Discuss the factors that must be considered when selecting op amps for an interface between a sensor and a data converter.
Interface and Design
Directions: Please answer BOTH of the questions and respond to a minimum of two of your classmates.
Question A
Discuss the factors that must be considered when selecting op amps for an interface between a sensor and a data converter.
Question B
Discuss the process of acquiring the necessary information for op amp designs.
Interfacing a Transducer to an Analog-to-Digital Converter and Interfacing Digital-to-Analog Converters to Loads
Watch video Week 5 – Op Amp DAC Circuit (Right click, save as)
Design an 8-Bit DAC Circuit – Calculate the values for all resistors
Include calculations and schematic in a Word document entitled: “HW5_StudentID”, with your student id substituted in the file name. Show all work for full credit.
Upload file “HW5_StudentID”
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.
Watch the video Week 5 – Op Amp DAC Circuit
Determine the values of all the remaining seven resistors and fill in the table 1.
Table1:
Resistors Values
R1 1k Ω
R2
R3
R4
R5
R6
R7
R8
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
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
Take the screenshots of Vout measurements for the input/output combination for each of the above 8-bits.
Answer the following questions:
Determine the approximate value of RF which results in accurate digital to analog conversion.
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.
Starting from the least significant bit to the most significant bit, what is the effect of feedback resistance on the output voltage?
From your measurements, does increase in the digital value result in increase in analog value? Please explain.
Is the voltage gain of the op Amp different for each bit? Please explain why?
Create a new word document called “Lab5_StudentID.docx” with your GID substituted into the file name.
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.
Upload file “Lab5_StudentID” in Blackboard.
Week 6
Directions: Please answer BOTH of the questions and respond to a minimum of two of your classmates.
Question A
Discuss the concept of phase shift in oscillators and how it is controlled in oscillator circuits.
Question B
Discuss the Wien Bridge Oscillator circuit and why it is suited for audio applications
Oscillator Circuits
Read Chapter 11 section 3 in the text.
Read Op Amp Oscillator Circuits.pdf
Answer the following questions:
List the general requirements for oscillation
How does an RC combination affect the phase plot of an oscillator
For a Wien-bridge oscillator
Given R = 20Kohm and C = 10nF what is the frequency of oscillation?
Given a required frequency of oscillation of f = 3kHz and R = 5kohm, what should the value of C be?
Save all work in a Word document with the title: “HW6_StudentID”, with your student id substituted in the file name. Show all work for full credit.
Upload file “HW6_StudentID”
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