| US 7,567,123 B2 | ||
| Adaptive bias current circuit and method for amplifiers | ||
| Vincent W. Leung, Plainsboro, N.J. (US); Prasad S. Gudem, San Diego, Calif. (US); and Lawrence E. Larsen, Del Mar, Calif. (US) | ||
| Assigned to The Regents of the University of California, Oakland, Calif. (US) | ||
| Appl. No. 10/587,414 PCT Filed Feb. 14, 2005, PCT No. PCT/US2005/004429 § 371(c)(1), (2), (4) Date Nov. 07, 2006, PCT Pub. No. WO2005/079313, PCT Pub. Date Sep. 01, 2005. |
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| Claims priority of provisional application 60/544719, filed on Feb. 13, 2004. | ||
| Prior Publication US 2007/0252646 A1, Nov. 01, 2007 | ||
| Int. Cl. H03G 3/20 (2006.01) | ||
| U.S. Cl. 330—136 [330/261; 330/296] | 22 Claims |
| 1. A method for producing an adaptive bias current responsive to an input power of an RF amplifier, the method comprising
steps of:
accepting negative and positive input voltages of the RF amplifier;
producing a differential current responsive to the negative and positive input voltages of the RF amplifier, wherein the differential
current clips within the normal operational range of the RF amplifier; and
filtering at least one harmonic from the differential current.
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