Amplifier gain insensitive SC integrators with 'sample-sample correction' of both gain and phase errors for singlepath and multipath circuits

摘要

Amplifier gain insensitive integrator building-blocks are described that use a 'same-sample correction' technique. By adding a parallel signal path to a conventional circuit, then using one path to generate an error-correction signal for the other, extremely high accuracy output is obtained. In particular, both gain and phase errors are reduced together, whereas previous, similarly intentioned, circuits traded gain accuracy for accuracy in phase. Both single and pseudo-N-path circuits are described, with the latter showing dramatically improved performance over the previously proposed last cycle correction pseudo-N-path circuit.