H - Electricity – 03 – F
Patent
H - Electricity
03
F
H03F 3/19 (2006.01) H03F 1/02 (2006.01) H03F 1/32 (2006.01) H03F 3/60 (2006.01) H03G 3/00 (2006.01) H03G 3/20 (2006.01) H04L 27/26 (2006.01)
Patent
CA 2045259
RF power is sampled and measured at the input and output of a solid state pow- er amplifier using directional couplers and matched square law detectors. Outputs from the detectors are applied to differential inputs of a DC operational amplifier. Outputs from the detectors are compared and filtered in the operational amplifier and the result- ing difference signal is applied to a control input on a switching type power supply. The power supply converts a DC input voltage to the various positive and negative vol- tages required to operate the RF devices in the solid state power amplifier. When the control loop is closed, the supply voltage varies to maintain a constant operating point resulting in constant gain, efficiency, and linearity for the overall solid state power am- plifier despite variations in signal levels and signal composition. In another embodi- ment, the solid state power amplifier has a series of single-ended low power amplifiers terminating in an output high power module. In the output module, one medium power device acts as a driver stage for four high power devices connected in parallel. The out- put stages are hybrid coupled, and isolators before and after these hybrid coupled out- put stages isolate the driver from the final amplifiers and protect the output devices from reflected signals. A dynamically controlled PIN diode variable attenuator at the amplifi- er input allows the operating point of the amplifier to be selected and adjusted while the closed loop function is in operation. A hybrid matrix power amplifier system is also disclosed.
Berman Arnold L.
Crampton David L.
Davis Joseph E.
Hughes Electronics Corporation
Sim & Mcburney
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