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university:courses:electronics:electronics-lab-opamp-comparator [05 Feb 2019 15:39] – [Hysteresis Comparator] grammatical simplification on difinition of hysteresis Timothy Kennedyuniversity:courses:electronics:electronics-lab-opamp-comparator [15 Jul 2019 16:51] – [Extra Activities] Pop Andreea
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 The high intrinsic gain of the op-amp and the output saturation effects can be exploited by configuring the op-amp as a comparator as in figure 1. This is essentially a binary-state decision-making circuit: if the voltage at the “+” terminal is greater than the voltage at the “-” terminal, Vin > Vref , the output goes “high” (saturates at its maximum value). Conversely if Vin < Vref the output goes “low”. The circuit compares the voltages at the two inputs and generates an output based on the relative values. Unlike all the previous circuits there is no feedback between the input and output; we say that the circuit is operating “open-loop”. The high intrinsic gain of the op-amp and the output saturation effects can be exploited by configuring the op-amp as a comparator as in figure 1. This is essentially a binary-state decision-making circuit: if the voltage at the “+” terminal is greater than the voltage at the “-” terminal, Vin > Vref , the output goes “high” (saturates at its maximum value). Conversely if Vin < Vref the output goes “low”. The circuit compares the voltages at the two inputs and generates an output based on the relative values. Unlike all the previous circuits there is no feedback between the input and output; we say that the circuit is operating “open-loop”.
  
-<WRAP centeralign>{{:university:courses:electronics:comp_amp-sch.png?500|}}</WRAP>+<WRAP centeralign>{{ :university:courses:electronics:simple_comp.png?400 |}}</WRAP> 
  
 <WRAP centeralign> Figure 1 Op-Amp as Comparator </WRAP> <WRAP centeralign> Figure 1 Op-Amp as Comparator </WRAP>
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 Consider the circuit presented in Figure 4. Consider the circuit presented in Figure 4.
  
-<WRAP centeralign>{{:university:courses:electronics:non_inv_hys_comp-sch.png?500|}}</WRAP>+<WRAP centeralign>{{ :university:courses:electronics:noninv_hys_comp.png?400 |}}</WRAP>
  
 <WRAP centeralign> Figure 4 Non-Inverting hysteresis comparator </WRAP> <WRAP centeralign> Figure 4 Non-Inverting hysteresis comparator </WRAP>
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 Consider the circuit presented in Figure 8. Consider the circuit presented in Figure 8.
  
-<WRAP centeralign>{{:university:courses:electronics:inv_hys_comp-sch.png?500|}}</WRAP>+<WRAP centeralign>{{ :university:courses:electronics:inv_hys_comp.png?400 |}}</WRAP>
  
 <WRAP centeralign> Figure 8. Inverting hysteresis comparator </WRAP> <WRAP centeralign> Figure 8. Inverting hysteresis comparator </WRAP>
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 Consider the circuit presented in Figure 12. Consider the circuit presented in Figure 12.
  
-<WRAP centeralign>{{:university:courses:electronics:inv_hys_comp_asyth-sch.png?500|}}</WRAP>+<WRAP centeralign>{{ :university:courses:electronics:inv_hys_comp_asy_th.png?400 |}}</WRAP>
  
 <WRAP centeralign> Figure 12. Inverting hysteresis comparator with asymmetric thresholds </WRAP> <WRAP centeralign> Figure 12. Inverting hysteresis comparator with asymmetric thresholds </WRAP>
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 You can also extend the above example to a circuit with multiple voltage levels as the circuit presented in Figure 16.  You can also extend the above example to a circuit with multiple voltage levels as the circuit presented in Figure 16. 
  
-<WRAP centeralign>{{:university:courses:electronics:optic_indicator_vlevel-sch.png?500|}}</WRAP>+<WRAP centeralign>{{ :university:courses:electronics:voltagelevelindicatorusingled.png?600 |}}</WRAP>
  
 <WRAP centeralign> Figure 16. Voltage Level Indicator using LEDs </WRAP> <WRAP centeralign> Figure 16. Voltage Level Indicator using LEDs </WRAP>
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 This type of circuit is also known as Window Comparator. An an application on this subject can be found in the activity: [[university:courses:electronics:electronics-lab-window-comp-tmp01|Temperature Control using Window Comparator]] This type of circuit is also known as Window Comparator. An an application on this subject can be found in the activity: [[university:courses:electronics:electronics-lab-window-comp-tmp01|Temperature Control using Window Comparator]]
  
-==== Further Reading ==== +<WRAP round download>
 ** Lab Resources:** ** Lab Resources:**
   * LTSpice files: [[ https://minhaskamal.github.io/DownGit/#/home?url=https://github.com/analogdevicesinc/education_tools/tree/master/m2k/ltspice/opamp_comp_ltspice | opamp_comp_ltspice]]   * LTSpice files: [[ https://minhaskamal.github.io/DownGit/#/home?url=https://github.com/analogdevicesinc/education_tools/tree/master/m2k/ltspice/opamp_comp_ltspice | opamp_comp_ltspice]]
   * Fritzing files: [[ https://minhaskamal.github.io/DownGit/#/home?url=https://github.com/analogdevicesinc/education_tools/tree/master/m2k/fritzing/opamp_comp_bb | opamp_comp_bb]]   * Fritzing files: [[ https://minhaskamal.github.io/DownGit/#/home?url=https://github.com/analogdevicesinc/education_tools/tree/master/m2k/fritzing/opamp_comp_bb | opamp_comp_bb]]
 +</WRAP>
  
 +==== Further Reading ====
  
 Some additional resources on Op Amps as Comparators: Some additional resources on Op Amps as Comparators:
university/courses/electronics/electronics-lab-opamp-comparator.txt · Last modified: 16 May 2022 15:22 by Doug Mercer

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