Reference no: EM131408021
Interfacing a Transducer to an Analog-to-Digital Converter and Interfacing Digital-to-Analog Converters to Loads
The purpose of this lab is to allow students to gain experience constructing Digital to Analog Converters in Multisim. Students will extend the concepts learned in the module and homework to build an 8-Bit DAC. Several binary inputs and the associated analog output values measured with a virtual digital multimeter will be captured in screenshots.
1. Watch the video - Op Amp DAC Circuit
https://content.grantham.edu/at/EE332/Week_5_Op_Amp_DAC_Circuit.mp4
2. Determine the values of all the remaining seven resistors and fill in the table 1.
Table1:
Resistors
|
Values
|
R1
|
1k ?
|
R2
|
|
R3
|
|
R4
|
|
R5
|
|
R6
|
|
R7
|
|
R8
|
|
3. Recall the binary to decimal conversion and fill the table below:
Bits
|
Binary Input
|
Decimal conversion
|
MSB
(S1)
|
1000 0000
|
|
S2
|
|
|
S3
|
|
|
S4
|
|
|
S5
|
|
|
S6
|
|
|
S7
|
|
|
LSB
(S8)
|
0000 0001
|
|
4. Construct an 8-bit binary weighted DAC in Multisim and measure the output voltage Vout using the multimeter and record the computed gain below.
Table2:
Bits
|
Binary Input
|
Vin
|
Rn
(n = 1,2,3,4,5,6,7,8)
|
RF
|
Output Voltage (Vout)
|
Voltage Gain (Av)
|
MSB
(S1)
|
1000 0000
|
|
|
|
|
|
S2
|
|
|
|
|
|
|
S3
|
|
|
|
|
|
|
S4
|
|
|
|
|
|
|
S5
|
|
|
|
|
|
|
S6
|
|
|
|
|
|
|
S7
|
|
|
|
|
|
|
LSB
(S8)
|
0000 0001
|
|
|
|
|
|
5. Take the screenshots of Vout measurements for the input/output combination for each of the above 8-bits.
6. Answer the following questions:
a. Determine the approximate value of RF which results in accurate digital to analog conversion.
b. Write the expression for Vout in terms of Vin, RF and R for each bit. Also, express Vout in terms of all 8 input voltages.
c. Starting from the least significant bit to the most significant bit, what is the effect of feedback resistance on the output voltage?
d. From your measurements, does increase in the digital value result in increase in analog value? Please explain.
e. Is the voltage gain of the op Amp different for each bit? Please explain why?
7. Create a new word document called "Lab5_StudentID.docx" with your GID substituted into the file name.
8. Verify all calculations from analysis and measurements from simulations. Save the results along with the table and paste the screen captures in the word document. Make sure to answer the questions.
Create an apa-style list of references
: Using the online sources that your found for part 1, create an APA-style list of references and an MLA-style works-cited list from your collective online sources.
|
Benefits of higher education and academic integrity
: A discussion of the benefits of higher education and a reflection on academic integrity and why students should uphold university standa
|
Plot the monthly data on a sheet of graph paper
: Plot the monthly data on a sheet of graph paper. Compute the sales forecast for July using the following approaches: 1) a three-month moving average; 2) a weighted three month moving average using .50 for June, .30 for May, and .20 for April; ..
|
What effect would option 3 have on the financial statements
: Prepare the journal entries for Options 1 and 2, and comment on why these alternatives may not be attractive. Why do companies issue stock dividends?
|
What is the effect of feedback resistance on output voltage
: The purpose of this lab is to allow students to gain experience constructing Digital to Analog Converters in Multisim. Students will extend the concepts learned in the module and homework to build an 8-Bit DAC. Several binary inputs and the associ..
|
Replaced the cold war system
: Is globalization the dominant international system that has replaced the Cold War system? What are its unique characteristics?
|
Explain the three frequency distributions
: Below you see the SPSS-output from the Frequency-command. The first table shows univariate frequency distributions from each country. The three graphs are histograms for each country. We want you to explain the three frequency distributions and th..
|
Difference between a stock dividend and a stock split
: Compute the ratio of contributed capital to earned capital after independently considering each of the four actions listed above. Reduce contributed capital by the cost of the treasury stock. Comment on the difference between a stock dividend and ..
|
Type of control over the internet
: What would result from the old-style type of gatekeeper having that same type of control over the Internet?
|