: 8004444

Claim:
An integrated circuit analog to digital converter comprising: A. differential input signals; B. differential summing junctions; C. first transconductor circuitry having inputs connected with the differential summing junction and having differential outputs; D. quantization circuitry having inputs connected to the differential outputs of the first transconductor circuitry and having an output coupled with the differential summing junction; and E. chopping transconductor circuitry including: i. first chopper circuitry having inputs coupled to the differential input signals and having differential outputs; ii. a pair of first cascode transistors, each first cascode transistor having a drain and a source connected between a differential output of the first chopper circuitry and a differential summing junction; iii. second chopper circuitry having inputs coupled to a source voltage and having differential outputs; and iv. a pair of second cascode transistors, each second cascode transistor having a drain and a source connected between a differential output of the second chopper circuitry and the differential summing junction.