Op Amp Attenuator Circuit. For example a 10 1 attenuator can be implemented with rf 1 kω and rg 10 kω. Minimizes current drawn from input side of op amp circuit.
When using an amplifier as an attenuator the amplifier has less than unity gain g 1. R1 10kωin most cases. If you remove r1 the circuit reverts to an inverting gain stage with rg r2a r2b and rf r2c r2d.
Since the op amp input is high impedance the attenuation is set by the resistor divider.
As well as resistors and capacitors that are passive components operational amplifiers are one of the basic building blocks of analogue electronic circuits. One very useful feature of an op amp is impedance transformation. Operational amplifiers op amp are linear devices that have all the properties required for nearly ideal dc amplification and are therefore used extensively in signal conditioning or filtering or to perform mathematical operations such as adding subtracting integration and differentiation. For example a 10 1 attenuator can be implemented with rf 1 kω and rg 10 kω.
