202_HW_set8 - EE202 DUE MONDAY APRIL 27 HOMEWORK PROBLEMS...

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EE202 HOMEWORK PROBLEMS SPRING 09 D UE M ONDAY A PRIL 27 73 . Numbers are probably NOT nice. (a) Find the y-parameters of the circuit below. (b) Find the z-parameters of the circuit below if g m 2 [S], n 2 , Y 1 Y 2 0.2 [S], Y 3 =0.5s [S]. (c) If the secondary is terminated in a 10 resistor and the primary is attached to a current source pointing up, find the impulse response v 2 ( t ) . 74. The 2-port configuration below has the indicated y-parameters in S. Suppose V 1 V s 2 s 6 and R s 1 . (a) Find y 11 if , y 21   1 S, y 12 0.75 S, y 22 0.25 S, and R L 8 . (b) Find Y out ( s ) . (c) Determine the voltage gain G v V 2 V s . (d) If v s ( t ) 30 u ( t ) V, find v 2 ( t ) and the power, p L ( t ) , absorbed by R L . 75. In a laboratory, you are asked to determine the admittance parameters of a circuit. You decide to short circuit port-2, place a unit step current source at port 1, and measure the port voltage, v 1 ( t ) (1 e 4 t ) u ( t ) V, and the port-2 current, i 2 ( t )   e 3 t u ( t ) A.
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