A Continuous-Time Sturdy-MASH Modulator in 28 nm CMOS

PROJECT TITLE :

A Continuous-Time Sturdy-MASH Modulator in 28 nm CMOS

ABSTRACT:

This paper presents a practical method to realize each wide signal bandwidth and high dynamic range in a continuous- time (CT) delta-sigma modulator. Quantization noise is suppressed aggressively by increasing the effective order of the noise transfer perform primarily based on a durable multi-stage noise-shaping (SMASH) design. The proposed CT SMASH design has a abundant wider signal bandwidth that was restricted in the discrete-time (DT) SMASH architecture due to the inherent sampling frequency limitation of DT implementation. Furthermore, the proposed CT SMASH architecture provides better quantization noise suppression by a lot of completely canceling the quantization noise from the $onehbox st$-loop. The CT SMASH design is implemented with several efficient circuit techniques suitable for prime operation speed. Hence, the prototype fabricated in twenty eight nm CMOS achieves DR of eighty five dB, peak SNDR of seventy four.nine dB, SFDR of 89.three dBc, and Schreier FOM of 172.nine dB over a fifty MHz bandwidth at a 1.eight GHz sampling frequency.

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