Amplifiers – Hum or noise or distortion bucking introduced into signal...
Reexamination Certificate
2011-03-29
2011-03-29
Shingleton, Michael B (Department: 2815)
Amplifiers
Hum or noise or distortion bucking introduced into signal...
C330S151000, C375S316000
Reexamination Certificate
active
07915954
ABSTRACT:
Methods and apparatus for amplifier AM and PM predistortion and autocalibration. AM and PM amplifier distortion can be corrected using predistortion. The AM and PM distortion characteristics of the amplifier are determined using an autocalibration technique. The amplifier characteristics can be stored in distinct look up tables. Alternatively, the inverse of the amplifier characteristics can be stored in distinct look up tables. Signals that are to be amplified are characterized in polar format having a phase component with a normalized magnitude and a magnitude component. The phase component can be predistorted by applying the inverse of the PM distortion characteristics to the signal. Similarly, the magnitude component can be predistorted by applying the inverse of the AM distortion characteristics to the signal. The predistorted phase component can be amplified using the previously characterized amplifier. The predistorted magnitude component can be used to set the gain of the previously characterized amplifier.
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Peterzell Paul E.
Raghupathy Arun
Reeves Robert
Sahota Gurkanwal (Kamal)
See Puay Hoe
Cheatham Kevin
Hooks William M.
Qualcomm Incorporated
Shingleton Michael B
LandOfFree
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