Comprehensive study of multiband unconditional stabilization of common-source and common-gate MESFET transistors using feedback

The use of a new feedback scheme to achieve unconditionally stable MESFET transistors from 0 GHz until cutoff is presented. The methodology is applied for both common-source and common-gate MESFET transistor configurations. Analytical formulation of the stabilization methodology is presented. In addition, two coplanar-waveguide-based amplifiers were designed to operate at Ka-band, monolithically fabricated, and tested, thus, verifying the methodology. The study includes the effects of the bias change on the feedback amplifier stability performance.