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

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

Definition: An inverting amplifier is a circuit, which increases a voltage while inverting its polarity. See the example in the figure below: The input voltage is only 1 V, while the output voltage is 10 V. The input voltage is positive, while the output is negative. Operational Amplifiers Inverting Amplifiers – Part 1 - Equations +1 V -10 V 2

-1 V +10 V 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. Operational Amplifiers Inverting Amplifiers – Part 1 - Equations +1 V -10 V Input positive, output negative Input negative, output positive 3

Operational Amplifiers Inverting Amplifiers – Part 1 - Equations 4

Operational Amplifiers R2 is on the top, therefore „The higher..., the higher...“ R1 is on the bottom, therefore „The higher..., the lower...“ 5

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. There is no voltage, no signal in this node. Operational Amplifiers Inverting Amplifiers – Part 1 - Equations V+ V- Virtual ground 6

Operational Amplifiers Inverting Amplifiers – Part 1 - Equations V+ V- Rin 10k 7

Task 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 Rin Operational Amplifiers Inverting Amplifiers – Part 1 - Equations V+ V- 22k 100k V1 = -1.3 V 8 V2 = ?

Operational Amplifiers Inverting Amplifiers – Part 1 - Equations 22k 100k V1 = -1.3 V 9 V2 = V

Operational Amplifiers Inverting Amplifiers – Part 1 - Equations 22k 100k V1 = -1.3 V 10 Rin = 22k V2 = V

Operational Amplifiers Inverting Amplifiers – Part 1 - Equations References  