Cuber based predistortion circuit and mobile station using the s

Details Cuber based predistortion circuit and mobile station using the s Cuber based predistortion circuit and mobile station using the s

1996-06-27

1998-07-28

Mullins, James B.

Amplifiers

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

330151, 455 63, 455 89, 455 95, 375297, H03F 132

Patent

active

057867283

ABSTRACT:
The invention is related to a balanced cuber based predistortion circuit for predistorting an input signal (v.sub.in), comprising a squarer (11) to produce a second order signal and signal dividing means (10', 14') for dividing the input signal and second order signal into differential signals. To produce a third order signal, the input signal and second order signal are mixed in multipliers (15, 16) and the output signals of the multipliers are combined in order to eliminate undesired components. According to the invention, the squarer also includes differential signal handling and combining means (12, 13), advantageously a push-push frequency doubler to produce a second order signal using differential signals. The phase (17) and amplification (18) of the third order signal are adjusted in order to produce a distortion compensation signal, and the input signal (v.sub.in) and distortion compensation signal are combined (19) to produce a predistorted output signal (v.sub.1).

REFERENCES:
patent: 3825843 (1974-07-01), Felsberg et al.
patent: 4157508 (1979-06-01), Hecken
patent: 4532604 (1985-07-01), Baker
patent: 4870371 (1989-09-01), Gottwald et al.
patent: 4992754 (1991-02-01), Blauvelt et al.
patent: 5164884 (1992-11-01), Pesola
patent: 5172068 (1992-12-01), Childs
IEEE Trans.Veh.Technol., Vol. VT-34, No. 4, Nov. 1985, T. Nojima et al, "Cuber predistortion linearizer for relay equipment in 800 MHz band land mobile telephone system" p. 169 -p. 177.

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