Non investing op amp attenuator circuit

This is not a good idea, as most op amps are compensated to have a stable gain of Below that value, the op amp actually becomes unstable due to multiple parastics in the IC causing the phase margin to approach degrees and making the denominator of the loop gain equation go to zero.

In other words, an op amp is least stable when it is operated at minimum gain, which is counter intuitive for most engineers. For more information, consult my book: Op Amps for Everyone. The inverting attenuator below uses a "T" pad to accomplish attenuation and avoid the instability issue completely. The calculator only uses two values of resistor: R1 and R2. Since all R2's are the same value, the gain of the circuit is Adding R1 reduces the gain from 1 to a lower value.

This can be achieved by inserting a high value resistor, R3 in the diagram, to ground as shown below. If this resistor is not inserted the output of the operational amplifier will be driven into one of the voltage rails. The cut off point occurs at a frequency where the capacitive reactance is equal to the resistance. Similarly the output capacitor should be chosen so that it is able to pass the lowest frequencies needed for the system.

In this case the output impedance of the op amp will be low and therefore the largest impedance is likely to be that of the following stage. Single supply non-inverting amplifier Operational amplifier circuits are normally designed to operate from dual supplies, e. This is not always easy to achieve and therefore it is often convenient to use a single ended or single supply version of the electronic circuit design. This can be achieved by creating what is often termed a half supply rail. The non-inverting op amp circuit is biased at half the rail voltage.

By setting the operating point at this voltage the maximum swing can be obtained on the output without clipping. Single supply rail non-inverting operational amplifier circuit. When using this circuit there are a few are a few points to note: Bias voltage: The bias voltage for the non-inverting amplifier is set up by R3 and R4. Normally the input impedance of the op amp itself will be higher than the resistors and therefore it can be ignored.

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