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Stability and noise performance of resistively loaded microwave amplifiers

Resistive loading is a classic technique to guarantee the unconditional stability of microwave amplifiers at the operating frequency, but the amplifier is potentially unstable at other frequencies. A technique is proposed to predict microwave amplifier stability at all frequencies by solving for the stability parameter of the overall cascaded resistor/transistor network. Eight different stabilizing networks are investigated and shown to have very different stabilizing effects as a function of frequency. A method to determine the effect of resistive stabilization on amplifier‐noise performance is presented. These results allow the designer to choose a stabilizing resistor network that provides the best compromise between gain, noise, and stability for a desired application. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 41: 228–231, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20101