| US 7,477,102 B1 | ||
| High efficiency linear microwave power amplifier | ||
| Grant Andrew Ellis, Gelugor (Malaysia); Miroslav Micovic, Thousand Oaks, Calif. (US); Keh-Chung Wang, Thousand Oaks, Calif. (US); and JeongSun Moon, Moorpark, Calif. (US) | ||
| Assigned to HRL Laboratories, LLC, Malibu, Calif. (US) | ||
| Filed on Jul. 11, 2006, as Appl. No. 11/485,037. | ||
| Claims priority of provisional application 60/783293, filed on Mar. 17, 2006. | ||
| Int. Cl. H03G 5/16 (2006.01) | ||
| U.S. Cl. 330—133 [330/129; 330/285] | 3 Claims |
| 1. A dynamic biasing method for a two-stage amplifier device, the method comprising:
tracking input power level and output power level of the two-stage amplifier device;
evaluating harmonics of the output power to produce a control signal;
modulating a DC bias signal based on the control signal; and
providing a modulated DC bias as drain to source voltage to each stage of the two-stage amplifier device as feedback to correct
nonlinearity in output power of the two-stage amplifier,
wherein the two-stage amplifier device includes a low distortion first stage amplifier and a high efficiency second stage
amplifier.
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