Hi all,
I built the attached circuit, but can only get the outputs to swing from 4.9 V to -2.47 V (approximately) and need them to go from -5 to 5. This will give me the 0-10V i need. What do you think could be the issue. Also, by using the complement of the pwm output, the motor doesn't jump at startup. Also at the point where the differential signal is 0 V, the two outputs show 1.14V with respect to ground. Shouldn't this be zero with the circuit I have? Finally the -12 V bus generated with the switched capacitor is only giving 10.08 V when on, can anyone suggest a different setup to get a little more margin for the differential op amp?