In-line, unbalanced amplifier, predistortion circuit

Details In-line, unbalanced amplifier, predistortion circuit In-line, unbalanced amplifier, predistortion circuit

1998-09-17

2000-10-17

Mottola, Steven J.

Amplifiers

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

330165, H03F 126

Patent

active

061337900

ABSTRACT:
A plurality of amplifiers are connected in cascade to form an in-line predistortion circuit. The amplifiers are unbalanced in that each amplifier stage in the circuit has two DC voltage rails which are independently controlled to provide different, i.e. offset, DC voltage levels to the unbalanced amplifiers. This unbalance in the amplifiers generates predistortion in a signal which can be used to cancel the inherent distortion caused by a non-linear device which subsequently processes or transmits the predistorted signal. Control of the DC voltage offset in at least one of the amplifier stages is necessary to match the predistortion to the inherent distortion being corrected. A tilt circuit can be used in cascade with the plurality of amplifiers (in front of the RF amplifiers) to compensate the amplitude change caused by the unbalanced RF amplifiers. Either side of the DC voltage can be changed in order to correct for either sublinear or superlinear laser diode curves.

REFERENCES:
patent: 4011518 (1977-03-01), Irvine et al.
patent: 4532477 (1985-07-01), Green, Jr. et al.
patent: 4564816 (1986-01-01), Kumar et al.
patent: 4682119 (1987-07-01), Michel
patent: 5119392 (1992-06-01), Childs
Rodrigo Cordeiro Tupynamba et al. "Mesfet Nonlinearities Applied to Predistortion Linearizer Design," Intenational Microwave Symposium Digest 9MTT-S), US, New York, IEEE, vol.-, pp. 955-958 XP000343462.

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