Just trying to compare the LT1010 buffer vs a discrete buffer, (page
14 in the LT1010 data sheet.)I cant get the sig gen distortion, SINE(0 1 1000), better than about
-40dB on the 3rd harmonic.
Any tweaks?
martin
"martin griffith" a écrit dans le message de news: snipped-for-privacy@4ax.com...
What spice really do is an FFT, so make sure to have the right signal length to avoid spectrum leakages (i.e. a full number of periods minus one FFT sampling time).
-- Thanks, Fred.
Yes. Initially came across the problem with a low distortion oscillator circuit. No matter how I tried I couldn't get the circuit distortion down to less than .1%. Trick is to force '.tran' to use a timestep way below what it would naturally pick for itself. Results is a slower tran run but gives circuit waveforms consisting of vast numbers of data points. At 1kHz a fixed 10uS max timestep (say) gets you down to the -90dB area. eg. " .tran 0 100m 0 10u " john
Thanks for that
martin
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