Media type: E-Article Title: Linearity improvement of three‐way Doherty amplifier using power tracking bias supply method Contributor: Lee, Yong‐Sub; Lee, Mun‐Woo; Jeong, Yoon‐Ha imprint: Wiley, 2008 Published in: Microwave and Optical Technology Letters Language: English DOI: 10.1002/mop.23198 ISSN: 0895-2477; 1098-2760 Keywords: Electrical and Electronic Engineering ; Condensed Matter Physics ; Atomic and Molecular Physics, and Optics ; Electronic, Optical and Magnetic Materials Origination: Footnote: Description: <jats:title>Abstract</jats:title><jats:p>This letter presents highly linear three‐way Doherty power amplifier (DPA) using power tracking bias supply method. The drain biases of carrier and peaking amplifiers and the gate biases of peaking amplifiers are adaptively controlled by the power tracking circuit according to average power levels of the input signal. For validation, a three‐way DPA is implemented using 30‐W Si LDMOSFETs and tested for two‐tone and 1‐carrier WCDMA signals at 2.14 GHz. The measured results show the notable linearity improvement over a wide output power range. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 728–731, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23198</jats:p>