I'm exploring the
.MEAS command with the following simple BJT Class-AB amplifier:
And am getting the following results from my
.MEAS commands in the error log:
vout_max: MAX(mag(v(vout)))=(27.4778dB,0°) FROM 10 TO 1e+010 vout_3db: vout_max/sqrt(2)=(24.4675dB,0°) f_3db: freq=(142.323dB,0°) at 1.30662e+007
The results for
vout_3db seem correct, they agree with the plot to at least 2 decimal places.
I'm very puzzled by the results for
f_3db however. It appears to call
V(vout) crossing the -3dB point at 13.06MHz, where the plot (screenshot below) has it at 19.41MHz.
- Why are these numbers so different?
- Have I written these
I expected these to agree to at least several decimal places given they're both calculated from the same simulation run.