Hello everyone,
I currently have a problem with a THS4031 and a transformer.
In short: I have an operational amplifier circuit and want to couple the signal (100kHz 10Vpp sine wave) somewhere else.
The problem is independent of the transformer.
I get it in reality as well as in the simulation when I connect a coil behind a THS4031.
I have illustrated it in the simulation.
1) This is the circuit as I have it approximately.
This “wobble” also occurs in reality.
2) Here, I tried to buffer the signal after the op-amp in the simulation.
3) If I only use the THS4031 for buffering, it works.
Can anyone explain why buffering doesn't work this way?
Or does anyone know of an alternative op-amp or circuit that I can use to couple the signal after the inverting op-amp circuit (1) into the transformer coil?
The inductance of the coil should not be a problem for the op-amp, as the maximum current is not exceeded.
I have also tried significantly larger and smaller values. In the simulation, it only shifts the point of the “wobble.” Unfortunately, it does not disappear.
Best regards and thanks in advance,
David
