Doherty amplifier with improved linearity

Details Doherty amplifier with improved linearity Doherty amplifier with improved linearity

2006-10-17

2008-09-23

Mottola, Steven J (Department: 2817)

Amplifiers

With plural amplifier channels

Redundant amplifier circuits

C330S136000

Reexamination Certificate

active

07427895

ABSTRACT:
A first control unit controls a bias applied to the peak amplifier to (a) make a peak amplifier operate as class C when the level of the input signal is lower than a first threshold value, to (b) make the peak amplifier operate as class AB with a second conduction angle substantially equal to a first conduction angle, when the level of the input signal is higher than a second threshold value higher than the first threshold value, and to (c) make the peak amplifier operate as class AB with a third conduction angle smaller than the first conduction angle, when the level of the input signal is not less than the first threshold value and not more than the second threshold value.

REFERENCES:
patent: 6639464 (2003-10-01), Hellberg
patent: 6853244 (2005-02-01), Robinson et al.
patent: 2004-96729 (2004-03-01), None
patent: 2004-173231 (2004-06-01), None
patent: 2005-516524 (2005-06-01), None
T. J. Jeong, T. H. Kim, I. S. Chang and C. D. Kim, “A Doherty Amplifier with a Bias Adaptation Technique Based on SDR Transmitter Architecture”,Microwave Journal, V. 48:9 (2005), pp. 140-158.

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