Title :
Automatic control of efficiency and linearity in power amplifiers for low-power wireless communications
Author :
Kyounghoon Yang ; East, J.R. ; Haddad, G.I.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA
Abstract :
A new scheme for power amplifiers is proposed, which can provide both high efficiency and linearity. The proposed amplifier operates in a virtual Class-A mode under novel dual bias control to maximize the power-added efficiency along with its inherent Class-A linearity. The new dynamic dual bias control involves controlling both bias current and voltage of the amplifier with a varying envelope of input RF signals. The efficiency of the proposed amplifier is theoretically evaluated and compared with that of other conventional amplifier schemes. Based on theoretical analyses, several promising schemes for dual analog and digital bias control are proposed and discussed.
Keywords :
UHF power amplifiers; low-power electronics; microwave power amplifiers; mobile radio; bias current; dual analog/digital bias control; dual bias control; inherent Class-A linearity; input RF signals; low-power wireless communications; power amplifiers; power-added efficiency; virtual Class-A mode; Automatic control; Automatic frequency control; Batteries; High power amplifiers; Knee; Linearity; Power amplifiers; Radiofrequency amplifiers; Voltage control; Wireless communication;
Conference_Titel :
Silicon Monolithic Integrated Circuits in RF Systems, 1998. Digest of Papers. 1998 Topical Meeting on
Conference_Location :
Ann Arbor, MI, USA
Print_ISBN :
0-7803-5288-2
DOI :
10.1109/SMIC.1998.750204
