transistor noise in TRAN simulation

[borodenkov]

I am using SpectreRF & BSIM3v3 model for transistors.

Is the noise of the transistors included while transient simulations in SPICE?? If yes, than which kind (thermal, flicker etc)?

 

[flatulent]

It is most probably not. The noise introduced by the finite arithmetic and the random errors in calculating the time domain values are more than the noise of the transistors.

 

[borodenkov]

yes, I've check it and it seems that you are right...

another question than - how do people estimate the effect of sampling switches noise in sigma-delta modulators (see a new branch)?

 

[flatulent]

yes, I've check it and it seems that you are right...

another question than - how do people estimate the effect of sampling switches noise in sigma-delta modulators (see a new branch)?

They probably set the simulation error parameters with the .OPTIONS statement to much tighter values and set the maximum time step to a much smaller value and then accept the much longer simulation time.