The avalanche noise is very similar to shot noise, but much more intense and has a flat frequency spectrum (white). It is created when a PN junction is operated in the reverse breakdown mode. This white noise generator is based on the avalanche noise generated by a zener breakdown phenomenon. The design idea presented in this article is an inexpensive method that produces white noise up to several hundred MHz. Commercially available white noise generators are usually very expensive. White noise, which is defined as noise with constant power spectrum, is useful for measuring and testing wide-band communication circuits. The test results show that a fairly wideband white noise can be generated using several inexpensive components. ![]() Two low-noise amplifiers (LNAs) in cascade amplify the noise produced by a reverse-biased Zener diode operating in junction-breakdown mode, producing white noise with a bandwidth of several hundred megahertz. A design idea for a white-noise generator is realized and revised.
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