Analog-To-Digital Converter With 3rd Order Noise Transfer Function
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United States of America
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Dec 12, 2024
app pub date -
Jun 12, 2023
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Jun 12, 2023
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Abstract
A VCO-Based Continuous-Time (CT) delta-sigma modulator (DSM) with a noise-shaping (NS) successive approximation register (SAR) quantizer for a 3rd order noise transfer function (NTF) is presented. An anti-aliasing filter (AAF) enables this new hybrid architecture. The 28 nm CMOS prototype NSQ VCO CTΣΔ achieves 84.2 dB SNDR and 86.8 dB DR within a 1 MHz bandwidth while consuming 1.62 mW at 100 MS/s. The core circuit occupies only 0.024 mm2. No calibration or coefficient tuning is required.
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