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

Negative resistance

The opamp circuit is considered as a two-terminal load, as seen from the voltage source. (The opamp output voltage is of no interest!) The equivalent load resistance, i.e. the ratio between the applied voltage and the current supplied by the voltage source, will - with usual conventions - have a negative sign!

In the (normal) case of a large open-loop gain of the opamp (typically >100 dB) the feedback mechanism will force the opamp input voltage difference to be virtually zero. In this limit the equivalent load resistance of the circuit will be determined solely by the resistance values.

Turn on the voltage source and check the circuit with different resistance values.

• How to use Javalab
• About Javalab opamps
[Opdatering af log]