Javalab [Javalab] Lars Drud Nielsen
ldn@oersted.dtu.dk

Voltage follower

This is the simplest conceivable example of a negative-feedback opamp circuit. In the (normal) case of a large open-loop gain of the opamp (typically >100 dB) the very direct feedback connection will force the voltage difference between the input terminals to be virtually zero. In this limit the closed-loop amplification factor of the circuit will thus equal unity.

Turn on the voltage source and check the circuit for different values of the open-loop gain:  >100 dB (very large gain),  20 dB (A = 10),  6 dB (A = approx. 2),  0 dB (A = 1).

Also try in some of the cases to provoke a saturation of the opamp by application of an excessive (positive or negative) input voltage.

• How to use Javalab
• About Javalab opamps
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