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本文提出一种4阶噪声整形SAR ADC，采用动态放大器辅助级联积分器实现高阶噪声整形，在94.3dB SNDR下达到184dB FoMs，适用于音频IoT应用。该设计解决了高阶噪声传递函数、功率效率和PVT鲁棒性之间的权衡问题。
Upbeat Technology, Taipei, Taiwan 1 2 The noise-shaping (NS) SAR ADC, which features the advantages of sigma-delta ADCs and SAR ADCs, is high accuracy and low power, so it stands out as a great choice for audio applications of IoT devices. Attaining high-performance and high-yield in an NSSAR ADC is challenging due to the requirements of meeting a high-order noise transfer function (NTF), power efficiency, and robustness across PVT variations at the same time. The error-feedback (EF) structure implements FIR filters with multi-cycle delays [1], which simplifies implementation but makes NTF coefficients sensitive to gain variation. Therefore, foreground trimming is necessary for precise amplifier gains. The cascadedintegrator-feedforward (CIFF) structure [2-5] implements cascaded integrators to realize NTF, whose coefficients are less sensitive to variation. Closed-loop amplifier-based integration can achieve a nearly perfect NTF, but the high-gain amplifier with multiple
Kai-Cheng Cheng1, Soon-Jyh Chang1, Chung-Chieh Chen2, Shuo-Hong Hung2
National Cheng Kung University, Tainan, Taiwan