公开(公告)号：US09685967B1

公开(公告)日：2017-06-20

申请号：US15259205

申请日：2016-09-08

Applicant: Infineon Technologies AG

Inventor： Mario Motz ,  Dan Stoica ,  Andrei Gheorghe

IPC: H03M1/06 ,  H03M3/00

CPC classification number: H03M3/356 ,  H03M3/34 ,  H03M3/464

Abstract: A ΣΔ ADC includes a forward path, a feedback path, and offset compensation circuitry. The forward path is configured to convert an analog input signal to a digital output signal and includes analog chopper circuitry configured to shift the analog input signal to a chopper frequency to generate a chopped analog signal. The feedback path includes a ΣΔ DAC configured to convert a digital offset compensation signal configured to compensate for offset error in the analog input signal to an analog feedback signal that is subtracted from a forward path signal. The offset compensation circuitry is configured to accumulate a chopped digital signal from the forward path to generate a digital offset error signal; add the digital offset error signal to the digital output signal to generate the digital offset compensation signal; and provide the digital offset compensation signal to the ΣΔ DAC.