Operational amplifier attenuation circuit diagram

Published:2011/8/19 2:15:00 Author:Jessie | Keyword: Operational amplifier, attenuation | From:SeekIC

Reversed-phase composedof op-amp attenuator is shown in figure 1 . In the circuit, R2 is less than R1. This method is not recommended, because many op-ampsare not suitable for the working condition ofthe magnification whichis less than 1. Accurate method is to use figure 2 circuit. In table 1, a set of normalization of R3 resistor can be used to produced different level attenuation. The other resistors can use the following formula: R3＝(Vo/Vin)/(2-2(Vo/Vin)).



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