Spurious energy correlation for control of linear power amplifiers
AssigneePowerwave Technologies, Inc.
InventorsRoss James Wilkinson, James Douglas Marvill, Craig Scott Rackstraw, Adrian Richard Mansell
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Abstract
A control system for a linear feed-forward amplifier, using the ratio of measured spurious energy. Measuring receivers are coupled to two monitoring points to measure the spurious energy content in the error signal and at the main output of a feed-forward amplifier. The control system measures the ratio of these detected spurious, and uses this to optimize the settings of the second loop distortion cancellation. With the addition of an extra monitoring point, the same technique may also be used to control an adaptive predistorter prior to the main amplifier.
Claims20
A linear power amplifier comprising:
- a first loop including an input signal;
- a second loop in communication with the first loop including an error signal and an output signal;
- a spurious detection receiver having inputs for receiving the error signal, and the output signal, and first and second outputs;
- and
- a spurious detection correlator having first and second inputs coupled to the first and second outputs of the spurious detection receiver and outputs for controlling the gain and phase of the second loop.
Dependencies are inferred from the claim text.