✦ LIBER ✦

A high-efficiency power amplifier using multilevel digital pulse modulation

✍ Scribed by Hyunjin Kim; Youngsang Jeon; Jaejun Lee; Sungho Lee; Sangwook Nam

Publisher: John Wiley and Sons
Year: 2009
Tongue: English
Weight: 331 KB
Volume: 51
Category: Article
ISSN: 0895-2477
DOI: 10.1002/mop.24494

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✦ Synopsis

Abstract

This article introduces a new architecture for a high‐efficiency linear transmitter using a pulse modulated envelope signal. The transmitter employs multilevel PWM to represent the baseband signal. By using multilevel PWM, the efficiency of the power amplifier can be improved compared with that using the conventional PWM. To demonstrate the validity of the proposed architecture, a transmitter using three‐level PWM is implemented and tested with the CDMA IS‐95A signal. The measured PAE, including isolator and filter loss, is 37.6% at 21.6 dBm average output power and the linearity requirements are satisfied. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1921–1924, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24494

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