#### yolande_yj

##### Full Member level 3

Question: which one has more contribution to the load and why?

My answer was the 1, or source side NMOS. Any noise will copy 5 times to the load.

The interviewer gave me a hint that the thermal noise is 4KTrGm, ask me if I would like to change my mine.

I said Gm is proportional to sqrt(Ids), so the load side NMOS contributes sqrt(5) of noise, still less than x5 from the source side.

after the interview I think a little more, the thermal noise is proportional to sqrt(Ids*W/L), so does it mean the load side NMOS also contribute sqrt(5*5)=5x noise, same as the source NMOS?

what do you think?