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(Refer to the attached PSpice schematic, entitled balanced audio output
The first simulation run was a transient response test. Plotting the input
voltage (a sine wave in this case) against the pair of output voltages
(the differential pair) shows that the circuit does, indeed, function as
designed. Refer to the attached plot, entitled balanced
audio output - transient.
A frequency sweep from 10Hz to 30KHz was performed, to observe the
frequency response of the circuit. Predictions said that it should be
relatively flat in this range, and indeed this was shown. While some
rolloff starting around 8-10KHz is shown, the rolloff is in thousandths
of volts. PSpice's automatic zoom feature makes this rolloff look a lot
worse than it actually is. The attached plot, entitled balanced
output - freq response, shows the response.
Lastly, a noise analysis (again, with the improper PSpice op-amp model) was
run, to obtain data for later noise analysis.
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