Electronics Engineering (ELEX) Board Practice Exam

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What do coefficients with dimensions of admittance refer to?

G-parameters
Z-parameters
Y-parameters
S-parameters

The correct answer is: Y-parameters

Coefficients with dimensions of admittance refer to Y-parameters. Y-parameters, also known as admittance parameters, are fundamental in the analysis of two-port networks in electronics. They define the relationship between the currents flowing into and out of the ports of the network and are represented in terms of admittance, which is the inverse of impedance. In a Y-parameter model, the relationship is expressed as a matrix that relates the input currents to the output voltages. The parameters are denoted as Y11, Y12, Y21, and Y22, where Y11 represents the input admittance with the output port open, Y22 is the output admittance with the input port open, and Y12 and Y21 describe the transfer characteristics between ports. Understanding Y-parameters is crucial for analyzing how a circuit behaves in terms of current and voltage, especially in high-frequency applications.