Recommended Citation
United States Patent Number: 7,135,931, November 14, 2006.
NOTE: At the time of publication, the author Vladimir Prodanov was not yet affiliated with Cal Poly.
Abstract
Power amplifiers are disclosed that demonstrate improved linearity and efficiency in applications requiring significant peak-to-average ratios (PAR). A power amplifier in accordance with the present invention comprises a first transistor in an input stage that converts DC power into AC power; and a second transistor in a negative conductance stage that has a current-voltage characteristic with at least two slopes. The at least two slopes of the current-voltage characteristic are separated by a break point that may be controlled. The power amplifier may also include a non-dissipative two-port device that has two AC ports. The non-dissipative two-port device has a Z matrix with two zero-valued diagonal elements and two complex valued off-diagonal elements having a same sign and only imaginary parts for an operating frequency. In one implementation, the diagonal entries of the Z matrix are small at twice the operating frequency.
Disciplines
Electrical and Computer Engineering
Number of Pages
15
Publisher statement
Also available from the United States Patent and Trademark Office. Website: http://www.uspto.gov.
Included in
URL: https://digitalcommons.calpoly.edu/eeng_fac/158