Analysis of timing jitter in bandpass sigma-delta modulators

The effect of clock jitter on the dynamic range of discrete-time (DT) and c ontinuous-time (CT) sigma-delta modulators is addressed. It is shown that c lock jitter in DT modulators mixes with the input signal, while for CT modu lators, the jitter mixes with the out-of-band quantization error and elevat es the passband noise. The signal-to-noise ratio of CT modulators is shown to be more susceptible to clock jitter than their DT counterparts. Analytic al and simulation results are provided.