Resistors Calculator Non Inverting Op-Amp

 

This calculator calculates the bias and feedback resistors for a non-inverting op-amp, given the gain and desired output bias point. First determine the desired gain of the ac signal and the quiescent output voltage witch is the value when the AC input signal is zero.

The input impedance of the simplified non-inverting amplifier is high, of order (the op amp's input impedance) × (open-loop voltage gain of the op amp) times the closed-loop gain.



Resistors Calculator

of Non-Inverting Op-amp

Enter the Parameters
Vout Volts
Gain Volts
R1 KOhms
V1 Volts
V2 Volts
Vp Volts
Vn Volts

Output Results
R2 KOhms
R3 KOhms
R4 KOhms


In the case of the ideal op amp, with (open-loop voltage gain of the op amp) infinite and (the op amp's input impedance) infinite, the input impedance is infinite. In this case, though, the circuit will be susceptible to input bias current drift because of the mismatch between the impedances driving the V+ and V- op amp inputs.

Choose the value of R1 that will scale the other two resistors. V1 is the input voltage for the inverting Op-Amp, V2 is the voltage offset if its needed and set V2 to zero if no offset is required.

A non-inverting amplifier is a special case of the differential amplifier in which that circuit's inverting input V1 is grounded, and non-inverting input V2 is identified with Vin above, with Rg » R2. Referring to the circuit immediately above,




To intuitively see this gain equation, use the virtual ground technique to calculate the current in resistor R1:

then recall that this same current must be passing through R2, therefore:




A mechanical analogy is a class-2 lever, with one terminal of R1 as the fulcrum, at ground potential. Vin is at a length R1 from the fulcrum; Vout is at a length R2 further along. When Vin ascends "above ground", the output Vout rises proportionately with the lever.




 


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