Amplifiers – Hum or noise or distortion bucking introduced into signal...
Reexamination Certificate
2006-09-05
2006-09-05
Pascal, Robert (Department: 2817)
Amplifiers
Hum or noise or distortion bucking introduced into signal...
Reexamination Certificate
active
07102430
ABSTRACT:
A radio-frequency (RF) transmitter power amplifier circuit provides for practically linear performance by predistorting the amplifier input signals to compensate for amplifier distortion at high power levels, and provides a fine degree of control of amplifier power needed to handle complex modulation schemes with widely and rapidly varying power requirements. A predistortion database (20) contains gain and phase corrections for various transmission types and a separate automatic gain control database (38) contains fine amplifier gain corrections. A real-time processor (26) combines the two types of corrections and applies them to the amplifier input signals, and a background processor (16) continually updates both databases in accordance with a programmable priority scheme. Integration of predistortion and amplifier power control is achieved in a manner that minimizes adverse effects of one type of control on the other. One feature of the invention provides for rapid convergence of the predistortion correction.
REFERENCES:
patent: 2005/0057303 (2005-03-01), Leffel
Andrews Michael S.
Bramble Robert A.
Johnson Michael P.
Carmen B. Patti & Assoc. LLC
Nguyen Hieu
Northrop Grumman Corporation
Pascal Robert
LandOfFree
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