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university:labs:comms_lab_isr_adalm2000 [18 May 2020 17:41] – ↷ Page moved and renamed from university:labs:m2k:comms_lab_isr to university:labs:comms_lab_isr_adalm2000 Cristina Suteuuniversity:labs:comms_lab_isr_adalm2000 [18 May 2020 17:50] – media files from current location Cristina Suteu
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 The inductors supplied in your parts kit, like all non-ideal electrical components, are not perfect. The schematic in figure 1 shows the most common simple model of a real inductor. In addition to the desired inductance L, the real component also has loss ( modeled as a series resistance, shown in the schematic as R ) and a parallel parasitic capacitance, shown as C. The smaller the resistance i.e. close to 0 Ω and the smaller the capacitance i.e. close to 0 F, the more ideal the inductor becomes. The inductors supplied in your parts kit, like all non-ideal electrical components, are not perfect. The schematic in figure 1 shows the most common simple model of a real inductor. In addition to the desired inductance L, the real component also has loss ( modeled as a series resistance, shown in the schematic as R ) and a parallel parasitic capacitance, shown as C. The smaller the resistance i.e. close to 0 Ω and the smaller the capacitance i.e. close to 0 F, the more ideal the inductor becomes.
  
-{{ :university:courses:electronics:aisr_f1.png?400 |}}+{{ :university:labs:aisr_f1.png?400 |}}
  
 <WRAP centeralign> Figure 1, Three Element LRC Inductor Model </WRAP> <WRAP centeralign> Figure 1, Three Element LRC Inductor Model </WRAP>
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 The schematic in figure 2 shows the simulation test circuit for the three element LRC model of the inductor. L, R and C<sub>P</sub> are used to model the inductor. V1 is the ideal AC test voltage source and resistor RS serves as the source resistance for V1. CL and RL are the components of the load with CL set equal to the typical input capacitance of the ADALM2000 scope input channel. RL is either set equal to RS or can be set to some higher value such as the 1 MegΩ input resistance of the scope channel. The schematic in figure 2 shows the simulation test circuit for the three element LRC model of the inductor. L, R and C<sub>P</sub> are used to model the inductor. V1 is the ideal AC test voltage source and resistor RS serves as the source resistance for V1. CL and RL are the components of the load with CL set equal to the typical input capacitance of the ADALM2000 scope input channel. RL is either set equal to RS or can be set to some higher value such as the 1 MegΩ input resistance of the scope channel.
  
-{{ :university:courses:electronics:aisr_f2.png?450 |}}+{{ :university:labs:aisr_f2.png?450 |}}
  
 <WRAP centeralign> Figure 2 Simulation Schematic </WRAP> <WRAP centeralign> Figure 2 Simulation Schematic </WRAP>
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 Two frequency sweep simulations were run from 10KHz to 10MHz as an example of a 1mH inductor, L, with C<sub>P</sub> set to 15pF and R set to 100mΩ. The red curve is with RL set to the same 200Ω as RS. The amplitude seen at RL has a sharp dip at the self resonance frequency when the impedance of the inductor is at its maximum. The blue curve is with RL set to the 1 MegΩ of the scope input. Again we see the sharp null when the impedance is maximum. We also see a sharp peak in the amplitude seen at RL about one octave below the notch. This peaking occurs when the source and load resistances are not matched. Two frequency sweep simulations were run from 10KHz to 10MHz as an example of a 1mH inductor, L, with C<sub>P</sub> set to 15pF and R set to 100mΩ. The red curve is with RL set to the same 200Ω as RS. The amplitude seen at RL has a sharp dip at the self resonance frequency when the impedance of the inductor is at its maximum. The blue curve is with RL set to the 1 MegΩ of the scope input. Again we see the sharp null when the impedance is maximum. We also see a sharp peak in the amplitude seen at RL about one octave below the notch. This peaking occurs when the source and load resistances are not matched.
  
-{{ :university:courses:electronics:aisr_f3.png?500 |}}+{{ :university:labs:aisr_f3.png?500 |}}
  
 <WRAP centeralign> Figure 3, Simulation results Red curve RL=200Ω, Blue Curve RL=1MegΩ </WRAP> <WRAP centeralign> Figure 3, Simulation results Red curve RL=200Ω, Blue Curve RL=1MegΩ </WRAP>
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 Build the Inductor test circuit as shown in figure 4 on your solder-less breadboard. The green squares indicate where to connect the ADALM2000 AWG and scope channels. Build the Inductor test circuit as shown in figure 4 on your solder-less breadboard. The green squares indicate where to connect the ADALM2000 AWG and scope channels.
  
-{{ :university:courses:electronics:aisr_f4.png?500 |}}+{{ :university:labs:aisr_f4.png?500 |}}
  
 <WRAP centeralign> Figure 4, Inductor test circuit </WRAP> <WRAP centeralign> Figure 4, Inductor test circuit </WRAP>
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 The connections to the ADALM2000 AWG output and scope channel inputs are as indicated by the green boxes in figure 4. Your parts kit should contain a number of inductors with different values. Insert each inductor, one at a time into your test circuit. The connections to the ADALM2000 AWG output and scope channel inputs are as indicated by the green boxes in figure 4. Your parts kit should contain a number of inductors with different values. Insert each inductor, one at a time into your test circuit.
-{{ :university:courses:electronics:aisr_f4bb.png? |}}+{{ :university:labs:aisr_f4bb.png? |}}
  
 <WRAP centeralign> Figure 5 Inductor test circuit breadboard connections </WRAP> <WRAP centeralign> Figure 5 Inductor test circuit breadboard connections </WRAP>
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 Run a single sweep for each inductor in your kit of parts. You should see amplitude and phase vs frequency plots that look very similar to your simulation results. Be sure to export the data to a .csv file for further analysis in either Excel or Matlab. Run a single sweep for each inductor in your kit of parts. You should see amplitude and phase vs frequency plots that look very similar to your simulation results. Be sure to export the data to a .csv file for further analysis in either Excel or Matlab.
-{{ :university:courses:electronics:aisr_f6.png? |}}+{{ :university:labs:aisr_f6.png? |}}
  
 <WRAP centeralign> Figure 6 Scopy Shot, L=100uH, RL=200ohms</WRAP> <WRAP centeralign> Figure 6 Scopy Shot, L=100uH, RL=200ohms</WRAP>
-{{ :university:courses:electronics:aisr_f7.png? |}}+{{ :university:labs:aisr_f7.png? |}}
  
 <WRAP centeralign> Figure 7 Scopy Shot, L=100uH, RL=1Mohms</WRAP> <WRAP centeralign> Figure 7 Scopy Shot, L=100uH, RL=1Mohms</WRAP>
university/labs/comms_lab_isr_adalm2000.txt · Last modified: 25 Jun 2020 21:16 by Robin Getz

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