Книга: Introduction to Microprocessors and Microcontrollers

Thermal noise

Thermal noise

The higher the temperature, the more mobile the electrons, the greater the random voltages and the more electrical noise is present. A solution:

High temperature = high noise


Low temperature = low noise.

Put the whole system into a very cold environment by dropping it in liquid nitrogen (about –200°C) or taking it into space where the ‘shade’ temperature is about –269°C. The cold of space has created very pleasant low noise conditions for the circuits in space like the Hubble telescope. On Earth most microprocessors operate at room temperature. It would be inconvenient, not to mention expensive, to surround all our microprocessor circuits by liquid nitrogen. And even if we did, there is another problem queuing up to take its place.

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