Date Assigned: Wednesday, November 2, 2011 Date Due: Wednesday, November 9, 2011
Reading:
In the Ulaby/Maharbiz text, please study the following sections.
Review the voltage-current relations for capacitors in Section 5-2
(equation 5.23)
and inductors in Section 5-3 (equation 5.55).
(We will study Chapters 5 and 6 in detail next semester in ELEC 226.)
Study Chapter 7, Sections 7-1 through 7-5.
Review complex number computations with your calculator.
The materials on
Moodle
for circuit analysis
with TI-83/84 and TI-89 calculators contain step-by-step instructions.
(These are the first two items under Course Materials on
Moodle.)
We will have Lab 5 on Thursday, Nov. 3, and your reports for
Lab 4 are due in lab on Nov. 3.
Exam 2 will be on Friday, Nov. 11.
The exam will include all material covered in the course, with emphasis
on the topics covered after Exam 1.
Exam 2 will not include material from Chapter 7 (sinusoids, phasors, etc.).
Please answer the following questions related to the
DAC circuits in Figures 4-22 and 4-23 of the text,
and submit solutions in class on Wednesday, Nov. 9.
The objective is to justify the statements on p. 155 of the textbook,
in the paragraph labeled "Example 4-8: R-2R Ladder," regarding the
input resistance seen by each dc source.
Input resistance is the ratio of dc source voltage to the dc current
supplied by the source.
For the DAC in Figure 4-22, find the input resistance seen by each source
V1,
V2,
V3,
V4 when it is connected to a "1" bit.
Does the input resistance of each
Vn depend on the value of the other bits?
Answer the same question for the DAC in Figure 4-23.
In this circuit, the input resistance of each
Vndoes depend on the value of the other bits.
When each source
V1,
V2,
V3,
V4 is connected to a "1" bit,
determine the maximum and minimum value of the input resistance seen by
that source.
(Consider which values for the other bits will produce the maximum
and minimum input resistance.)
[Hint: Analyze the circuit using the node-voltage method.]
Explain the advantages of the DAC in Figure 4-23 compared with the
DAC in Figure 4-22 for practical implementation with many bits (e.g.,
20 bits).
Please solve the following problems in Chapter 7
and submit solutions in class on Wednesday, Nov. 9.
Problems 1, 5, and 6 (sinusoidal signals).
Problems 10, 11, 12, and 14 (use your calculator to perform
complex number operations).