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Design Notes

Broadband VHF/UHF Amplifier Design Using Coaxial Transformers

This project shows the results from a broad band power amplifier designed by Polyfet RF Devices using Applied Wave Research software. 

This work was published in the May 2003 edition of High Frequency Electronics (     

A PDF file of the publication is included in the same folder as this example, titled HFE0503_Leong.pdf.  sch2d:Zamp

A simple calculation of Pdiss (Power Dissipated in the amplifier = Pdc + Input Power - Output Power) is demonstrated.  The equations make use of standard measurements Gain, DCRF, and the measured output power to obtain the desired Pdiss.

The results of Pdiss are plotted on the graph "Swept Power IDS and Pdiss at 250 MHz". gph:Swept Power IDS and Pdiss at 250 MHz  All of the equations can be viewed on the Output Equations page in the Project tab.

This project contains the finished design of this circuit using the Polyfet power MOSFET devices.

Notice the simulation results of this project compared to the measured results. 



Courtesy of Dr. S.K. Leong from Polyfet RF Devices