Design of Stable, High Efficiency, High Power Upper Sideband Upconverters

摘要

This report presents a logical design procedure to build stable, efficient varactor upper sideband upconverters. It establishes general design criteria to provide unconditional stability, low spurious, predictable diode impedance levels, and predictable efficiency. A sample design is included to illustrate one means of realizing the design constraints and showing the agreement between predicted and achieved stability, impedance match, efficiency, and power output. The second part of the report discusses means of obtaining high power operation by using multiple varactors. It is concluded that the best configuration is a series stack of varactor diodes. With allowance made for the package parasitic reactances, it is proven analytically that stacked, packaged diodes operate efficiently as an upper sideband upconverter. Finally, an example of a stacked varactor upconverter design was built and measured. The agreement between predicted and obtained results is remarkably good. (Author)