Chapter 444

A broadband random noise generator

Jim Williams


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


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.

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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