Wideband cascade delta-sigma modulator with digital correction for finite amplifier gain effects
Date of Original Version
The authors present an alternative approach to reducing the effects of finite amplifier open-loop gain in cascade delta-sigma modulators. The proposed gain compensation is carried out in the digital domain and thus requires no additional analogue circuitry. The method is illustrated by the example of a double third-order cascade circuit which, when properly compensated for finite gain effects, can yield 16-20 bit resolution with oversampling ratios as low as 16-24.
Fischer, G., and A. J. Davis. "Wideband cascade delta-sigma modulator with digital correction for finite amplifier gain effects." Electronics Letters 34, 6 (1998): 511-512. doi:10.1049/el:19980405.