Non Inverting Summing Amplifier Equation. Design of non inverting summing circuit is approached by first designing the non inverting amplifier to have the required voltage gain. The standard equation for the voltage gain of a non inverting summing amplifier circuit is given as.
In the previous inverting amplifier tutorial we said that for an ideal op amp no current flows into the input terminal of the amplifier and that v1 always equals v2 this was because the junction of the input and feedback signal v1 are at the same potential. V b non inverting input voltage. The output voltage of the circuit is governed by the equation.
V b non inverting input voltage.
If we make this closed loop voltage gain equal to 2 by making r a r b then the output voltage v o becomes equal to the sum of all the input voltages as shown. The output voltage vout value can find out for the summing amplifier with the help of the equation shown below. 1 the first term of the product is the actual summing while the second term is a gain due to the r3 and r4 resistors. The voltage inputs va vb and vc are applied to non inverting input of the opamp.
