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reconstruction a sampled signal, zero order samle & hold or Trapez filter?

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Hi folks,

I have a problem in understanding nyquist theorem. When i sample a signal and receive the sampled signal in RX side,in order to reconstruct the aTX signal, should i use a practical sample and hold filter(which has a sinc shape in freq.domain to obtain a step shape signal) or use a filter that has a trapez shape in freq.domain?


Thanks,

Mitra
 

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