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- Electronics
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- OP-Amp as Impedance Converter
- OP-Amp as Non-Inverting Amplifier
- OP-Amp as Differential Amplifier
- OP-Amp as summer
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Home ⇒ Overview Courses ⇒ Electronics ⇒ Operational amplifier ⇒ OP-Amp als Non-inverting Amplifier
OP Amp as Non-Inverting Amplifier
Table of Contents
ToggleHere 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
- What voltage is measured between the inverting and the non-inverting input in the steady state ?
- Calculate the current flowing through R2 ?
- What is the voltage drop across R2?
Solution exercise 1:
Vout = (1 + R1 / R2) VIN = (1 + 22 kΩ / 2 kΩ) (-) 0.5 V = - 6V
Solution exercise 2:
The difference between the two inputs of the Op-Amp is in the steady state: Udiff = 0V
Since the input current of the Op-Amp is negligibly small, the following applies: I1 = I2
I2 = I1 = VR1 / R1 = VIn / R1 = 1 V / 2 kΩ = 0.5 mA
VR2 = I2 * R2 = 0.5 mA * 22 kΩ = 11 V