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February 17, 2004 wlg

**ECE 300 **

**Spring Semester, 2004 **

**HW Set #4 **

**Name__________________ **

Print (last, first)

**Use engineering paper. Work only on one side of the paper. Use this sheet as your cover sheet, placed on top of your work and stapled in the top left-hand corner. Number the problems at the top of the page, in the center of the sheet. Do neat work. Underline your answers.**

Show how you got your equations . Be sure to show how you got your answers. Each problem counts 5 points.

(1). Find V

0 in the op-am circuit of Figure 1. Ans. V

0

= 2 V

**2 k**

**50 k**

**1 mA**

**4 V**

**+**

**V**

**0**

**_**

**10 k**

**0.4 V**

**I**

**0**

**20 k**

Figure 1: Circuit for Extra 1. Figure 2: Circuit for Extra 2.

(2) Find I

0

in the op-amp circuit of Figure 2. Ans. I

0

= 120

A

(3) Find I

X

in the op-amp circuit of Figure 3. Ans. V

0

= 6 V, I

X

= -2 mA

**1 k**

**4 k**

** I**

**X**

**+**

**_**

**4 V**

**2 k**

**3 k**

**+**

**V**

**O**

_

Figure 3: Circuit for Extra-3.

4.10 Superposition: I

O

= 2.4 mA

4.26 Source Transformation: V

O

= - 0.3 V

4.33

Thevenin: V

O

= 4.8 V

4.40 Thevenin: V

O

= 6.86 V

4.xx Thevenin: Find the Thevenin equivalent circuit to the left of A-B in the circuit below and then find I

O

in the output resistor. Ans: V

TH

= 8 V, R

TH

= 4

, I

O

= (1/3) A.

**50**

**20**

**8**

**A**

**50**

** +**

**_ 20 V 1 A**

**5**

**12**

**I**

**O**

Figure 4.xx: Circuit for problem 4.xx.

4.50 Thevenin: V

TH

= 0 V, R

TH

= 1,000

4.62 Norton: I

O

= 2 mA, R

N

= 1.33 k

4.65 Norton: R

N

= 2.12 k

, I

N

= 5 mA, I

O

= 2.57 mA

4.69

Using Thevenin: V

OS

= V

TH

= 24 V, R

TH

= 4 k

, V

AB

= 20 V

4FE-1 Maximum Power Transfer: R

L

= 2 k

for maximum power transfer, P

L,max

= 8 mW