IXDD614 Gate Driver at 21 MHz

[ka1tdq]

Has anyone ever tried using an IXDD614 gate driver at 21 MHz?  I know gate capacitance of the driven MOSFET becomes an issue at that high of a frequency, but I'm planning on using a single IRF510.  Its gate capacitance is only 180pf. 

I have a 4 volt pp sine wave at 50 ohms that I plan on driving the IXDD with.  It's a 160 mW 15 meter CW transmitter, but nobody answers when I call CQ (understandably).  I'd like to make a single FET amplifier stage after it. 

Jon
KA1TDQ

[WBear2GCR]

I'm not sure, but don't you want a linear amplifier, not a "switched"/square wave amplifier?

                         _-_-

[ka1tdq]

My hunch is that the square waves will be sufficiently rounded over at that speed.  As long as it turns the FET on/off somewhat, I'll get RF out.  Efficiency could be anywhere, and I don't need linear service since it's CW. 

I did this with my 40 meter CW rig, and it works.  I just don't know how it'll work on 15 meters.

Jon

[DMOD]

See the equations in Section III and work backwards through them to determine the limits.

Disregard the Tables for now.

Phil - AC0OB