Abstract
A multibit delta-sigma audio stereo analog-to-digital converter has been developed. It employs a fifth-order single-loop 17-level delta-sigma modulator with an input feedforward gain stage. A second-order mismatch shaping (DEM) circuit is utilized to remove tones and nonlinearities caused by capacitor mismatch of the feedback digital-to-analog converter. The implementation of the DEM block introduces minimum latency into the delta-sigma feedback loop. Chopper stabilization is applied to the first integrator to eliminate the 1/f noise. The converter achieves 114-dB dynamic range and -105-dB total harmonic distortion over the 20-kHz audio band. This single chip includes stereo analog modulators, bandgap reference, serial interface, and a two-stage decimation filter, occupies 5.62-mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> active area in a 0.35-μm double-poly, three-metal CMOS process and dissipates only 55-mW power in the analog circuits.
Published Version
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