High efficiency linear microwave power amplifier

Details High efficiency linear microwave power amplifier High efficiency linear microwave power amplifier

2008-10-24

2010-12-14

Nguyen, Khanh V (Department: 2817)

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

C330S129000, C330S285000, C330S311000

Reexamination Certificate

active

07852153

ABSTRACT:
A post-distortion method for cascading amplifier stages in a two-stage microwave power amplifier and a dynamic biasing method using back-end processing for correcting nonlinearity in the power amplifier output. A first or driver stage biased in a near-A region with low distortion is cascaded with a second or power stage biased in a near-C region with high efficiency. The amplitude and phase responses of the two stages compensate another to yield a more linear overall gain for the overall power amplifier. The dynamic biasing scheme modulates the source to drain voltages of the transistors used in the amplifier stages based on the harmonics in amplifier output in order to minimize the harmonics and correct non-linearity in the output.

REFERENCES:
patent: 5589796 (1996-12-01), Alberth et al.
patent: 5604924 (1997-02-01), Yokoya
patent: 6020787 (2000-02-01), Kim et al.
patent: 6794935 (2004-09-01), Klomsdorf et al.
patent: 7170341 (2007-01-01), Conrad et al.
patent: 2003/0058045 (2003-03-01), Taylor et al.

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