# What's the Model for a DAC followed by a sampler

I have a situation where a sampled signal is passed through a DAC and re-sampled by a switched capacitor circuit.

I can't see a model for this in the literature.

The standard model of a DAC is the ZOH. But when it gets re-sampled by the switched cap circuit it seems to me that ZOH effect of the DAC disappears because of the re-sampling.

What does the Signal Processing SE community think?

Assume the re-sampling is at the same rate as the DAC.

It depends on how acccurate your model is. For an ideal DAC with rectangular impulse response $g(t)$ followed by an ideal sampler your observation is true: the sampled signal is identical to the DAC input signal.
But as soon as some frequency selective element comes into play (e.g. anti-aliasing filter) the impulse repsonse $g(t)$ causes a droop in frequency domain.