EE 233 home

Homework policy

Homework grading

Homework 1

Homework 2

Homework 3

Homework 4

Homework 5

Homework 6

Homework 7

Homework 8

Homework scores

EE 233 Winter 2001

Circuit Theory

Homework Assignments

Homework policy

  1. Homeworks are assigned each Friday and due the subsequent Friday. The homework must be turned in no later than the end of the class lecture on Friday.
  2. Absolutely no late homework accepted since the homework solution will be posted on this web site on the same day.
  3. Problems are assigned from the textbook. Additional questions or problems outside the textbook are explicitly stated in the assignments.
  4. Students are permitted and encouraged to work on homeworks in groups so they can learn various problem-solving techniques from each other.
  5. Please write your name and your section clearly.

The homework solution must be turned in individually.

Homework grading

The Grader is Chris Sugg, csugg@u.washington.edu. Please direct all homework grading questions to Chris.

All late homeworks automatically receive zero score since the homework solution will be posted on this web site on the Friday due date, after the end of the class lecture.

Grading guidelines (applicable for homework 2 and later):

  1. Each problem will be given a maximum point value based on difficulty and length.
  2. Roughly 80% of the points in a problem will be awarded for "working" the problem. Most importantly this includes working out the problem using the correct method(s), but also includes a small factor of effort.
  3. 20% of the points will be awarded for the correct answer.
  4. Problems not showing any work will receive zero point.

NOTE on solutions:

  1. Textbook solutions sometimes have errors. If you suspect possible errors, please notify the instructor and the TAs.
  2. There are many methods to solve a problem. A method used in the textbook solution or by the TAs or by the instructor should not be interpreted as the only "right" way to solve a problem.

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Homework 1

Assigned on Friday 01/05, due Friday 01/12 in class.

1. Problem P 6.5-9

2. Problem P 8.4-6

3. Problem P 8.7-11

4. Problem P 9.9-10

Solution given in the manual for P 9.9-10 is

i(t) = e-0.817t [ 2.37 cos(0.365t) + 7.14 sin(0.365t) ] + 6 + 0.65 e-2t A

5. Problem P 9.10-4

6. "Tone-dialing" is the most popular signaling method in telephones or modems. When a telephone button is pushed, a set of signal frequencies (called "tones") are sent to the network. Look up information about telephones or modems (provide references where you look it up) and find out which frequency (or frequencies) is sent when the telephone button "8" is pressed.

Solution to Homework 1 (posted Friday 01-12, 2:35 PM)

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Homework 2

Assigned on Friday 01/12, due Friday 01/19 in class.

1. Problem P 10.7-4

2. Problem P 10.10-8

3. Problem P 10.11-5

4. Problem P 10.11-8

5. Problem P 10.14-2

Solution to Homework 2 (posted Friday 01-19, 3:35 PM)

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Homework 3

Assigned on Friday 01/19, due Friday 01/26 in class.

1. Problem P 10.11-11

2. Problem P 10.14-4

3. Problem DP 10-1 modified as follows:

  • Before specifying component values, you must provide the equations used to compute R1, R2, and C (75% of credit).
  • Specify component values for R1, R2, and C (25% of credit).

Components must be available from the EE Stores catalog (EE homepage -> EE Stores (on left panel) -> EEStores catalog (on left panel) -> Stores Catalog Index (first text sentence); or go directly to:

http://www.ee.washington.edu/stores/catalog/eecatidx.htm )

4. Problem DP 10-4

5. Problem P 11.3-5

6. Problem P 11.3-7

Solution to Homework 3 (posted Friday 01-26, 3:00 PM). Note that in Problem DP 10-1, the textbook solution has a typo (R2/R1 =13.2, not 132). The values picked by the textbook are not unique. For Problem DP 10-4, the last sentence of the solution should read: "This condition cannot be satisfied with positive component values."

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Homework 4

Assigned on Friday 01/26, due Friday 02/09 (NOT Friday 02/02 -- midterm day) in class.

1. Problem P 11.4-2

2. Problem P 11.8-6

3. PSPICE Problem SP 10-2 modified as follows:

a) Solve the problem by hand and use any plotting tool you know (e.g. Excel, Matlab, etc.) to plot vo(t).

b) Run PSPICE and get the plot for vo(t). Compare with the plot in part (a) and comment on differences.

4. PSPICE Problem SP 10-9 modified as follows:

a) Solve the problem by hand and use any plotting tool you know (e.g. Excel, Matlab, etc.) to plot i(t).

b) Run PSPICE and get the plot for i(t). Compare with the plot in part (a) and comment on differences.

5. Problem P 14.3-1

6. Problem P 14.3-2

Solution to Homework 4 (posted Friday 02-09, 3:00 PM)

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Homework 5

***

Due to heavy snow on Friday 02-16, Homework 5 will be due on Wednesday 02-21 in class. NO late homework accepted after 2:20 PM on Wednesday. Solution will be posted late on Friday 02-23.

***

Assigned on Friday 02/09, due Friday 02/16 in class.

1. Problem P 14.4-2

2. Problem P 14.5-3

3. Problem P 14.5-4

4. Problem P 14.7-3 modified as follows:

a. Solve the problem by hand and use any plotting tool you know (e.g. Excel, Matlab, etc.) to plot the output voltage across the capacitor.

b. Run PSPICE and get the plot for the output voltage across the capacitor. Compare with the plot in part (a) and comment on differences.

HINTS:

* When you use VSIN to specify the input signal, remember that FREQ in PSPICE is the frequency f (in Hz), and PHASE is in degree. Specify correct values for the parameters of VSIN. Otherwise, the input signal is incorrect and thus your output signal does not match your calculation.

