Skip to Main Content
This brief describes the influences of the source and load impedance matrices on the main small-signal and noise characteristics of a multiple-input-port and multiple-output-port (MIPMOP) device. Expressions for the noise figures of an MIPMOP device are provided in the impedance and admittance representations. We define the natural noise figures as the noise figures evaluated in the case where the multiport source behaves like a noisy passive network at the temperature T 0. This theory is applied to a multiple-input and multiple-output series-series feedback amplifier (MIMO-SSFA), some characteristics of which are computed and measured.