Harmonic distortion in fully-differential switched-current sigma-delta modulators

This paper presents a systematic analysis of the harmonic distortion in /spl Sigma//spl Delta/ modulators (/spl Sigma//spl Delta/Ms) implemented with fully-differential switched-current (SI) circuits. Closed form expressions are derived for the third-order harmonic distortion in lowpass and bandpass /spl Sigma//spl Delta/Ms. For the latter, the third-order intermodulation distortion is also deduced. Time domain behavioral simulations validate our approach.