Power amplifying apparatus and radio communications...

Details Power amplifying apparatus and radio communications... Power amplifying apparatus and radio communications...

2005-05-31

2005-05-31

Mottola, Steven J. (Department: 2817)

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

C330S136000

Reexamination Certificate

active

06900693

ABSTRACT:
By extracting a portion of RF signals from an input side of a multistage RF amplifier with a detector, and converting extracted signals into envelope signals, low-frequency second-harmonic distortion components are efficiently extracted. Then, the extracted low-frequency second-harmonic distortion components are amplified with a low-frequency amplifier, and phase adjusted with a phase shifter, after which they are injected into a gate or base bias of the final stage of the multistage RF amplifier. As a result, the low-frequency second-harmonic distortion components are converted into third-harmonic distortion due to the non-linearity of transistors, and the third-harmonic distortion thus obtained cancels out the third-harmonic distortion originally present in the multistage RF amplifier.

REFERENCES:
patent: 6650181 (2003-11-01), Shinjo et al.
patent: 6714071 (2004-03-01), Page
patent: WO0203545 (2002-01-01), None

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