Sigma-delta type analog to digital converter with trimmed output and feedback

摘要

An analog signal is input to a converter where a feedback signal is subtracted to form an analog error signal. The analog error signal is then processed through a first quantizer to provide a course output bit. The difference between the input and output of the first quantizer is then processed through a second quantizer to provide a trim output bit. The two bits are combined and returned as the feedback signal and are provided to a decimation filter which will provide the digital output representation of the analog input.