PIN Diode Switch in a Frequency Multiplier Circuit

Is the spectral noise a result of a step in phase of the output signal cause by the switching?

Do the signals need to be phase synchronised at the point of switching?

Is the switching smooth, ie no dither?

Just some thoughts

Bill

Yes I did consider the phase and thought the capacitors in the arm might be the cause of it. Do you think the composition of the capacitor affects it? We use multilayer ceramic capacitors, but we are going to try and replace them with porcelain ones. But the problem is encountered only in one of the arms out of the four arms in the switch. We tried lowering the switching speed in the problematic arm, it reduced the spikes but did not eliminate it. Thanks.

If the problem is occurring in only one arm, there is something different in that arm - a faulty component, a bridge, an impedance mismatch, a wiring error .... perehaps in the switch, or associated components or even the load.... check carefully.

Are you able to try swapping connections, loads, boards etc to see what items the fault follows?

If that is possible, it should narrow down your search considerably.

Regards

Bill

Thank you so much for the help. It looked it was an impedance mismatch and I was able to fix it and the rest was just assembly problem with the epoxy creeping up around the diode in the diode holes that was causing it.

I am pleased to be of service.

All the very best

Bill