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Operational amplifier attenuation circuit diagram

2015-01-02 19:28  
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Operational amplifier attenuation circuit diagram
Operational amplifier attenuation circuit diagram
Operational amplifier attenuation circuit diagram
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)).