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Unformatted text preview: 1 Summary of Lecture #40 12/01/2010 Definition of one- and two-port circuits Passive one-port circuits, Z(s) and Y(s) Active one-port circuits, Thevenin and Norton equivalent circuits Thevenin equiv. circuit by matrix partitioning Examples Definition of two-port circuits Open-circuited impedance parameters, [ Z (s)] and z ij (s) Short-circuited dmittance parameters, [ Y (s)] and y ij (s) Hybrid parameters, [ H (s)] and h ij (s) Transmission parameters , [ T (s)] and t ij (s) g parameters Final: 12/17/2010, Friday 1:00 to 3:00 PM SMTH 108 2 One-port circuits • A “port” has two leads or two terminals. • Current going into a terminal must leave from the other terminal of the same port all the time and under all circumstances or excitations. • Passive one-port circuits Z(s)=V 1 (s)/I 1 (s), Y(s)=I 1 (s)/V 1 (s) • Active one-port circuits Thevenin and Norton equivalent circuits. V s (s) = I s (s) Z th (s) + V oc (s) I s (s) = [ V s (s) / Z th (s)] - I sc (s) I s + _ V s Z(s) → 3 Two-port circuits • A two-port circuit has two sets of lead wires or two sets of terminals. → two ports • Current entering a terminal of a port must leave from the other terminal of the same port. • Open-circuited impedance parameters, [Z], z ij • Short-circuited admittance parameters, [Y], y ij • Hybrid parameters, [H], h ij • Transmission parameters, [T], t ij • g-parameters 2x2 matrices 4 Examples of passive two-port circuits R, R 1 , R 2 , R 3 → Z, Z 1 , Z 2 , Z 3 G 1 , G 2 , G 3 → Y 1 , Y 2 , Y 3 5 Metal oxide semiconductor FET (MOSFET) Junction FET (JFET) D:Drain, G:Gate, S:Source, B:Base, bulk or body Examples of active two-port circuits Bipolar Transistors (BJT) Common Common Common emitter collector...
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This document was uploaded on 01/13/2012.
- Spring '06