Amplifiers – Hum or noise or distortion bucking introduced into signal...
Reexamination Certificate
2008-12-11
2010-06-08
Choe, Henry K (Department: 2817)
Amplifiers
Hum or noise or distortion bucking introduced into signal...
C375S297000
Reexamination Certificate
active
07733177
ABSTRACT:
An apparatus is provided to determine pre-distortion for a nonlinear system. The apparatus comprises a datapath and a power amplifier. The datapath employs predistortion data to generally linearized the power amplifier. To generate this predistortion data, an indirect learning circuit and a direct learning circuit can be employed. The indirect learning circuit is generally coupled to the amplifier circuit so that it can iteratively adjust predistortion data during an indirect learning mode until convergence is reached. The direct learning circuit is generally coupled to the amplifier circuit and the indirect learning circuit and that receives the input signal so that the predistortion data can be copied to the direct learning circuit from the indirect learning after convergence is reached and so that the direct learning circuit can adjust the predistortion data during a direct learning mode.
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Borkar Milind Anil
Copeland Gregory
Mujica Fernando Alberto
Brady III Wade J.
Choe Henry K
Patti John J.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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