By Topic

Efficiency optimization in linear-assisted switching power converters for envelope tracking in RF power amplifiers

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Yousefzadeh, V. ; Dept. of Electr. & Comput. Eng., Colorado Univ., Boulder, CO, USA ; Alarcon, E. ; Maksimovic, D.

Linear-assisted switchers are based on the idea of combining high efficiency of switching converters with wide-bandwidth capabilities of linear amplifiers. Such linear-assisted switching power converters have been proposed for implementation of wide-bandwidth envelope-tracking power supplies for RF power amplifiers in polar modulation architectures. This paper presents modeling of the overall linear-assisted switcher efficiency as a function of the band separation frequency between the signals processed by the switching and the linear parts. The efficiency model, which is based on the statistical amplitude distributions of the signals, is used to derive the optimum band separation frequency to maximize the overall efficiency. Application examples, including a two-tone test and a CDMA signal in a polar modulation RF transmitter, are presented to illustrate the approach.

Published in:

Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on

Date of Conference:

23-26 May 2005