Automatic measuring system for electronic noise and its performance

Currently, most of the noise instruments can only give a noise figure or equivalent input noise at several frequency points or several fixed frequency bands. In this paper, an automatic system for measuring electronic noise and performance factors is presented. The system gives not only the power spectral density of equivalent input noise voltage and current, but also other noise performance factors. High accuracy of noise measurements is obtained by using a low-noise amplifier and using scanning C.W. signals to measure transfer functions. The noise measurements and processed data are automatically produced by a personal computer.