[time-nuts] 1/f^2 noise
jimlux at earthlink.net
Mon Nov 24 10:06:43 EST 2014
Started plotting some sampled data from my experimental system, and
interestingly, it seems to have a 1/f^2 slope, rather than a 1/f slope.
I had expected the amplifier noise to dominate, but perhaps one of the
myriad other noise sources is contributing as well (e.g. sample clock
jitter, ADC quantization). ADC quantization should be white, though.
only 6000 samples at 200 Hz here (30 seconds) so the data below 1 Hz is
getting pretty sketchy..
The input to the system wasn't necessarily AWGN or DC (it might be an
oscillator beating against itself in a mixer with a very short
difference in time (nanoseconds). I'll run another test with the input
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