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Given that the INA149 has a -3 db point at about 300 kHz, it's not clear to me why your circuit is -3 db down at 20 Hz. I could be missing something...
Quote from: rstofer on June 28, 2017, 06:39:19 pmGiven that the INA149 has a -3 db point at about 300 kHz, it's not clear to me why your circuit is -3 db down at 20 Hz. I could be missing something...The dashed line in LTspice represents phase, not gain.I think op is trying to measure CMRR with his setup, but the SPICE model of the amplifier might not be detailed enough to render a usable result.
As far as I know the output must be 0dB because it has the same input but what I dont understand is that why the output is like that ( the phase line starts at -10db and the magnitude is at -105db). Is there something wrong with the set up?