I have an OPA548 IC which is a high-power op-amp. I am using it in non-inverting amplifier configuration as shown in the schematic.
The input signal is a ramp signal with low voltage 0.1 V and high voltage 1 V @ 1 kHz. I have added a RC low pass filter at the output because I am trying the circuit in a breadboard and wires leading to high frequency noise. I have used a load as 50-ohm resistor for simulation and to test the output before connecting to the actual equipment. The circuit works fine.
But when I connect the actual equipment for which this circuit is designed, I get an output like something shown below: Channel 2(blue) is the voltage at opamp output. Channel 4(green) is the voltage after LPF when connected to equipment.
At higher frequency, the output is not as expected. The load is an equipment which has some kind of piezo driver. So, I think the load is not purely resistive, but how should I modify the circuit to work as expected for the reactive load? or the filter can be modified any way to work for any load?
Please don't recommend using a buffer stage, any other suggestions would be helpful?