Amplifiers – Hum or noise or distortion bucking introduced into signal...
Reexamination Certificate
2007-03-20
2007-03-20
Choe, Henry (Department: 2817)
Amplifiers
Hum or noise or distortion bucking introduced into signal...
C455S114300
Reexamination Certificate
active
11377023
ABSTRACT:
An RF amplifier system employing an analog predistortion module is disclosed. The disclosed analog predistortion module is based on zero crossings of the gain error curves (AM—AM and AM-PM curves minus DC). The hardware structure uses the product of first-order functions avoiding the need for large differential swings in the coefficients to shape the lower part of the gain curves. The higher-order nonlinear functions are preferably derived from a single envelope detector. An equal number of multipliers are preferably used in each path when the order of the magnitude and phase corrections are equal or differ by one, thus reducing delay mismatches between the magnitude and phase correction signals.
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Choe Henry
Myers Dawes Andras & Sherman LLP
Powerwave Technologies Inc.
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