Tutorial: Mechanic – electrician Topic: Electronics II. class Operational Amplifiers: Non-Inverting Amplifiers – Part 1 - Equations Prepared by: Ing.

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Tutorial: Mechanic – electrician Topic: Electronics II. class Operational Amplifiers: Non-Inverting Amplifiers – Part 2 – Derivations Prepared by: Ing.

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Tutorial: Mechanic – electrician Topic: Electronics II. class Operational Amplifiers: Non-Inverting Amplifiers – Part 1 - Equations Prepared by: Ing. Jaroslav Bernkopf AVOP-ELEKTRO-Ber-004 Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/ je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.

A non-inverting amplifier is a circuit, which increases a voltage while maintaining its polarity. The output voltage changes in the same direction as the input voltage. See the example in the figure below: The input voltage is only 1 V, while the output voltage is 11 V. The input voltage is positive, and the output is positive, too. Non-Inverting Amplifiers – Part 1 - Equations Operational Amplifiers 2 +1 V +11 V V+ V-

-1 V -11 V V+ V- +1 V +11 V V+ V- The output polarity of a non-inverting amplifier is the same as the input polarity. If the input voltage is positive, the output voltage is positive, too. If the input voltage is negative, the output voltage is negative, too. Non-Inverting Amplifiers – Part 1 - Equations Operational Amplifiers 3 Input positive, output positive Input negative, output negative

Non-Inverting Amplifiers – Part 1 - Equations Operational Amplifiers 4 +1 V +11 V V+ V-

Non-Inverting Amplifiers – Part 1 - Equations Operational Amplifiers 5 R2 is on the top, therefore „The higher..., the higher...“ R1 is on the bottom, therefore „The higher..., the lower...“ The voltage gain is never lower than 1 +1 V +11 V V+ V-

+1 V +11 V V+ V- +1 V The negative feedback ensures that the non-inverting and inverting inputs of the operational amplifier match. The inputs seem to be shorted. The node between R1, R2, and V- keeps the same potential as the input V+. The signal at the inverting input is the same as that at the non-inverting input. The signal at the inverting input follows the signal at the non-inverting input. Non-Inverting Amplifiers – Part 1 - Equations Operational Amplifiers 6 Virtual short

+1 V +11 V V+ V- +1 V Non-Inverting Amplifiers – Part 1 - Equations Operational Amplifiers 7 Rin Ri = ∞ Virtual short

See the figure below. Given the values of R1, R2, and V1, determine the polarity and the value of the output voltage V2 the input resistance R in Non-Inverting Amplifiers – Part 1 - Equations Operational Amplifiers 8 V+ V- 22k 100k V2 = ? Rin = ? V1 = -1.3 V Ri = ∞ Virtual short

Non-Inverting Amplifiers – Part 1 - Equations Operational Amplifiers 9 V2 = V V+ V- 22k 100k Rin = ? V1 = -1.3 V Ri = ∞ Virtual short

Non-Inverting Amplifiers – Part 1 - Equations Operational Amplifiers 10 Rin = ∞ V2 = V V+ V- 22k 100k V1 = -1.3 V Ri = ∞ Virtual short

Non-Inverting Amplifiers – Part 1 - Equations Operational Amplifiers 11    