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Abstract
A hybrid noise-coupling (HNC) technique is proposed to mitigate the issues with digital noise-coupling (DNC) structure. In the proposed technique, the unwanted quantization noise that is generated from the noise-coupling ADC is injected into the input of the quantizer with a one-clock cycle delay, increasing the order of noise-shaping of this error. The proposed fourth-order CT-DSM with HNC scheme was fabricated in 28-nm CMOS technology with a core size of 0.3mm2. With an OSR of 32, the proposed design achieves an SNDR of 97.20-dB at a signal bandwidth of 15.625-kHz, which has a 7-dB improvement in comparison to DNC only.