Chapter 444

A broadband random noise generator

Jim Williams

Abstract

A random noise generator with selectable bandwidth and RMS voltage regulation is described.

Keywords

Random noise generator

Filter, audio and RF communication testing often requires a random noise source. The circuit in Figure 444.1 provides an RMS amplitude regulated noise source with selectable bandwidth. The RMS output is 300mV with a 1kHz to 5MHz bandwidth selected in decade ranges.

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Figure 444.1 Random Noise Generator with Selectable Bandwidth and RMS Voltage Regulation

The A1 amplifier, biased from the LT1004 reference, provides optimum drive for D1, the noise ...

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