|
|
Dan Bobyn |
|
|
|
|
|
|
|
|
|
|
|
|
|
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. |
© 2018 Dan Bobyn Engineering Ltd.