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Transient noise vs. Pnoise+

Cliff Kim

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Hello,
Noise performance of our designed circuit is checked using trasient noise simulation since the test result is almost close to the simulation result though the noise result would be changed slightly according to the noise BW.
However, the simulation time for transient noise is relatively longer than Pnoise and moreover it could be severe when the circuit is bigger and complex.

So, we want to use Pnoise result to estimate the noise performance of our circuits.
We already have checked that the PSD plot of transient noise result and Pnoise plot are the same. But we have to take into account that our circuit takes sampling with specific frequency at the output signal of the circuit.
Though we are aware that the difference between integrated noise calculation from the Pnoise and noise estimation of our system, how can we derive the noise result from the Pnoise simulation which agrees well with the sampled transient noise simulation?

Sincerely,
Cliff
 

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