Incoming signal:

- 10 MHz squarewave

- 25mA (at most)

Needs:

- voltage swing roughly -3 to +3 volts (two power supplies)

- up to 500mA constantly

The graduate student I'm working with suggested using a MOSFET and 2 power supplies: +3V and -3V. He already has a non-inverting opamp circuit doing what he needs, but he has me looking for an alternative. My idea was to use 2 cascaded common-source amps then a final common-drain stage.

Any suggestions on MOSFET's to use? There are so many out there and I need to find one so I can model it in LTSpice.