I have a series resonant circuit where I will have a lot of capacitors. I want to select a capacitor value for resonance for a particular frequency and want to turn on that capacitor using a MOSFET.

To do that I am using two N-channel power MOSFETs in series. I don't want to control the current flow through the circuit, I just want to switch the circuit on and off. As I understand it, that means I have to switch the MOSFETs in saturation and cut-off mode to achieve that.

I know for cutoff Vgs < Vth (which for my MOSFET is 3 V). This I can do. But in saturation mode it should be Vds > Vgs-Vth. I am not sure how to achieve this. My supply voltage is AC with around +3 V to -3 V, so there will be times when Vds won't be greater than Vgs-Vth and the MOSFET will go into linear mode. How do I overcome this?

[![the basic circuit should be like this](https://i.stack.imgur.com/OPtc1.jpg)](https://i.stack.imgur.com/OPtc1.jpg)