文档介绍：Basic Circuit Theory
Chpter12 Problems
1 Find the four Y parameters of work shown in Fig. 12-19.
••
+
5 Ω 10Ω I 1 + I 2
•
+ Two
+ + I s ••
••• V 1 V 2
20 Ω 50Ω 40Ω R S port R L
V 1 V T V 2
- - - - -
Fig. 12-20 For .
Fig. 12-19 For .
2 Let R S = 1k Ω, y 11 =3 mS, y 12 = - 1 mS, y 21 = 24 mS, y 22 = mS, and R L = 4 k Ω for the
••
circuit shown in Fig. 12-20. Determine numerical values for: (a) voltage gain G V =V 2 /V 1 ; (b)
••••
current gain I 2 / I1 and I 2 / I S ; (c) power gain G P =P L /P S ; (d) input impedance
•••••
Z in =V 1 / I1 ; (e) output impedance Z out =V 2 / I 2 with I S = 0 and R L = ∞; (f) reverse voltage
•••
gain G VR =V 1 /V 2 with I S = 0 and R L = ∞.
3 (a) Find all the Y parameters for a two-port characterized by the equations: 6v 1 - 3i 2 = 0 and
5v 2 = 12i 1 + 2i 2 - 3v 1 . (b) Find new values for the Y parameters after a 5 Ω resistor is added
in series with one conductor of the output port.
4 For the amplifier circuit of Fig. 12-21, find the four Y parameters and the ratio of output power
to that supplied by the ideal voltage source.
10Ω 30Ω 200 Ω
+
+ • 1/ 0°A
+ 10I x •
•[Z]
• 500 Ω R L
1/ 0°V - 10Ω 2 100 Ω
1 V
V I x
-
-
Fig. 12-21 For . Fig. 12-22 For .
5 The block in Fig. 12-22 is described by the following open-circu