A $720\mu \mathrm{W}$ 77.93dB SNDR $\Delta\Sigma \text{AD}$ Modulator Using Dynamic Analog Components With Simplified Operation Phase

A proof-of-concept ΔΣAD modulator using dynamic analog components with simplified operation mode is designed and fabricated in 90nm CMOS technology. The measurement results of the experimental prototype demonstrate the feasibility of the proposed modulator architecture which can guarantee the reset time for ring-amplifier and relax the speed requirement on the asynchronous SAR quantizer. The peak SNDR of 77.93dB and SNR of 84.16dB are achieved while a sinusoid -4dBFS input is sampled at 14MS/s with signal bandwidth of 109kHz. The total analog power consumption of the prototype modulator is 720μW under the supply voltage of 1.2V.