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Noise generator

Noise sources are typically used in the fabrication and testing of microwave systems, such as receivers, for the purpose of determining the amounts of additional noise generated within such systems. Noise is commonly used in radio frequency (RF) and microwave environments. Efforts in the design of integrated circuits for radio frequency (RF) communication systems generally focus on improving performance, reducing cost or a combination thereof. Often in testing components such as microwave audio components, one or more source signals are generated with known characteristics, where one of these signals is then applied to a device so that the response to the signal may be evaluated, thereby providing data to characterize the device. A radio frequency or microwave noise source can be used to characterize components and devices, evaluate a system's dynamic range and sensitivity, and tune the performance of a system. In the RF and microwave bands, noise sources are typically constructed using noise tubes or solid-state noise diodes. Although some noise tubes can generate noise slightly above 100 GHz with limited bandwidth, these tubes suffer from limitations including short lifetime, poor stability, and require very high voltages to operate. Noise tubes are no longer in wide use because they have been succeeded by more compact and reliable solid-state noise diodes.

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