# Chapter 18 - Chapter 18 Two-port Networks the four...

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Chapter 18 Two-port Networks

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four-terminal network the four terminals have been paired into ports two-port network At all times, the instantaneous current flowing into one terminal is equal to the instantaneous current flowing out the other. KCL i1 i2 i3 i4 i1 i4 i1+i2+i3+i4=0(KCL) i1=-i2 ; i3=-i4
2 22 1 21 2 2 12 1 11 1 2 22 1 21 2 2 12 1 11 1 V y V y I V y V y I I z I z V I z I z V + = + = + = + = 2 22 1 21 2 2 12 1 11 1 2 22 1 21 2 2 12 1 11 1 I g V g V I g V g I V h I h I V h I h V + = + = + = + = 1 1 2 1 1 2 2 2 1 2 2 1 dI cV I bI aV V DI CV I BI AV V - = - = - = - = The network is linear(without independent sources).

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Impedance or z parameters are defined by impedance matrix Z 2 22 1 21 2 2 12 1 11 1 I z I z V I z I z V + = + = 0 22 0 21 0 12 0 11 1 2 2 2 1 2 1 2 1 2 1 1 = = = = = = = = I I V I I V I I V I I V z z z z Open-circuit input impedance. Open-circuit transfer impedance from port 1 to port 2 Open-circuit transfer impedance from port 2 to port 1 Open-circuit output impedance. 2
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Chapter 18 - Chapter 18 Two-port Networks the four...

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