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- Electronics
- Rectifier Diode – how it works
- Transistor – Basics
- Thyristor – how it works
- Electronic Load Relay ELR
- Operational Amplifier
- Comparator Using Op-Amp
- Inverting Op Amp
- OP-Amp as Impedance Converter
- OP-Amp as Non-Inverting Amplifier
- OP-Amp as Differential Amplifier
- OP-Amp as summer
- Op-amp Integrator
- Op-Amp as Differentiator
- Op-Amp as Schmitt-Trigger
- Voltage to Current Converter
- Transimpedance amplifier
- AD converter with Op Amp
- Exercises Op-Amp
- Zener-Diode
- Thermal conductance and resistance
Home ⇒ Overview Courses ⇒ Electronics ⇒ Operational amplifier ⇒ Impedance Converter
Operational Amplifier as Impedance Converter
Table of Contents
ToggleIn this circuit, the operational amplifier functions as an impedance converter due to its high input resistance and low output resistance. This allows a low impedance load to be connected to a signal source without putting too much load on the signal source.
Another name for this circuit is also voltage follower, because here the operational amplifier has an amplification factor of V = 1.

Operational Amplifier as Impedance Converter
To explain this, one must know how the operational amplifier works: The operational amplifier strives to ensure that both of its inputs always have the same potential. At this point one also speaks of a "virtual zero point". This condition is only fulfilled here if the output voltage is equal to the input voltage.
Exercises Op-Amp as Impedance Converter
In the following circuit, the measuring voltage of the measuring bridge is amplified by a differential amplifier.

Exercises Op-Amp as Impedance Converter
What problem does this circuit have? Give a possible solution!
Problem: Depending on the resistance values, the differential amplifier can place too much load on the measuring bridge and distort the measurement result.

Exercises Op-Amp as Impedance Converter 2
Possible solution: Op-Amp as impedance converter

Exercises Op-Amp as Impedance Converter solution