Noise measure-based design methodology for simultaneously matched multi-stage LNAs

A novel narrow-band design methodology for multi-stage low-noise amplifiers (LNAs) is presented which is based on noise measure and on appropriately designed reactive inter-stage networks. Design formulae are given, in particular, concerning the realisation of the latter networks in T and Π configurations, so as to make possible a partially automated design algorithm. As a test vehicle of the presented procedure, the design and realisation of a three-stage K-band LNA is discussed and the corresponding measured results are shown