2006 EJRNL PP H. Pekau and J.W. Haslett 1.pdf?
Terbatas Irwan Sofiyan
» ITB
Terbatas Irwan Sofiyan
» ITB
A new modified form of the Friis equation for the noise figure of a cascade of stages that
can be used when one or more of the stages in the cascade have noise-aliasing properties is derived.
The application of the modified noise figure equation in the noise analysis of a subsampling receiver
front-end is given and the equation is verified in a circuit-level simulation. The modified Friis
equation gives insight into the noise behaviour of subsampling radio receiver architectures and
shows that the very high noise figures often associated with subsampling mixers can be misleading
in a system context.