Hi everybody,
I am using Pss/Pnoise to simulate NF of a 4-path band pass filter. In term of theory, this NF is medium around 5 to 10 dB depending on the switching frequency, which is
contributed by thermal noise of source resistance, switch resistance and noise folding from other harmonics of switching frequency., flicker noise is supposed to be neglected because there is no DC current from port 1 to port 2
However, the simulation is a little weird to me (it is around 27 dB at 2.41 GHz - center frequency of filter).
Is there any wrong here, could you help to figure out some possible reasons? (any culprit that is able to fold the flicker noise into the desired band, because there is a peak in simulation result)
my circuit infor: it has a divider/4 from 9.64 GHz to 2.41 GHz controls cmos switches
input: 2.41gHz
output 2.41 GHz
insertion loss: around 5 dB
source resistance: 50 ohm at two port
here is my setting for pss/pnoise:
thanks for any advice.
Binh Ngo