A 102dB dynamic range audio sigma-delta modulator in 40nm CMOS

A second-order audio sigma-delta modulator has been implemented in 40nm CMOS with 0.05mm2. Hybrid mode operation with comparator reduction technology is designed under optimized system synthesis model. DAC element selection with positive and negative state scrambling is provided in the design. A start-up sequence including RC calibration and signal monitoring is developed to prevent unstable operation. The measured results show 90dB SNDR, 98dB THD, and 102dB dynamic range with-in 24kHz bandwidth, while consuming 500μW of total power at 6.5MHz sampling.

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