Apparatus and method for providing a baseband digital error sign

Details Apparatus and method for providing a baseband digital error sign Apparatus and method for providing a baseband digital error sign

1995-02-28

1996-01-23

Mullins, James B.

Amplifiers

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

332103, 375297, 455 63, H03F 132

Patent

active

054867894

ABSTRACT:
The present invention provides an apparatus (200) and method (500) for providing a baseband digital error signal in an adaptive predistorter. A carrier cancellation circuit (202) provides a difference (212) between a first signal (208) based on an amplifier output and second signal (210) based on a data input. A quadrature demodulator (204) provides a baseband analog error signal (214) based on the difference (212). An analog-to-digital converter (206) provides the baseband digital error signal (216) based on the baseband analog error signal (214).

REFERENCES:
patent: 3900823 (1975-08-01), Sokal et al.
patent: 4291277 (1981-09-01), Davis et al.
patent: 5049832 (1991-09-01), Cavers
A. A. M. Saleh and J. Salz, "Adaptive Linearization of Power Amplifiers in Digital Radio Systems", The Bell System Technical Journal, vol. 62, No. 4, Apr. 1983, pp. 1019-1033.

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