Analysis and compensation of OTA non-ideal effects in video-frequency CMOS sinc(x) equalizers

This paper presents a detailed analysis and minimization of OTA non-ideal effects in the performance of sinc(x) equalizers operating at video-frequencies. To compensate these effects, a set of equalizer design equations, expressed in terms of the active device input capacitance, output resistance and the polynomial coefficients used it correct the sinc(x) distortion is derived, facilitating the synthesis process. Simulation based on CMOS OTAs demonstrates the effectiveness of the design equations in compensating accurately the error introduced by the OTAs in the ideal equalizer. This is demonstrated with reference´ to a D/A converter with sampling rate of 27 MHz over 10 MHz bandwidth