The circuit of DC inverting amplifier whose gain is decided by the ratio

Published:2011/7/27 8:24:00 Author:Fiona | Keyword: DC reversed-phase amplifier | From:SeekIC

Circuit WorkBecause the OP amplifier inverting input is grounded, inverting input in the linear operating range is zero level. So the input resistance of the circuit is R1, if R2 remains unchanged, the input resistance decreased with the increased gain. Due to there has input bias current IB flowing through in the OP amplifier, if removing the resistance R3, it will produce additional bias. If you are using FET input type OP amplifier, you can save R3. Because the magnification is 10 times,the circuitneeds toincrease the offset adjustment circuit, in the 741-type OP amplifier, the circuit connects the 10 k ohms variable resistor between 1,5 lead.



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