A self calibration technique for tunable continuous-time bandpass delta-sigma modulators

This work presents a simple approach to the correction of absolute gain errors in a tunable continuous-time bandpass Delta-Sigma modulator based on a Leslie-Singh architecture. The calibration is performed in the digital domain using the employed hardware. Thus, no additional analog circuitry overhead is added to the system. By tuning the center frequency of the analog resonator for correction, matching between the analog and digital part of the modulator is achieved. Behavioral simulations performed on a cascaded 2-0 Leslie-Singh modulator result in an almost ideal performance after correction.