Hi!
So I am currently working on a HV driver circuit for a tunable filter. I have a 10W +/-600Vdc supply that I want to use but I am not sure if I can use a virtual ground since my filter needs to be on the same ground as the rest of the circuit. Is it even a good idea to consider a virtual ground in RF? If this is possible I would really appreciate any resources!

 

If virtual ground is created with active control loop then
its compromised by the control loops RF performance.

So what is the freq range you are trying to manage ?

Regards, Dana.

 

Dana,
Thanks for the reply!
So we have a bank of 5 filters with the following band divisions:
1. 30 - 53MHz
2. 53 - 93MHz
3. 93 - 165 MHz
4. 165 - 290MHz
5. 290 - 512MHz

I am very new to RF design so I appreciate any explination you're willing to give will be very grately appreciated!

 

If you do a control loop to set a bias point for the virtual ground you
would also need to C load its buss to get an ac ground.

Not an expert here but I would pay a lot of attention to C technologies and pack-
aging (read low L solutions) for RF caps, eg. ESR curves, and selection of amp
or regulator that is going to set the bias point, its permissible C loading allowed.

Good news is the range of caps you will need for RF work should be small enough
to not affect regulators, but read the datasheets. However, RF affects on regulators
a bit of a new adventure, I do not see their datasheets characterized for any RF power
or signal effects.

https://www.johansontechnology.com/rf-capacitors

https://www.vishay.com/doc?61093

http://www.microwavejournal.com/?gclid=EAIaIQobChMI67jM9fOw2wIVTL7ACh1VTQsIEAMYAiAAEgLQ8PD_BwE

Regards, Dana.