Feasibility analysis of the fixed-width pulse RZ feedback to reduce clock jitter effects in lowpass continuous-time ΔΣ modulators

A recently proposed method to reduce clock jitter effects in continuous-time Delta-Sigma modulators is to generate a return-to-zero feedback with a fixed-width pulse for active feedback. In practice, the pulse width is subject to noise effects causing jitter of the pulse width itself. Therefore, jitter of the pulse width, though not the clock, may still degrade the performance of Delta-Sigma modulators. In this brief, we investigate practical feasibility of the method. It is shown that jitter of the pulse width could be conditionally much smaller than that of the clock, which therefore reduces clock jitter effects.