Could some RGF/microwave guru on this newsgroup please help ? I am looking at the datasheet for a ONSemi RF transistor, with the S parameters listed for various frequencies. What would be a quick and easy(that I can code as a simple C program) way to convert these to the corresponding Zin and Yout. Thanks in advance for your hints/suggestions.

Why? Try and find the spice model, and do everything in spice. One of the remain reasons for stuff like S parameters, was simply that it was easier to measure than other ones in the distant past. Its simply all irrelevant now. We have simulation tools. S parameters are way too limiting for optimum design. Usually, they are only specified for one or a few current/voltage sets, and they are only useful at all for linear analysis. This is a disaster for decent optimum production design.s S parameter design for transistor circuits is, essentially, a legacy claptrap rut, that many just can't get out off. A good spice model will allow you do accurately design over the whole range of operating currents and voltages including the required transient, real world large signals that the circuit is actually being used for. -- Kevin Aylward - SuperSpice

Because, as I said, you couldn't afford to run it if it were given to you. and your point is? and your point is? Big fab stuff doesn't cost small potatoes. Sorry.

How to determine Zin, Yout for RF transistor, from A parameters

May 06, 2017 101 Replies

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krw 9 years ago

Parts. the rest may be full custom.

Understanding the requirements document isn't.

Well, yes, trivial logic is, well, trivial.

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krw 9 years ago

Because, as I said, you couldn't afford to run it if it were given to you.

and your point is?

Big fab stuff doesn't cost small potatoes. Sorry.

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