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Re: test for transients

Don't forget to allow sufficient DC settling before the period(s) you use to calculate the FFT. Small DC shifts over the period can cause leakage effects that look like 1/f noise around the harmonics.

Earlier you alluded to a 150dB dynamic range in your sim. results. This is seems too good to be true - what settings are you using?

For my part, I tried the 2 small tones, one large tone test on a basic BJT diff. pair. The intermod products around the two small tones do not change in level but intermod tones appear around the large tone due to the small tones which can easily become larger than the small tones themselves. Nothing revelatory I s'pose, but a powerful arguement for low order non-linearities to limit the amount of intermod products.

Regards
13DoW

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