A 22-KHZ MULTIBIT SWITCHED-CAPACITOR SIGMA-DELTA D A CONVERTER WITH 92 DB DYNAMIC-RANGE/

time and capacitor-multiplexing technique for use in a highly linear s witched-capacitor multibit DAC in sigma-delta data converters is prese nted. The technique uses subintervals in the sample clock to deliver m ultiple charge packets to holding capacitors. It avoids distortion eff ects caused by mismatched capacitors and finite opamp gain, A five-lev el switched-capacitor DAC using the proposed technique was designed as part of an audio-band multibit sigma-delta D/A converter that achieve d a dynamic range of 92 dB and a THD of -94 dB with a low oversampling ratio of 32. No trimming, calibration, or dynamic matching scheme was required. The five-level SC DAC has been fabricated in a 2-mu m CMOS process, and testing confirmed the anticipated theoretical results.