Please let me know how to decide R3 resistance constant when Gain is changed.(I refer to figure 45).
I would like to use bipolar mode and fixed reference.
The effects of the R3, R4, and R5 on the output voltage on figure 45 is as follows:
According to figure 45, R3 = 20kΩ = R5, and R4 = 10kΩ. Applying these values will give you the same equation for the output of the bipolar mode.
It is observed that changing the resistance values will affect your output voltage.
On the other hand, if you want to have a gain on your equation, you may incorporate the circuit similar to figure 48.
Please let me know if you have any further questions.
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