Inverter-based low-power delta-sigma modulator using correlated level shifting technique

Abstract

A low-power delta-sigma modulator based on inverter operationaltransconductance amplifiers (OTAs) using correlated level shifting technique (CLS) is presented. The CLS technique boosts the DC gain of inverter-based OTA from 42 to 79 dB and extends the linear output swing from 55 to 80% of the full scale. Simulation results show that design in 180 nm CMOS technology, the proposed secondorder delta-sigma modulator achieves a signal-To-quantisation-noise ratio improvement of 10.4 dB compared to a conventional inverterbased modulator implementing the identical loop filter with the same oversampling ratio.