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Design Engineer Valued Creative Encyclopedia

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The component of the output noise power that arises from sources within the network under test. This component of output noise is usually differentiated from the component that comes from amplifying the noise that originates in the input source for the network.

Noise level (Random noise)
All modern digital oscilloscopes regardless of the manufacturer have a significant noise level. The amplitude of the noise displayed on the screen of a digital oscilloscope (itself or the noise of the signal under measurement) depends on many factors including the sampling rate, signal brightness, persistence (inertia of the screen refreshing) and on the oscilloscope bandwidth as well.

The temperature (Ta) that yields the available power spectral density from a source. It is obtained when the corresponding reflection coefficients for the generator and load are complex conjugates.

Ohm, Georg Simon
A German physicist. As a high school teacher, Ohm began his research with the recently invented electrochemical cell, invented by Italian Count Alessandro Volta. Using equipment of his own creation, Ohm determined that there is a direct proportionality between the potential difference (voltage) applied across a conductor and the resultant electric current. This relationship is now known as Ohm's law.


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