Abstract
A hybrid noise-coupling (HNC) technique is proposed to mitigate the issues with a digital noise-coupling (DNC) structure. In the proposed technique, the unwanted quantization noise that is generated from the noise-coupling analog-to-digital converter (ADC) is injected into the input of the quantizer with one-clock cycle delay, thus increasing the order of noise-shaping of this error. Behavioral simulation shows that the HNC is highly robust against gain variation. The proposed fourth-order continuous-time (CT) delta-sigma modulator (DSM) with HNC scheme was designed in a 28-nm CMOS technology with a core size of 0.3mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . With an oversampling ratio (OSR) of 32, the proposed design achieves a signal-to-noise-distortion ratio (SNDR) of 97.20-dB at a signal bandwidth of 15.625-kHz, which has a 7-dB improvement in comparison to DNC only without introducing significant hardware complexity.
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