In electronics, a constant phase element is an

equivalent electrical circuit In electrical engineering and science, an equivalent circuit refers to a theoretical electrical network, circuit that retains all of the electrical characteristics of a given circuit. Often, an equivalent circuit is sought that simplifies calculatio ...

component that models the behaviour of a double layer, that is an imperfect capacitor (see double-layer capacitance). Constant phase elements are also used in equivalent circuit modeling and data fitting of electrochemical impedance spectroscopy data. A constant phase element also currently appears in modeling the imperfect dielectrics' behavior. The generalization in the fields of imperfect electrical resistances, capacitances, and

inductance Inductance is the tendency of an electrical conductor to oppose a change in the electric current flowing through it. The flow of electric current creates a magnetic field around the conductor. The field strength depends on the magnitude of the ...

s leads to the general "phasance" concept: http://fr.scribd.com/doc/71923015/The-Phasance-Concept

General equation

The electrical impedance can be calculated: :

Z_=\frac=\frace^

where the CPE admittance is:

Y_=Q_0(\omega i)^n

and Q₀ and n (0 Q₀ = 1/, Z, at ω = 1 rad/s The constant phase is always −(90*n)°, with n from 0 to 1. The case n = 1 describes an ideal capacitor while the case n = 0 describes a pure

resistor A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active el ...

References

Electronic circuits Linear electronic circuits {{Electronics-stub