Differential Amplifier Circuit Formula. Where n is the number of inputs. Then from superposition theorem the output voltage v out is equal to v out a v1 vin1 a v2 vin2.
The circuit diagram of a differential amplifier using one opamp is shown below. R1 r2 r3 r4 then the circuit will become a unity gain differential amplifier and the voltage gain of the amplifier will be exactly one or unity. 2 v v ocm 2 in od β v v 2v 2 in out ocm β v v 2 in out β and with β2 0 the gain is twice that of an inverting amplifier without the minus sign.
11 differential amplifier circuits 295 and vout2 2 v v out d out c 11 4 let a v1 v out1 v in1 be the gain of differential amplifier due to input v in1 only and a v2 v out2 v in2 due to input v in2 only.
After substituting v in1. This gives a value for n. R1 r2 r3 r4 then the circuit will become a unity gain differential amplifier and the voltage gain of the amplifier will be exactly one or unity. R1 and r2 are the input resistors rf is the feedback resistor and rl is the load resistor.
