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LAB REPORT 2 - Wichita State University
Typology: Lab Reports
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Wichita State Universiy January 24th, 2023 T.A. Sai Naveen Alaparthi Nguyen Huu T. Ton ECE-586L Z368Q LAB 2 INTRODUCTION TO DATEx ADD-IN MODULE 2.1 - The Master Signals, Speech and Amplifier modules The Master Signals module 2kHz Sine Waveform 100kHz Cosine Waveform
100kHz Sine Waveform Table 1 Output voltage Frequency 2kHz SINE 3.571 Vp-p 2.083kHz 100kHz COSINE 4.075 Vp-p 100.001kHz 100KHz SINE 3.655 Vp-p 100.008kHz Observation: The Sine and Cosine signals are 90 degrees out of phase.
The Amplifier Module Input voltage Output voltage 3.529 Vp-p 1.912 Vp-p Question 2: Calculate the Amplifier module’s gain (on its present gain setting) Because the gain control is set to the third of the input, the gain is about 0.33. Av = 𝑉𝑜𝑢𝑡 𝑉𝑖𝑛
Input voltage Output voltage 3.571 Vp-p 352.45 mVp-p
Question 3: Calculate the Amplifier module’s new gain. Av = 352 .45m
Question 4: In terms of the gain figure, what’s the difference between gain and attenuation? Attenuation has a value less than one Av, whereas Gain has a value larger than one Av. Question 5: What do you think the output signal would look like if the amplifier’s gain was sufficiently large? Because the output signal is significantly bigger than the DC power supply due to a suitably strong gain, the output signal will be clipped at the peaks. Question 6: Why is the Master Signals module’s 100kHz SINE output inaudible? Because the headphone's bandwidth is 20Hz to 20kHz, the 100kHz sine output is inaudible. 2.2 - The Adder and Phase Shifter modules The Adder module Question 1: What aspect of the Adder module’s performance does the G control vary? The amplitude of the output signal is controlled by Module G. Table 1 Input voltage Output voltage Gain Input A Maximum 3.487 V 679.94 mV 0. Minimum 7.079 V 2.
Table 3 Adder’s output voltage 13.741 V Question 4: What is the relationship between the amplitude of the signals on the Adder module’s inputs and output? Output = G x input A + g x input B The Phase Shift module Question 5: The output signal of this module can be phase shifted by varied amounts, but it always lags behind the input signal. 2.3 The Voltage Controlled Oscillator (VCO) Frequency 5kHz Table 1 Frequency Frequency of function generator’s output 5.322kHz Question 1: What happens to the function generator’s output when you increase its positive DC input voltage? The output frequency increases when I increase its positive DC input voltage. Table 2 Frequency Frequency of function generator’s output 14.626kHz
Question 2: Use the information in Tables 1 and 2 to determine the function generator’s VCO sensitivity (that is, how much its output frequency changes per volt). Sensitivity = delta frequency delta DC input
( 14630 − 5322 ) 10 = 931 Hz/ V Frequency 500 Hz Sensitivity = delta frequency delta DC input
( 1466 − 533 ) 10 = 93.3 Hz/ V Frequency 50kHz
