Power-amplifier optimization using tunable circuitry and stability analysis methods for the next generation radar.
Access rightsNo access - Contact email@example.com
Hays, Lucilia R., 1993-
MetadataShow full item record
In response to the increasingly congested and contested wireless spectrum, the next generation radar must be adaptive and reconfigurable. A reconfigurable power amplifier is a necessary component of the cognitive radar system. The reconfigurable power-amplifier must operate efficiently and stably while maintaining spectrum compliance. The research in this thesis presents state-of-the-art tuning algorithms for optimizing the load reflection coefficient presented to a transistor by novel tunable circuitry. The algorithms are implemented on systems using a varactor diode network and a high-power handling evanescent mode cavity tuner as the tunable load matching networks. In addition, stability considerations are explored. A new amplifier design tool, the frequency Smith Tube, is presented which allows for broadband stability analysis for small-signal inputs. A real-time stability analysis procedure based on the acceleration of transducer gain during optimization is also presented.