Adaptive digital predistortion linearization and feed-forward co

Details Adaptive digital predistortion linearization and feed-forward co Adaptive digital predistortion linearization and feed-forward co

1996-09-20

1999-04-27

Mottola, Steven

Amplifiers

Hum or noise or distortion bucking introduced into signal...

330151, H03F 126

Patent

active

058983384

ABSTRACT:
A digitally implemented, look-up table-based, predistortion and feed-forward correction signal processing mechanism compensates for distortion generated in the RF power amplifier. The input signal to the RF amplifier is stored for comparison with the measured the RF output. In each of predistortion and feed-forward signal processing paths, the magnitude of the complex waveform of the input signal is extracted to derive a read-out address to a dual-port RAM which stores weights to be multiplied by the input signal. In the predistortion signal processing path, the product is coupled to the RF power amplifier. In the feed-forward correction loop, the product is amplified by an auxiliary feed-forward RF amplifier and coupled into the amplified output signal path of the RF power amplifier.

REFERENCES:
patent: 4291277 (1981-09-01), Davis et al.
patent: 5650758 (1997-07-01), Xu et al.
"Adaptive Digital Predistorter for Power Amplifiers with Real Time Modeling of Memoryless Complex Gains" by Jeckeln et al; 1996 IEEE MTT-S Digest, pp. 835-838.

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