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

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

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A low-power delta–sigma modulator based on inverter operational-transconductance 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 second-order delta–sigma modulator achieves a signal-to-quantisation-noise ratio improvement of 10.4 dB compared to a conventional inverter-based modulator implementing the identical loop filter with the same oversampling ratio.


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      • 5. Gregoire, B.R., Musah, T., Maghari, N., et al: ‘A 30% beyond VDD signal swing 9-ENOB pipelined ADC using a 1.2 V 30 dB loop-gain opamp’. IEEE Asian Solid-State Circuits Conf., Jeju, South Korea, November 2011, pp. 345348.

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