Self oscillating power amplifier

Details Self oscillating power amplifier Self oscillating power amplifier

2005-03-01

2005-03-01

Nguyen, Khanh Van (Department: 2817)

Amplifiers

Signal feedback

Frequency responsive feedback means

C330S069000

Reexamination Certificate

active

06861902

ABSTRACT:
A power amplifier includes a comparator (COMP) to which an input signal is applied, a digital buffer (BUF) coupled via a feedback low-pass filter (LPFB) to a second input terminal (Cin2) of the comparator (COMP). An unstable loop is thereby created with an oscillation frequency related to the bandwidth of the feedback low-pass filter. In the presence of an input signal this self-oscillation frequency linearizes the system resulting in a power amplifier with excellent power efficiency. In a differential version two of these self-oscillating loops are provided. The coupling of the two loops thereby withholds the high-frequency self-oscillation from the load.

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D. Su W. Mcfarland: “An IC for linearizing RF power amplifiers using envelope elimination and restoration” IEEE International Solid State Circuits Conference., Feb. 5-7, 1998, pp. 3.6-1-3.6-9, IEEE Inc. New York., NY.

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