Continuous-Time Delta-Sigma Modulators for High-Speed A/D Conversion: Theory, Practice and Fundamental Performance Limits

Among analog—to—digital converters, the delta—sigma modulator has cornered the market on high to very high resolution converters at moderate speeds, with typical applications such as digital audio and instrumentation. Interest has recently increased in delta—sigma circuits built with a continuous—time loop filter rather than the more common switched—capacitor approach. Continuous—time delta—sigma modulators offer less noisy virtual ground nodes at the input, inherent protection against sign...