FEED FORWARD AMPLIFIER SYSTEM USING PENALTIES AND FLOORS FOR OPTIMAL CONTROL

摘要

A feed forward amplifier employing a new adaptive controller and method is disclosed. The controller aligns both a gain adjuster (108) and phase adjuster (109) of a first cancellation loop. The phase adjuster (109) may be controlled following a standard approach. However, the gain adjuster (108) is offset intentionally causing an incomplete cancellation, increasing the signal power passing through the error amplifier (145). If the gain adjuster (108) is offset low, below the gain adjustment required to maximize carrier cancellation, peak power output from the main amplifier (145) is reduced while the second loop maintains constant system output power. By controlling the gain adjuster offset from full first loop cancellation, the feed forward amplifier can be optimized for the power handling capabilities of the main and error amplifiers (115, 145).