Operational amplifier virtual earth circuit

Published:2011/8/24 2:29:00 Author:Jessie | Keyword: Operational amplifier, virtual earth | From:SeekIC

The op-amp of single-voltage's work requires to provide a virtualfor external, of whichvoltageisnormally VCC/2. In graph 2, thecircuit can be used to produce the VCC/2 voltage, butit will reduce the system frequency characteristics. R1 and R2are equivalent, which is choosen through the consumption and noise, and capacitorC1 is a low-pass filter, which is used to reduce the noise coming from power. In some applications,buffer op-amp can be ignored.



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