* Note that the u(t) in 2cos(2t) u(t) only means that the cosine signal starts at time t=0 (there is no signal for negative time values). So you do not need to do anything about u(t) in the simulation.

5. Problem P 14.8-5

6. Problem P 14.8-6 modified as follows:

a. Solve the problem by hand and use any plotting tool you know (e.g. Excel, Matlab, etc.) to plot the output voltage.

b. Run PSPICE and get the plot for the output voltage. Compare with the plot in part (a) and comment on differences.

HINTS:

* The only input signal is the step 10 u(t). For time t>0, this looks like a DC signal at 10V, so you can use a DC source to model u(t). Or you can use the technique below.

* Another way to model 10 u(t) in PSPICE is to use the VPWL source signal (from the SOURCE library) and edit the property of this part to specify these values:

property name

value

T1

0

V1

0

T2

0.1ms

V2

10

T3

4ms

V4

10

* The initial condition on the capacitor can be specified by "Place" a part named "IC1" (from the SPECIAL library). Place a wire to connect this part to the output side of the capacitor, and edit the property of the part to specify Value = 5. If you only change the text "IC=" to "IC=5", PSPICE does *not* set the initial condition to 5V!! You need to edit the property of this part as described above.

* Use the "uA741" part from the EVAL library for the opamp.

Solution to Homework 5 (posted Friday 02-23, 4:45 PM)

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Homework 6

Assigned on Friday 02/16, due Friday 02/23 in class. This due date is NOT changed.

1. Problem P 14.9-8

2. Problem P 14.9-13

3. Problem P 14.9-16

4. Problem DP 14-2, modified as follows:

a. Do the design as specified in the problem statement by selecting the values for k, R, L, and C.

b. Run PSPICE and get the plot for the output voltage, assuming a step input. Is the PSPICE output voltage identical to the required output specified in the statement of the problem? Discuss differences.

HINTS:

* Use Part named "E" for the controlled source.

5. Problem P 13.3-3

6. Problem P 13.3-9, modified as follows:

a. Do the design as specified in the problem statement by selecting the values for R1 and R2.

b. Run PSPICE and get the plots of the magnitude and phase of the output voltage, using an AC source of value 1. Is the PSPICE output phase identical to the required phase shift specified in the statement of the problem? Is the PSPICE output gain identical to the required gain specified in the statement of the problem? Discuss differences.

HINTS:

* You need to specify a value for RL to run the simulation.

Solution to Homework 6 (posted Friday 02-23, 4:45 PM)

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Homework 7

Assigned on Friday 02/23, due Friday 03/02 in class. You do not need to know detailed filter designs in chapter 16 in order to do the problems below.

1. Problem P 14.9-19

2. Problem P 13.4-17

3. Problem P 13.4-18, modified as follows:

a. Do the design as specified in the problem statement.

b. Find the attenuation as specified in the problem statement.

c. Run PSPICE (AC analysis, with input AC magnitude of 1 and phase of 0) and get the magnitude and phase plots for the output voltage. Does the PSPICE magnitude plot meet the specified filter requirements (break frequency and low-frequency gain)? Discuss differences.

4. Problem P 13.5-7

5. Problem DP 13-7

6. Problem P 16.4-3, modified as follows:

a. Do the design as specified in the problem statement.

b. Run PSPICE (AC analysis, with input AC magnitude of 1 and phase of 0) and get the magnitude and phase plots for the output voltage. Does the PSPICE magnitude plot meet the specified filter requirements (center frequency and Q)? Discuss differences.

HINTS:

* The notations used in this problem for Q and w0 do not have the same meaning as those used for bandpass filters discussed in chapter 13. The notations used in this problem denote the coefficients of the powers of s in the denominator of H(s) as in equation 16-4.1. For the banpass case, the maximum gain occurs at w0 but for the low-pass case, the maximum gain is usually at very low frequencies (not at the corner frequency). To find the corner frequency for the low-pass case, use the 3-dB procedure we discussed in class. Due to the notation problem in the text, grading for this problem will be lenient.

7. Problem P 16.4-14

HINTS:

* Select w0= 1/(RC).

NOTES on solutions from the textbook:

* Problem P13.4-17: the semilog plot is sloppy with the frequency axis since the markings of 2, 5, 10, etc. do not fit a log scale. It is better to use a semilog graph paper to do these plots.

* Problem P 13.5-7: see handwritten solution. The text solution only provides the resonant frequency, not bandwidth and Q.

* Problem P 16.4-3: the text solution assumes confusing notation (see hints above) and matches coefficients with equation 16.4-1. This is not a standard procedure. The correct procedure was discussed in class and involves more complicated calculations.

* Problem P 16.4-14: see hint above for frequency. Same problem with notation.

Solution to Homework 7 (posted Friday 03-02, 3:30 PM)

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Homework 8

This homework is not due or graded. It is assigned to help students work practice problems for the final exam.

1. Problem P10.11-13

2. Problem DP10-5

3. Problem P11.3-6

4. Problem P13.3-6

5. Problem P13.4-19

6. Problem P14.4-3

7. Problem P14.5-5

8. Problem P14.9-4

9. Problem P14.9-10

10. Problem P14.9-15

11. Problem P16.4-11

Solution to Homework 8 (posted Friday 03-02)

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Homework scores

Check your homework scores and let the grader know (csugg@u.washington.edu) if there are errors. Please do so by Friday March 5. The scores are in the Excel file at: http://students.washington.edu/~csugg/EE332HW.xls . Scores are listed by WebID (see your midterm exam for your WebID).

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 Last Updated:
03/01/2001

Contact the instructor at: soma@ee.washington.edu