期刊
IEEE JOURNAL OF SOLID-STATE CIRCUITS
卷 56, 期 12, 页码 3668-3680出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2021.3108620
关键词
Delta Sigma modulator; analog-to-digital converter (ADC); dynamic amplifier; floating inverter amplifier; noise cancellation; noise shaping; successive approximation register (SAR)
This article presents an NS-SAR ADC that tackles the key bottlenecks of high-order loop filter and thermal noise using innovative structures and techniques, achieving excellent performance.
To design noise-shaping successive approximation register (NS-SAR) analog-to-digital converters (ADCs) with high resolution and good power efficiency, two key bottlenecks need to be addressed. One is to realize a high-order loop filter with low circuit overhead, and the other is to mitigate the thermal noise. This article presents an NS-SAR ADC that synergistically addresses both challenges. To achieve high-order efficiency, it proposes an innovative error feedback-cascaded integrator feedforward (EF-CIFF) structure that realizes third-order noise shaping using only a single amplifier. It combines the merits of both structures, showing improved robustness, and is free of dc offset concern. On reducing the kT/C noise, this work features a sampling kT/C noise cancellation (SNC) technique that reuses the native hardware of the EF-CIFF structure. An open-loop self-quenching floating-inverter dynamic amplifier (FIDA) is used to support all amplification with low noise and power. Prototyped in 65-nm CMOS, this work achieves 84.8-dB signal-to-noise-distortion ratio (SNDR) with 625-kHz bandwidth (BW) (OSR = 8) and 119 mu W, leading to 182-dB Schreier Figure of Merit (FoM). It uses only 0.8-pF input capacitance, which is 5x smaller than prior NS-SAR ADCs with similar oversampling ratio (OSR) and SNDR.
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