OP-Amp as Non-Inverting Amplifier

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OP Amp as Non-Inverting Amplifier

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Here the output signal is fed back to the inverting input by a voltage divider. The output signal is divided by the voltage divider, which results in an output signal being amplified. The resistance ratio determines the gain factor.

Non-Inverting Operational Amplifier - Non-Inverting Op Amp

Since the input resistance of an operational amplifier is very high, the input currents are negligible. Thus: I1 = I2  (1)

Since the differential voltage at the inputs of the operational amplifier is zero, the following applies: VR1 = VIN      (2)

Apply the mesh rule and you get for the output voltage VOUT:

VOUT = VR1 + VR2   or    VOUT = VIN + VR2

With I1 = I2 and Ohm's law you get:

Exercise - OP-Amp as Non-Inverting Amplifier

Op-Amp as Non-Inverting Comparator - exercise

Exercise 1:

Calculate the output voltage with the following values: R1 = 2 kΩ, R2 = 22 kΩ, VIN = - 500 mV

Exercise 2:

R1 = 2 kΩ,   R2 = 22 kΩ,  Ue = 1 V

1. What voltage is measured between the inverting and the non-inverting input in the steady state ?
2. Calculate the current flowing through R2 ?
3. What is the voltage drop across R2?