Operational Amplifier Basic Circuit

Published:2011/7/26 7:27:00 Author:Robert | Keyword: Operational, Amplifier, Basic | From:SeekIC

The positive power pin is connected to VCC+ and the ground or VCC- pin is connected to the GND. By taking a half of the positive voltage as virtual ground to connect to the operational amplifier's input pin, then the output voltage would be this virtual ground's voltage. And the operational amplifier's output voltage would take the virtual ground as center between the swing of Vom. There are some new operational amplifiers having two different maximum output voltage and minimum output voltage. This operational amplifier's data sheet would specifically point the Voh and Vol separately. It should be noted that many designers would use the virtual ground arbitrarily as reference for the input voltage and output voltage. But in most applications, the input and output use the power supply ground as reference. So the designers must add a DC-isolated capacitor in the input part and output part to isolate the DC voltage between the virtual ground and ground.



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