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Future radar transmitters will require a fast reconfiguration of their radio-frequency circuitry in order to adapt to changes in operating frequency and spectral output while maintaining high power-added efficiency. In this paper, transistor load-pull measurement results are displayed in the Power Smith Tube using measurements from a tunable-varactor matching network. Measuring load-pull characteristics...
The ability of radar and communication applications to share the radio spectrum will require the use of innovative agile circuit techniques for radar and communications. Reconfigurable circuits can provide real-time adjustment of operating frequency and spectral output, while maintaining system performance and maximizing power efficiency. This paper discusses recent developments in circuit optimization...
The increased practice of dynamic spectrum allocation requires radar and communication systems that are able to change operating frequency and other performance criteria while maintaining performance metrics such as power efficiency and spectral compliance. This paper presents a simplex algorithm designed to allow frequency-agile circuits to quickly tune for maximum power-added efficiency. Simulation...
A new visualization tool for design is introduced: the Power Smith Tube. It provides aid in designing for optimum power-added efficiency (PAE) while meeting adjacent-channel power ratio (ACPR) requirements. The Power Smith Tube is a three-dimensional cylindrical extension of the Smith Chart with input power as the vertical axis. As such, this Smith Tube allows the visualization of design metrics,...
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