Power amplifier control reducing output power variation

Details Power amplifier control reducing output power variation Power amplifier control reducing output power variation

2006-09-19

2006-09-19

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

C341S065000, C330S285000, C330S296000, C455S127500

Reexamination Certificate

active

07109897

ABSTRACT:
Power control circuitry for providing a variable supply voltage to power amplifier circuitry in such a manner as to reduce or essentially eliminate variations in output power due to variations in load impedance is provided. The power control circuitry includes a voltage regulator for providing the variable supply voltage to the power amplifier circuitry, current detection circuitry, correction circuitry, and combiner circuitry. In operation, the current detection circuitry provides a signal indicative of an actual current provided to the power amplifier circuitry from the voltage regulator. The correction circuitry provides a correction signal based on a comparison of the signal indicative of the actual current and a signal indicative of a reference current. The combiner circuitry operates to combine the correction signal and the adjustable power control signal to provide the corrected adjustable power control signal to the voltage regulator.

REFERENCES:
patent: 6665525 (2003-12-01), Dent et al.
patent: 6701138 (2004-03-01), Epperson et al.
patent: 6917245 (2005-07-01), Dupuis et al.
patent: 7058374 (2006-06-01), Levesque et al.

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