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Help with amplifier selection

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SimonRoller

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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!
 

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?
 

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?
 

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

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.
 

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.
 

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