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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.
 

circuitking said:
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.
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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.
Click to expand...

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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