I am trying to convert a single ended waveform from an stm32 mcu to a differential one. The first issue was with the the non inverted signal. When I disable the buffer, it limits the output to 1V (when it should be 3.3V). When I enable the buffer, the issue goes away and I get the full swing. Perhaps the DAC has high output impedance and forms a divider with my pull down? The next issue is when I get the full swing from the noninverting op amp, the inverting op amp now outputs no more than -1V. I am more confused about the 2nd issue. Any ideas?
My rails are 5 to -5.
The op amp is a dual op amp opa2172.
The signal is something close to a sine wave.
Schematic is attached.
MOD:Cleaned up your image.E
My rails are 5 to -5.
The op amp is a dual op amp opa2172.
The signal is something close to a sine wave.
Schematic is attached.
MOD:Cleaned up your image.E
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