is there a way in which i can calculate resistor values instead of solving this complex equations

Thread Starter


Joined Feb 1, 2018
I am desiging non inverting amplifier with inverting postive reference voltage circuit.
I will have to solve these equations to know the resistor values. is there a way i can solve these equations simply by inserting input voltage range, output voltage range, reference voltage?



Joined Aug 21, 2008

You can make this a lot simpler my looking at the circuit as two circuits and solve each one.

Simply find the values of R3 and R4 to give the offset voltage in the correct proportion to the input voltage. This is a simple resistive voltage divider problem.

After that use the formula below to calculate the resistor values needed to scale the offset signal at the noninverting input to the desired amplitude on the output.

The formula: The output of the amplifier is the voltage on the noninverting input times (1 + (R1/R2)).

Gain of a noninvertng amplifier: