lecture 43 - 1 1 Summary of Lecture #43 12/08/2010 Hybrid...

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Unformatted text preview: 1 1 Summary of Lecture #43 12/08/2010 Hybrid parameters, [H] and h ij (s) Two-dependent source equivalent circuit Terminated two port circuits Z in , Y out , voltage gain and current gain Examples Transmission parameters, [T] and t ij (s) Terminated two port circuits Z in , Z out , voltage gain and current gain Examples Interconnect of two ports 2 Two-port circuits [Y] [Z] [H] [T] = 2 1 22 21 12 11 2 1 I I z z z z V V = 2 1 22 21 12 11 2 1 V V y y y y I I = 2 1 22 21 12 11 2 1 V I h h h h I V - = 2 2 22 21 12 11 1 1 I V t t t t I V S h 11 in , h 22 in S h 12 and h 21 are dimensionless. t 12 in , t 21 in S t 11 and t 22 are dimensionless. [Z]- 1 = [Y] 3 Meaning of open-circuited impedance parameters z 11 : input impedance at port 1 with port 2 opened z 21 : transfer impedance with port 2 opened z 22 : input impedance at port 2 with port 1 opened z 12 : transfer impedance with port 1 opened = 2 1 22 21 12 11 2 1 I I z z z z V V I 1 2 21 I 1 1 11 2 2 I V z , I V z = = = = I 2 1 12 I 2 2 22 1 1 I V z , I V z = = = = [z] I 1 V 1 +- +- V 2 z 11 [z] I 2 +- V 2 z 22 V 1 +- [z] I 1 I 2 V 1 +- +- V 2 4 Meaning of short-circuited admittance parameters y 11 : input admittance at port 1 with port 2 shorted y 21 : transfer admittance with port 2 shorted y 22 : input admittance at port 2 with port 1 shorted y 12 : transfer admittance with port 1 shorted = 2 1 22 21 12 11 2 1 V V y y y y I I [y] I 1 I 2 V 1 +- +- V 2 [y] I 1 I 2 V 1 +- y 11 [y] I 1 I 2 +- V 2 y 22 V 1 2 21 V 1 1 11 2 2 V I y , V I y = = = = V 2 1 12 V 2 2 22 1 1 V I y , V I y = = = = 5 Terminated two-port circuits where immi ttance stands for im pedance or ad mi ttance, and ij stands for z ij , y ij or h ij . . immit source . immit Output . immit load . immit Input 11 21 12 22 22 21 12 11 + - = + - = ] H [ or ] Z [ ], Y [ [Z], [Y] and [H] only, not [T] ....
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lecture 43 - 1 1 Summary of Lecture #43 12/08/2010 Hybrid...

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