Tool/software:
I am using the LMP7704 as a buffer. When I perform an AC Analysis with the op amp supplied with +5V and -5V, the analysis shows a magnitude of 0dB at low frequency, which is what I would expect for a buffer with a gain of 1. If I supply the op amp with a single supply of +5V, the AC analysis shows a magnitude of -44.19dB at low frequency. What would cause the simulation using a single supply to give different results?
Hi Shad,
What would cause the simulation using a single supply to give different results?
With dual ±5Vdc supply rail, your input common mode voltage is near the GND and you are operating in the op amp's linear region at the input.
With +5V single supply rail, you input commode mode voltage range has to be 100mV to 200mV above the minimum Vcm figure specified from the datasheet, see the attached simulation.
If you have other questions, please let me know.
Best,
Raymond
