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
so:
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.
Оглавление книги
- The noise problem
- A complete cure for electrical noise
- Thermal noise
- Partition noise
- How much noise can we put up with?
- Using just two digits
- How do we count?
- The basic basis of bases
- Counting with only two figures
- Confusion and the cure
- Converting denary to binary
- Converting binary to denary
- Bits, bytes and other things
- Quiz time 2