Figure bellow shows how can an operational amplifier be used to perform the integration function. The switch is used to determine the starting point of the process as the output voltage is function of time.
Formula:
Integration:
Where:
Uout is the output voltage in volts (V)
U1, U2, U3....Un are the input voltages in volts (V)
R1, R2, R3....Rn are the resistances in ohm (Ω)
C is the capacitance in farads (F)
