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

Bridge amplifier

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 amplification factor of the circuit will be determined solely by the resistance values.

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

Notice that for special (balanced) choices of resistance values the resulting circuit amplification will be zero.

For other (extreme) choices of resistance values the circuit will degenerate into standard opamp circuits such as the inverting amplifier or the voltage follower.

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