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shawrix

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Why is it necessary for the gain magnitudes of inverting and non- inverting ends to be equal in magnitudes to be able to reject the common mode signal?

Also can someone explain the ratio obtained of voltage divider in difference amplifier.

R4/R4+R3[1+R2/R1]= R2/R1 Where,

R1 input resistance, R2 feedback resistor, R3 and R4 are voltage dividers used to attenuate the positive gain.

Also can someone explain the ratio obtained of voltage divider in difference amplifier.

R4/R4+R3[1+R2/R1]= R2/R1 Where,

R1 input resistance, R2 feedback resistor, R3 and R4 are voltage dividers used to attenuate the positive gain.

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