Amplifiers – Hum or noise or distortion bucking introduced into signal...
Reexamination Certificate
2006-04-25
2006-04-25
Shingleton, Michael B. (Department: 2817)
Amplifiers
Hum or noise or distortion bucking introduced into signal...
C327S549000, C327S551000, C327S552000, C327S560000
Reexamination Certificate
active
07034612
ABSTRACT:
An apparatus and method that compensates for pre-distortion of a power amplifier includes a digital pre-distorter controller which generates a power/phase compensation coefficient, a temperature compensation coefficient and a frequency compensation coefficient, a look-up table which stores the coefficients, a pre-distorter kernel which pre-compensates an input signal based on the temperature compensation coefficient from the look-up table, and a correction filter which compensates an output signal of the kernel based on the frequency compensation coefficient from the look-up table. If desired, an input signal may be pre-distorted based on only one of the temperature and frequency compensation coefficients along with the power/phase compensation coefficient. Nonlinear characteristics of the power amplifier are accurately checked and distortion due to the nonlinear characteristics are compensated for.
REFERENCES:
patent: 2002/0044014 (2002-04-01), Wright et al.
patent: 2001-094617 (2001-04-01), None
patent: 2001-141754 (2002-05-01), None
CN Office Action dated May 13, 2005.
Fleshner & Kim LLP
LG Electronics Inc.
Shingleton Michael B.
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