Engineering › Electrical engineering
The asymptotic gain model (also known as the Rosenstark method) is a representation of the gain of negative feedback amplifiers given by the asymptotic gain relation: G=G∞(TT+1)+G0(1T+1), where T is the return ratio with the input source disabled (equal to the negative of the loop gain in the case of a single-loop system composed of unilateral blocks), G∞ is the asymptotic gain and G0 is the direct transmission term.
Engineering › Electrical engineering
Material property in which absorbing EM radiation increases electrical conductivity
Photoconductivity is an optical and electrical phenomenon in which a material becomes more electrically conductive due to the absorption of electromagnetic radiation such as visible light, ultraviolet light, infrared light, or gamma radiation.
Engineering › Electrical engineering
Time behavior of a system controlled by Heaviside step functions
The step response of a system in a given initial state consists of the time evolution of its outputs when its control inputs are Heaviside step functions.
Engineering › Electrical engineering
Graphical method of determining the stability of a dynamical system
In control theory and stability theory, the Nyquist stability criterion or Strecker–Nyquist stability criterion, independently discovered by the German electrical engineer Felix Strecker at Siemens in 1930 and the Swedish-American electrical engineer Harry Nyquist at Bell Telephone Laboratories in 1932, is a graphical technique for determining the stability of a linear dynamical system.
Engineering › Electrical engineering
The return ratio of a dependent source in a linear electrical circuit is the negative of the ratio of the current (voltage) returned to the site of the dependent source to the current (voltage) of a replacement independent source.
Engineering › Electrical engineering
Oscillating dynamical system with nonlinear damping
In the study of dynamical systems, the van der Pol oscillator (named for Dutch physicist Balthasar van der Pol) is a non-conservative, oscillating system with non-linear damping.
Engineering › Electrical engineering
Electronic circuit or test equipment
A pulse generator is a device that produces controlled bursts of energy characterized by attributes such as duration (commonly known as pulse width), rise and fall time, amplitude, and pulse repetition rate (frequency).
Engineering › Electrical engineering
Series of programmable logic controllers
SIMATIC is a series of programmable logic controller and automation systems, developed by Siemens. Introduced in 1958, the series has gone through four major generations, the latest being the SIMATIC S7 generation. The series is intended for industrial automation and production.
Engineering › Electrical engineering
Ratio of impedance of a loudspeaker
In an audio power amplifier, the damping factor is defined as the ratio of the rated impedance of the loudspeaker (usually assumed to be 8 Ω) to the source impedance of the power amplifier. It was originally proposed in 1941.
Engineering › Electrical engineering
Device for combining signals
An electronic mixer is a device that combines two or more electrical or electronic signals into one or two composite output signals. There are two basic circuits that both use the term mixer, but they are very different types of circuits: additive mixers and multiplicative mixers.
Engineering › Electrical engineering
Signal boosting phenomenon using white noise
Stochastic resonance (SR) is a mathematical mechanism and behavior of nonlinear systems (that is, systems in which the change of the output is not proportional to the change of the input) where random (stochastic) fluctuations in the microstate of a system (that is, its specific configuration,…
Engineering › Electrical engineering
Statistic used in signal detection theory
The sensitivity index or discriminability index or detectability index is a dimensionless statistic used in signal detection theory. A higher index indicates that the signal can be more readily detected.
