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university:courses:electronics:comms-lab-pulse-osc [24 Jul 2017 16:29] – change amplitude value to peak-peak Antoniu Miclausuniversity:courses:electronics:comms-lab-pulse-osc [23 Aug 2019 15:16] – Antoniu Miclaus
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 =====Hardware Setup:===== =====Hardware Setup:=====
  
-Setup AWG1 as a square wave with 1.4V amplitude and zero offset. Set the frequency to 50 KHz and the duty cycle to 70% ( square wave high for 70% of the period ). Set both scope inputs to 500 mV/div and the time base to 1 uSec/div. Set the trigger on the falling edge of channel 1.+Setup AWG1 as a square wave with 1.4V amplitude peak-to-peak and zero offset. Set the frequency to 50 KHz and the duty cycle to 50% ( square wave high for 50% of the period ). Set both scope inputs to 500 mV/div and the time base to 2 uSec/div. Set the trigger on the falling edge of channel 1. 
 + 
 +{{ :university:courses:electronics:apulse_bb.png? |}} 
 + 
 +<WRAP centeralign> Figure 3 Pulsed oscillator circuit breadboard connections </WRAP>
  
 =====Procedure:===== =====Procedure:=====
  
 Turn on the +5V power supply and start the AWG. Observe the output waveform. It should consist of a burst of a few cycles of sinewave starting at the falling edge of the AWG 1 square wave and ending on the rising edge.   Turn on the +5V power supply and start the AWG. Observe the output waveform. It should consist of a burst of a few cycles of sinewave starting at the falling edge of the AWG 1 square wave and ending on the rising edge.  
 +{{ :university:courses:electronics:apulse_scopyshot.png? |}}
 +
 +<WRAP centeralign> Figure 4 Pulsed oscillator circuit Scopy shot</WRAP>
 +
  
 Notice that the output sine wave swings positive and negative around ground (0 V). Measure the frequency of the output sinewave. Measure the peak to peak amplitude of the first and last cycle of the output sinewave burst. How much has the amplitude fallen off from the start to the end of the burst? Notice that the output sine wave swings positive and negative around ground (0 V). Measure the frequency of the output sinewave. Measure the peak to peak amplitude of the first and last cycle of the output sinewave burst. How much has the amplitude fallen off from the start to the end of the burst?
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 How does the measured output sinewave frequency compare to what you calculate using the formula for an LC tank and the values for L and C you used? Does the amount of dampening of the output amplitude make sense based on the internal DC resistance of the inductor you used? If not what other factors might contribute to the dampening? How does the measured output sinewave frequency compare to what you calculate using the formula for an LC tank and the values for L and C you used? Does the amount of dampening of the output amplitude make sense based on the internal DC resistance of the inductor you used? If not what other factors might contribute to the dampening?
 +
 +<WRAP round download>
 +**Resources:**
 +  * Fritzing files: [[ https://minhaskamal.github.io/DownGit/#/home?url=https://github.com/analogdevicesinc/education_tools/tree/master/m2k/fritzing/pulsed_oscillator_bb | pulsed_oscillator_bb]]
 +</WRAP>
  
 **For Further Reading:** **For Further Reading:**
university/courses/electronics/comms-lab-pulse-osc.txt · Last modified: 25 Jun 2020 22:07 by 127.0.0.1

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