Hi:all I am trying to measure the SNR of a second order sigma-delta ADC. I want to just do a FFT analysis for the output of the quantizer. So, I collect 65536 points for FFT. I was told that I should use a Blackman window here.But how many points of the blackman window should I use? Here are some specs: sample frequency:12.5MHz Baseband frequency:20KHz Input signal freq:1000Hz Is there any idea how I can decide the points of that window? Or could anyone tell me the relationship between the input freq,sampling freq, FFT points and windows length? Thanks
how can I decide the points of blackman window?
Started by ●May 29, 2006