Operational Amplifier as Impedance Converter
In 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!
