flamingo
Member level 4
For a given ckt, e.g., an amplifier, to get the nonlinearity performance I used fft analysis in Hspice, but the results is confusing. For a relatively large signal input the linearity performance is excellent due to fft spectrum, as good as about HD3=65dB. while the input signal is reduced to a lower amplitude, HD3 and NoiseFloor of fft is deteriorated, bad as HD3=40dB. why why??
In my opinion, the lower input signal for a amplifier the higher HD3 performance, but why I got the contrary. Someone else encountered this kind of problem?
In my opinion, the lower input signal for a amplifier the higher HD3 performance, but why I got the contrary. Someone else encountered this kind of problem?