Noise parameter transformations for three-terminal amplifiers

The common-emitter noise parameters and z parameters for a transistor (or any three-terminal amplifier) are used to obtain the corresponding sets of noise parameters for the common-base and common-collector configurations. It is shown that the three configurations must have the same minimum noise measure. A practical example is presented to confirm this invariance. High-gain amplifiers with the minimum noise figure can be built with any of the three configurations of combinations thereof. The choice of configuration is determined by factors such as ease of stabilization or bandwidth