Abstract
A third-order switched-capacitor sigma-delta A/D converter is presented. The converter consists of three cascaded first-order sigma-delta modulators, and achieves 88 dB pk/rms S/(N+D) in a 160-kHz passband with a 10.24-MHz sampling rate. The high signal-to-noise ratio is maintained over this wide bandwidth by attenuating the quantization noise with a third-order noise-shaping function and a fourth-order comb decimation filter. A special autozeroed integrator with low pole error is required to achieve the 10.24-MHz sampling rate and high-order noise shaping simultaneously. >
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