Low-frequency white noise generators for biomedical systems.
There is a need for electronic noise sources for investigation of biological and medical research equipment. Such sources need to provide a "white noise" output with a frequency spectrum flat from one to one hundred Hertz. The present paper describes two designs of such sources. The spectra are measured and compared. One course is the reverse-biased junction of a transistor base-emitter junction operating in the avalanche mode. The second source is a MOS IC pseudo-random digital signal. In both cases, the spectra are presented. The choice between the two sources depends upon the application. For most applications, either source is shown to be satisfactory.
Singer
J R
JR
Oviedo
I
I
D004582:Electronics, Medical / Q000295:instrumentation*; D009622:Noise