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The paper presents a continuous-time (CT) Delta-Sigma (ΔΣ) analog-to-digital converter (ADC) using a current output digital-to-analog converter (DAC) for the feedback. From circuit analysis it is shown that using a current output DAC makes it possible to relax the noise requirements of the 1st integrator of the loopfilter, and thereby reduce the current consumption. Furthermore, the noise of the current...
This paper presents a new optimization method for achieving a minimum current consumption in a continuous-time Delta-Sigma analog-to-digital converter (ADC). The method is applied to a continuous-time modulator realised with active-RC integrators and with a folded-cascode operational transconductance amplifier (OTA). Based on a detailed circuit analysis of the integrator and the OTA, key expression...
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