ST02v03

ST02v03 - Types of electrical noises (i) Johnson Noise...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Types of electrical noises (i) Johnson Noise Johnson noise occurs in any device that dissipates power, such as resistor, hence it is very common. Principle of equipartition of energy states: For a system in thermal equilibrium with its surroundings : The mean kinetic energy of each degree of freedom is ½ kT , where k =Boltzmann’s constant (1.4×10 J/K) 1. 1 joule = 0.2388 calorie. It is named after James Joule. When the point of application of a force of one Newton moves, in the direction of the force, a distance of one metre. 2. Boltzmann's constant ( k ): The number that relates the average energy of a molecule to its absolute temperature. 3. T = the absolute temperature (thermodynamic temperature): A measure, in Kelvin (K), proportional to the thermal energy of a given body at equilibrium. -23
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Note 1: A temperature of 0 K is called "absolute zero," and coincides with the minimum molecular activity ( i.e. , thermal energy) of matter. Note 2: Thermal noise power, per hertz, is equal throughout the frequency spectrum, depending only on k and T . Note 3: For the general case, the above definition may be held to apply to charge carriers in any type of conducting medium. The electrons in a conductor thus have a mean square velocity (in one
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 12

ST02v03 - Types of electrical noises (i) Johnson Noise...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online