Help with amplifier selection

[SimonRoller]

Hello, Im new to the forum so if I have posted this in wrong section im sorry! Hopefully an admin can move it.

Im working on a hobby project to wireless transfere power from an grid of coils placed in the ground to a RC-car. We have some problems with the amplification of the signal now that we would like to solve fast, therefore I ask of your expertice.

A 5 V square-wave signal at around 1.5 MHz needs to be amplified to at least 20 V without to much losses. We have tried a couple of different cirquits and OP-amplifiers, but all of them have had problems with the high frequency and high voltage in combination.

Thankful for any suggestions!

ps. sorry for bad language, my english isnt the best!

 

[barry]

How about a MOSFET?

 

[SimonRoller]

Sure a mosfet is most likely to work, its been a long time since I studied this sort of thing. That kind of mosfet configuration is most suitable?

 

[barry]

We can't answer your question without more information. We don't know anything about what your load is. Is it a 500 amp motor? A string of LEDS?

 

[SimonRoller]

Wops, missed that. 200 W (10 A).

 

[barry]

Fine. You are still not giving us a lot of information. So use something like a 60V, 15A MOSFET. For example: FDD5614P.

 

[SimonRoller]

Sorry for that, i dont really know what more info is needed. I basically need some solution to amplify a 5 V signal to 20 V at 1.5 MHz to be connected to a source of 200 W.

Im unsure of what kind of schematic to use for the MOSFET, common source, source follower.... etc.

 

[barry]

So, we can assume that the 5volt square wave is a high-current source? It is capable of driving the mosfet gate capacitance?

You don't want a source-follower.

Probably, and I'm just guessing, you can use a common-source configuration with your load, WHATEVER IT IS, connected between the drain and 20V.