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| university:courses:electronics:electronics-lab-opamp-comparator [26 Oct 2018 12:40] – [Further Reading] add Fritzing files Antoniu Miclaus | university:courses:electronics:electronics-lab-opamp-comparator [05 Mar 2019 10:52] – [Further Reading] Antoniu Miclaus |
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| ===== Hysteresis Comparator ===== | ===== Hysteresis Comparator ===== |
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| Hysteresis is considered to be a phenomenon according to which the actual value of a quantity (material) depends on a previous values of quantities determining it. It is aproperty of a system such that an output value is not a strict function of the corresponding input, but also incorporates some lag, delay, or history dependence, and in particular the response for a decrease in the input variable is different from the response for an increase in the input variable. | Hysteresis is the dependence of a system's current state on previous values of quantities determining it. The output value is not a strict function of the corresponding input, but also incorporates some lag, delay, or history dependence. In particular, the response for a decrease in the input variable is different from the response for an increase in the input variable. |
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| In this configuration, there are two threshold values V<sub>ThH</sub> and V<sub>ThL</sub> with two output values V<sub>OH</sub> and V<sub>OL</sub>. The threshold values should depend on the output value which is fed back to the input and contributes to the threshold values (positive feedback). Via a resistive divider, a fraction of the output voltage is fed back to the non-inverting input. | In this configuration, there are two threshold values V<sub>ThH</sub> and V<sub>ThL</sub> with two output values V<sub>OH</sub> and V<sub>OL</sub>. The threshold values should depend on the output value which is fed back to the input and contributes to the threshold values (positive feedback). Via a resistive divider, a fraction of the output voltage is fed back to the non-inverting input. |
| 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]] |
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| ==== 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> |
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| | ==== Further Reading ==== |
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| Some additional resources on Op Amps as Comparators: | Some additional resources on Op Amps as Comparators: |
