Ran a linearity test from 400kHz to 50mHz. Power level was
set at -70dbm. I’ll do another run at a
higher power level later, but previous testing showed an even better response
curve.
Surprisingly, the circuit over this range of frequencies
without the frontend compensation components had better results. 32mv compared
to 40mv. Over the hf range the variance was
12mv for no compensation and 20mv for the circuit with the compensation components
added in. Maybe the circuit has better results on frequencies between 100 to
500 mHz. Since a change of 1dBm results
in a change of 25mv, this represents about .5dBm difference when not using the
compensation components within the hf frequencies.
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