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AS Level     Op Amp     Delta Lux     Gain     Schmitt Astable     Schmitt Trigger     >Virtual Earth<     Voltage Follower    

Op Amp Virtual Earth


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Virtual Earth

Explanation: Operational amplifiers have a very large open loop gain. So if the output is a few volts, the inverting input voltage must be very small (a few microvolts). This voltage is so small, it is called a virtual earth.

The inverting input, labelled "VE" on the simulation below, is a Virtual Earth because the voltage here is approximately zero as long as the amplifier is not saturating or limiting.

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