Two Port Networkon 24/2/2012 & Updated on Friday 27th of April 2018 at 02:57:56 PM
A single phase transformer is an ideal example of two port network. When an electrical signal is applied to the input port of the network, there would be an electrical output signal.
The relation between input and output signals of the network can be determined by transfer various network parameters, such as, impedance, admittance, voltage ratio and current ratio. Let us refer to the figure below,
Here in the network, The transform voltage ratio function is, The transfer current ratio function is,
The transfer impedance function is, The transfer admittance function is,
Parameters of Two Port NetworkThere are different parameters, needed to analyze a two port network. For examples, Z parameters, Y parameters, h parameters, g parameters, ABCD parameters etc. Let us discuss one by one in brief for better understanding.
Z ParametersZ parameters are also known as impedance parameters. When we use Z parameter for analyzing two part network, the voltages are represented as the function of currents. So, The Z parameters are, The voltages are represented as
Y ParametersY parameter is dual of Z parameter. In the two part network represented by admittance, the current and voltage related by the following equations,
h Parameterh parameters also known as hybrid parameters. In hybrid parameter circuit, voltage gain, current gain, impedance and admittance are used to determines relation between current and voltage of two port network.
ABCD ParameterThese are also called transmission parameters. Here, voltage and current and of input part are expressed in term of output part.
Here, In matrix form it can be written as,
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