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How does Cadence calculate Noise Figure?

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haadi20

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how does cadence get noise figure

Does anybody know, how Cadence calculates the Noise figure of a mixer circuit ? The plotted noise figure i get after Pnoise analysis is absurdly high as 70dB....:cry:

However, when i use the following formula to calculate the noise figure myself (by plotting Nout, Nin and Gain separately), it is around 20 dB.

NF= Nout-Nin-Gain

Any comments or help would be appreciated..!!

Regards
 

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