Rf input drive saturation control loop

Details Rf input drive saturation control loop Rf input drive saturation control loop

H - Electricity

03

F

330/108

H03F 3/58 (2006.01) H03G 3/20 (2006.01)

Patent

CA 1240005

ABSTRACT OF THE DISCLOSURE A system for optimizing the RF input drive to a TWT amplifier over a frequency band of interest is disclosed. The system includes a microprocessor-based controller, an RF detector for detecting the TWT output, and a variable attenuator for adjusting the input drive to the TWT. The controller comprises an analog-to-digital converter for converting the video detector signals and providing digital RF level signals which are representative of the TWT output power level. Frequency data is also provided to the controller indicating the frequency of the RF exciter signals driving the TWT. The controller is, therefore, provided with frequency and RF level information, and is adapted to control the attenuator to adjust the TWT input drive for optimum TWT output. The system is operable in a calibration mode wherein the controller follows a calibration algorithm to determine the optimum attenuator setting, resulting in the maximum RF output, for each frequency of interest. The optimum attenuator setting is stored in an EEPROM for each drive frequency. The system is further operable in a normal mode wherein the controller sets the attenuator at the predetermined optimum setting for the present exciter frequency.

510415

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