Amplifiers – With amplifier bypass means
Patent
1998-01-26
1999-09-28
Pascal, Robert
Amplifiers
With amplifier bypass means
375297, H03F 100, H04K 102
Patent
active
059595000
ABSTRACT:
A linear RF transmitter uses an adaptive forward model of the power amplifier in a feedforward linearization system. The forward model outputs a modeled power amplifier output signal, which is then used to calculate the error signal. The error signal represents the distortion caused by the power amplifier, which is then subtracted from the power amplifier output signal. The forward model can optionally model memory effects of the power amplifier transfer characteristic to more accurately generate the error signal. In addition, the forward model may be generated from the power amplifier output signals using orthogonal predictor variables to further improve performance. These orthogonal predictor values are then used to calculate parameter values used by a feedforward filter to model the power amplifier. A coordinate mapper then maps these calculated parameter values into a set of parameter values having the same coordinate system of the feedforward filter. Still further, in-band distortion may be filtered out of the power amplifier output signal before calculating the parameter values to more accurately model the distortion of the power amplifier.
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Glenayre Electronics, Inc.
Nguyen Patricia
Pascal Robert
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