Preface

This note is about noise measurement. The material is common to most noise figure measurements or background material for this type of measurement.

Summery

The reason for measuring noise properties of networks is to minimize the problem of noise generated in receiving systems. Noise can make the measurement of weak signals unclear.

Noise Factor (F) is the ratio of the signal-to-noise power ratio at the input to the signal-to-noise power ratio at the output.

Noise Figure (NF) is defined as