Nyquist's theorem

Nyquist's theorem

[′nī‚kwists ‚thir·əm]
(electronics)
The mean square noise voltage across a resistance in thermal equilibrium is four times the product of the resistance, Boltzmann's constant, the absolute temperature, and the frequency range within which the voltage is measured.
References in periodicals archive ?
Specifically, Nyquist's Theorem tells us a digital sampling system must capture more than two samples per cycle in order for the instrument to be able to reconstruct the proper signal frequency.