Dynamic depressed collector
AssigneeCommunications & Power Industries, Inc.
InventorsMichael J. Cascone, John Arthur Lazar, John Brinson Overstreet
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Abstract
A biasing system for use with a multi-stage depressed collector of a high power amplifier includes one or more adjustable power sources. A power controller provides control signals to the power sources depending on the operational RF power level. For low power applications, biasing of collector electrodes is reduced such that savings in energy costs are realized, and operational temperature and wear are reduced. The control signals are based on values stored in a look-up table. For multiple depressed electrodes, biasing can be controlled in tandem or independently.
Claims13
A biasing system for an electron tube having at least two collector stages, the biasing system comprising:
- at least one adjustable power source for biasing an electrode of one of the collector stages;
- and
- a power controller having an output for driving the adjustable power source, the output being a function of measured RF power in the electron tube.
A power amplifier including an electron tube, comprising:
- an anode;
- a cathode;
- a collector having at least one depressed collector;
- an adjustable power source connected to the depressed collector;
- and
- a power controller configured to drive the adjustable power source to achieve a biasing voltage at the depressed collector in accordance with measured RF power in the power amplifier.
Dependencies are inferred from the claim text.