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On 25/05/2024 06:22, john23 wrote:

Hello, I have in my lab an evaluation board for CGHV1A250F.
It will be incorporated to the CGHV1A250F chip into a bigger design.

Currently because its a Vds=45 and Ids=15 when rf is runnning then i see it as 3Ohm resistor.
but the problem is that i need to pick a suitable gate driver so the capacitance on the gate will charge .

how can i do? basic " spice model" so i could put into a simulation?

Thanks.

I presume you're planning to use the CGHV1A250F for its intended purpose as a high power RF amplifier for the 8.8-9.6GHz range. To think of it as switching transistor, whose gate has to be driven from a "gate driver" is entirely wrong. Viewing it as a "3Ohm resistor" is completely misguided. If this isn't your application, then you need to consider carefully what you need to do, as this almost certainly isn't the right device.

As far as I can see, the CGHV1A250F is internally matched for use in a 50Ω system. If you want to use it in an LTspice simulation, you need to download its from the new supplier (MACOM), convert those to a generic SPICE model with the S2SPICE program. You can use the S2PORT port symbol that can be found in the group's file archive, link that to the converted SPICE model, and construct a simple .AC analysis with a 50Ω source and 50Ω load. You won't be able to do a sensible non-linear analysis (.TRAN) because there is no data available for this device. There isn't even a datasheet available from the current supplier, unless you specially request it, presumably signing an NDA (non disclosure agreement) as well, although the old Wolfspeed one is downloadable from the URL you included. I'm surprised you managed to get an Eval Board. Digikey stock the devices at the one-off price of $789!

Frankly, LTspice isn't the right tool to be using for design in this frequency range.

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Regards,
Tony