Amplifiers – Hum or noise or distortion bucking introduced into signal...
Reexamination Certificate
2005-04-19
2005-04-19
Nguyen, Khanh V. (Department: 2817)
Amplifiers
Hum or noise or distortion bucking introduced into signal...
C375S296000, C455S063100
Reexamination Certificate
active
06882221
ABSTRACT:
Apparatus and a corresponding method for predistorting an input signal applied to a radio frequency (RF) power amplifier, to compensate for amplifier distortion at high powers. The RF amplifier input and output signals are continuously monitored and difference signals are generated in an RF phase discriminator. The difference signals are converted to digital form and stored in a lookup table in the form of running averages of an RF amplifier gain compression value and an RF amplifier output phase value for each observed RF input power value. A predistorter module retrieves these values and predistorts the RF amplifier input by way of compensation.
REFERENCES:
patent: 5867065 (1999-02-01), Leyendecker
patent: 5892397 (1999-04-01), Belcher et al.
patent: 6141390 (2000-10-01), Cova
patent: 6246286 (2001-06-01), Persson
Becker James C.
Schreyer George W.
Heal Noel F.
Northrop Grumman Corporation
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