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Noise of Sampled Signals: kT/C-Noise<br />

White noise with power spectral density is<br />

low-pass filtered:<br />

Noise power:<br />

independent on R<br />

Remarks:<br />

• Sampling makes this a little bit more complicated as noise is a wide band signal so there is aliasing of replica<br />

spectra. However, the noise power in the baseband is still kT/C<br />

• This is only a lower bound of noise power, buffers contribute also to overall noise power<br />

Stephan Henzler Mixed-Signal-Electronics 2012/13<br />

59

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