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Dan Bobyn
Engineering Ltd.

 

 

 

 

 

 

 

 

 

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VHF Multicarrier PA and Power Control Loop 

It was necessary to refine an existing 100W VHF PA design to be capable of operating at selectable maximum operating output power levels (16, 50, 100 W), and to incorporate automatic output power control over a wide range of input power levels and modulation conditions. 

An active bias feedback circuit overcame variations in the device operating point over temperature, and production population.

A power levelling feedback circuit controlled the output RF power level to ensure the PA was operating at an optimum RF level for the selected PA output power level

The program required expertise in high power RF circuit design, feedback loop modeling and linear and nonlinear circuit simulations.

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