ECET 274 Postlab4
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Purdue University *
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27400
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Electrical Engineering
Date
Apr 3, 2024
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docx
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Uploaded by DukeWillpowerGerbil42
Xu Lu
ECET 274 Lab 4 Tuesday 3:30-5:20
02/27/2024
Executive Summary
The purpose of this lab was to understand the operation and limitations of frequent synthesis, and to become familiar with the operation of a voltage-controlled oscillator.
The prelab was first to read the entire lab, and then review the datasheets for MAX 2606 as the VCO and the MAX2471 as a VCO amplifier. Procedure I of the lab was to solder the entire local oscillator on the PCB. Procedure II of the lab was to check the circuit after assembly. Power the VCO with a 5.5V supply voltage. J7 jumper was set to allow control to the 10-k potentiometer. The potentiometer is turned to full CW to measure the initial amplitude and frequency. The potentiometer is turned CCW util 100% is reached. The following table records the frequency and amplitude when the potentiometer is full CW and the 8 full turns CCW.
Potentiometer Turns
Frequency (MHz)
Amplitude (dBm)
Full CW 0%
130.04
-6.04
8 turns CCW 25%
128.66
-5.72
8 turns CCW 50%
122.95
-4.62
8 turns CCW 75%
106.34
-4.03
Full CCW 100%
94.74
-4.82
Procedure III of the lab was to measure the VCO characteristics. The VCO is set to 108.7345MHz
as the actual value shown on the spectrum analyzer. The VCO amplitude is -3.88 dBm. My hand was placed one inch above the VCO chip, and then the output frequency dropped to 108.6966MHz. The difference is 39kHz. Connect the VCO output to the oscilloscope, the RMS voltage amplitude I measured was 254.9 Vrms. The potentiometer is incremented by 100mV from 94.74 MHz to 119.23 MHz The data was collected and then graphed. We can find out that the increase of voltage and frequency relationship is linear.
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