Chan-Hsiang Weng, Tzu-An Wei, Hung-Yi Hsieh, Su-Hao Wu, Ting-Yang Wang
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A 71. 4dB SNDR 30MHz BW Continuous-Time Delta-sigma Modulator Using a Time-Interleaved Noise-Shaping Quantizer in 12-nm CMOS
This work presents a continuous-time delta-sigma modulator (CTDSM) using a time-interleaved noise-shaping quantizer targeted for wireless communication system application. A quantization error duplication method enables the SAR-based quantizer to implement noise-shaping and operate at an 832MHz sampling frequency concurrently. Through the use of a CRFB loop filter topology and the noise-shaping quantizer, the proposed CTDSM achieves 71.4 dB SNDR in 30-MHz BW without STF peaking. The FoMs and FoMw are 171 dB and 17.6 fJ/conv.-step, respectively.
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