Using a low-voltage intermodulation distortion sweet-spot for controlling gain in HEMT amplifiers

In this paper, a low-voltage high-linearity sweet-spot, associated with an adjustable transconductance, is proposed for implementing a simple and highly linear HEMT-based gain control strategy. The proposed approach, based on a selective gate and drain biasing technique, is compared with the conventional solution under two-tone and multitone excitations. (C) 2003 Wiley Periodicals, Inc.