Hi, I need to generate a 3 state signal i.e. 12V, -12V and 0V square wave using 2 IOs from FPGA. I have a circuit shown below, 2 signals are generated i.e. 0V to +12V and -12V to 0V, but I need to combine these 2 signals into one waveform so that 0V , 12 V, 12 V states are not disturbed. when I combined these 2 outputs with a single wire, the output amplitude was -5 to +5V, but the expected amplitude is -12V to +12V. I provided an input signal from 0 to 3V3 from the function generator and the input of the 2nd op amp was exactly 180 degrees out of phase (to generate this I used an inverter that uses a transistor). suggest any solution to combine outputs.
IO1: 1, IO2: 0 -> output + 12VIO1 …
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