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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 : Inverting Amplifiers – Part 1 - Equations 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: InvertingAmplifiers – Part 1 - Equations 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: An inverting amplifier is a circuit, which increases a voltage while inverting its polarity. Seetheexamplein the figurebelow: The input voltageisonly 1 V, whilethe output voltageis 10 V. The input voltageis positive, whilethe output is negative. +1 V -10 V Operational Amplifiers

  3. Description: The output polarity of an inverting amplifier is reversed as compared to its input. If the input voltage is positive, the output voltage is negative, and vice versa. Input negative, output positive Input positive, output negative +1 V -10 V -1 V +10 V Operational Amplifiers

  4. Voltage Gain • The equation for the voltage gain is • Theequationsays • the gain is negative because the amplifier is inverting • the higher the resistance R2, the higher the gain • the higher the resistance R1, the lower the gain Operational Amplifiers

  5. VoltageGain R2 is on the top, therefore „Thehigher ..., thehigher ...“ R1 is on thebottom, therefore „Thehigher ..., thelower...“ OperationalAmplifiers

  6. Virtual Ground We call the node between R1, R2, and V- „Virtual ground“. It keeps its ground potential without being directly connected to the ground. The negative feedback ensures that the voltage difference between the inputs V+ and V- is zero. Thereis no voltage, no signal in this node. Virtualground V- V+ Operational Amplifiers

  7. Input Resistance The input resistanceRinofaninvertingamplifierisequal to theresistanceof R1: Example If R1 is 10k, the input resistanceRinoftheamplifieris 10k. V- Rin 10k V+ Operational Amplifiers

  8. Task • See the figurebelow. • Given the values of R1, R2, and V1, determine • the polarity and the value of the output voltage V2 • the input resistance Rin 100k V- 22k V1 = -1.3 V V2 = ? V+ Operational Amplifiers

  9. Solution The output voltage V2 is positive and is equal to +5.91 V. 100k 22k V1 = -1.3 V V2 = +5.91 V Operational Amplifiers

  10. Solution The input resistance Rin is equal to 22 kΩ. 100k Rin = 22k 22k V1 = -1.3 V V2 = +5.91 V Operational Amplifiers

  11. References • http://www.wikipedia.com • http://www.thefreedictionary.com Operational Amplifiers

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