Linearity vs. Q-factor of loads for RF amplifiers

Abstract

This paper analyzes and verifies that RF amplifier linearity as well as gain depend significantly on the quality of the output matching components or the loads (especially the inductor). Two amplifiers with off- and on-chip matching circuits are built and compared. Measurement results show that a driver amplifier with off-chip reactive output matching provides better linearity and gain of 3.6 dB and 1.6 dB respectively, as compared to that of the amplifier with on-chip matching. The amplifiers are implemented for 2.4-GHz operation based on 0.35-mum CMOS technology. (C) 2003 Wiley Periodicals, Inc.