DIGITAL-DOMAIN DITHERING OF SIGMA-DELTA MODULATORS USING BIT FLIPPING

A new technique is presented for dithering single-bit sigma-delta modu lator (SDM) analog-to-digital and digital-to-analog converters (ADCs a nd DACs) in the digital domain. The system operates by detecting and r andomizing the limit cycles responsible for baseband tones. The system is efficient to realize in hardware and avoids the implementation pro blems of analog dither required in conventional SDM ADCs.