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Anglicky v odborných předmětech "Support of teaching technical subjects in English “

Anglicky v odborných předmětech "Support of teaching technical subjects in English “. Tutorial : Mechanic - electrician Topic : Electronics II. Class Operational Amplifiers : Comparators – Part 1 - Basics Prepared by: Ing. Jaroslav Bernkopf.

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Anglicky v odborných předmětech "Support of teaching technical subjects in English “

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  1. Anglicky v odborných předmětech"Support ofteachingtechnicalsubjects in English“ Tutorial: Mechanic - electrician Topic: Electronics II. Class OperationalAmplifiers: Comparators – Part 1 - Basics Prepared by: Ing. Jaroslav Bernkopf Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.

  2. Definition A comparator is a device that compares two voltages. Its output indicates which of the input voltages is larger. Vi+ Vout Vi- Operational Amplifiers

  3. Description Ifthevoltage on the non-inverting input (Vi+) ishigherthantheothervoltage (Vi-), the output voltageVoutis positive. And vice versa: IfVi+islowerthanVi-, the output voltageVoutisnegative. Vi+ Vout Vi- OperationalAmplifiers

  4. Description Vout Vout is positive, because Vi+ ishigherthanVi-. Vi- ishigherthanVi+ therefore Vout is negative. Vi- Vi+ OperationalAmplifiers

  5. Description Operationalamplifiers as comparators – disadvantages Operationalamplifiers are slow. Their output levels are not „logic“. OperationalAmplifiers

  6. Description Operationalamplifiers are slow. When a fast signal of a high frequency is applied to the inputs, an operational amplifier reacts too lazily. It needs a long time to wake up and then another long time to transit from one level to the other. Vout Vi+ Vi- OperationalAmplifiers

  7. Description Operationalamplifiers are slow. The output Voutshould start movinghere – whenVi+ becomeslowerthanVi-. But itstarts more than 0.5μs later – here. And stopsmovinganother 2.5 μs later – here. Vout Vi+ Vi- OperationalAmplifiers

  8. Description Output levelsofoperationalamplifiers are not „logic“. Thehighlevel output voltageshouldhave a „TTL“ value, i.e. +5 V maximum. Hereitisabout +13.5 V. Thelowleveloutput voltageshouldbenear to zero. Hereitis about-13.5 V. Vout Vi+ Vi- OperationalAmplifiers

  9. Task Completethe picturebelow.Supposetheextreme output voltages are ±13.5 V. Vi+ Vi- Vout= ??? Operational Amplifiers

  10. Solution Vi+ Vi- Vout Operational Amplifiers

  11. References • http://www.wikipedia.com • http://www.thefreedictionary.com • http://holbert.faculty.asu.edu/eee202/EEE202_Lect8_OperationalAmplifiers.ppt • http://www.wisc-online.com/Objects/ViewObject.aspx?ID=SSE2803 Operational Amplifiers

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