Title :
High-efficiency class-A power amplifiers with a dual-bias-control scheme
Author :
Yang, Kyounghoon ; Haddad, George I. ; East, Jack R.
Author_Institution :
Solid State Electron. Lab., Michigan Univ., Ann Arbor, MI, USA
fDate :
8/1/1999 12:00:00 AM
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 dual-bias control to maximize the power-added efficiency along with its inherent class-A linearity. The 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 circuits; UHF power amplifiers; impedance matching; mobile radio; bias current; class-A power amplifiers; digital bias control; dual-bias-control scheme; efficiency; input RF signals; linearity; power-added efficiency; High power amplifiers; Laboratories; Lifting equipment; Linearity; Mobile communication; Operational amplifiers; Power amplifiers; Radiofrequency amplifiers; Solid state circuits; Voltage control;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
