Is it possible to have same optimum load through out the frequency range

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circuitking

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Hi, I was reading the paper "OPTIMUM DESIGN OF DISTRIBUTED POWER-FET AMPLIFIERS. APPLICATION TO A 2 - 18 GHz MMIC MODULE EXHIBITING IMPROVED POWER PERFORMANCES " and came across this
"As confirmed by experimental results on commercially available power FETs, the optimum output admittance of the FET is equivalent to a constant conductance Gopt in parallel with a constant capacitance Copt, over very wide bandwidths". Is it really possible for MOSFET and what exactly should I do to find the particular optimum impedance? Because loadpull would give different optimum impedances at different frequencies.
 


Loadpull is one of the ways to find an optimum impedance. But because this problem is rather non-linear, why not throw an optimizer at it and see if it can figure out a matching network that can give good performance over a wide range?
 

circuitking said:
Is it really possible for MOSFET and what exactly should I do to find the particular optimum impedance? Because loadpull would give different optimum impedances at different frequencies.
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Small correction. Is it really possible for MOSFET and what exactly should I do to have the same optimum impedance over very wide bandwidths? Because loadpull would give different optimum impedances at different frequencies.
 

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