moore
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Suppose the transfer funciton of DAC is D(s), (e.g. for NRZ D(s)=(1-exp(-sTs))/sTs) Since D(s) is in the feed back loop, then NTF should be 1/(1+D(s)H(s)), H(s) is the loop filter transfer funciton. However, in most case we find NTF=1/(1+H(s)), and D(s) is missing!
Can anyone tell me why?
I guess it is like this:
For NRZ: exp(-sTs) in Taylor series can be 1-sTs+... Thus D(s) can be simplified as [1-(1-sTs)]/sTs, and finally it turns out to be 1.
Am I correct?
Many thanks!
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