Operational Amplifier Absorber Circuit

Published:2011/6/14 23:35:00 Author:Robert | Keyword: Operational Amplifier, Absorber | From:SeekIC

The operational amplifier is a device with high gain. By adding deep negative feedback when using, the operational amplifier can get good closed loop characteristic. But the negative feedback circuit always bring phaseshift for high-frequency signals. When this phaseshift get to 180。it would make the negative feedback to be positive feedback, so it would generate parasitic self-oscillation to make the opertaional amplifier unable to work normally. In the low frequency the self-oscillation is mostly generated by common power coupling. This case can be solved by strengthening the decoupling. In the high frequency the self-oscillation is solved by corresponding phase compensation method.



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