Y- parameter

presented by-

Bhupendra Kumar

Y parameters of two port networks are known as short circuit admittance parameters.

Y parameters are used to describe the behavior of linear electrical systems.

Y parameters

Short circuit admittance or (y) parameters

I1=Y11V1+Y12V2 ……………… 1

I2=Y21V1+Y22V2 ………………. 2

The constants Y 11, Y 12, Y 21, and Y 22 are called the

admittance or Y-parameters of the two-port network.

Equations (1) and (2) are called the standard equation or defining equations of the Y-parameters.

Now if V 1 = 0 the input port is short circuit

and

if V2 = 0 the output port is short circuit

Y 11 and Y 22 are driving-point admittance at port 1 and port 2.Y 12 and Y 21 are known as transfer admittance.Y 11 is known as short circuit input admittance.Y 12 is known as short circuit reverse transfer admittance.Y 21 is known as short circuit forward transfer admittance.Similarly, Y 22 is known as short circuit output admittance.

Find the Y parameters for the two-port network shown

The admittance parameters describe the currents in

terms of the voltages

Admittance parameters are short circuit parameters.

They are also used to find small signal stability of a system.

summary