Use PSpice models to estimate amplifier noise (Hooman Hashemi, National Semiconductor Corp / Planet Analog)

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Amplifier noise analysis can be complex, but you can use PSpice to get useful estimates and explore what-if scenarios

While it may be relatively easy to estimate amplifier output noise in cases involving simple amplification or where noise is dominated by flat-band noise, it is fairly complex to do so when the individual noise sources (i.e. thermal, device 1/f, and so on) operate over varied bandwidths and / or where noise is not dominated by the amplifier’s flat-band region.

PSpice is a good tool for computing output noise in these cases and it also simplifies “what if” investigations. This article outlines proper PSpice techniques to simplify the task and shows an example which would be inherently more difficult using other estimation techniques.

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