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Infact in such a way, n input voltages can be added. Thus the magnitude of the output voltage is the sum of the input voltages and hence circuit is called as summer or adder circuit. Due to the negative sign of the sum at the output it is called inverting summing amplifier. It shows that there is phase inversion. Non Inverting Summing Amplifier: The circuit discussed above is inverting summing op amp, which can be noticed from the negative sign in the equation 6.

But a summer that gives non-inverted sum of the input signals is called non inverting summing amplifier. The circuit is shown in the Fig. Let the voltage of node B is VB. Now the node A is at the same potential as that of B. From the input side, But as the input current of op-amp is zero, Equating the two equations 5 and 6 , Substituting equations 4 in 7 we get, The equation 8 shows that the output is weighted sum of the inputs.

This type of amplification circuit can be designed based on inverting or an non-inverting amplifiers. The single output from a summing amplifier can be determined by using the concept of the ohms law. Multiple input signals applied consists of resistors attached before it is connected to the terminal.

The value of the input is equivalent to its connected resistor that means that applied signals proportional to the number of resistors connected to it. What is a Summing Amplifier? An amplifier that is designed such that it adds up the applied input signals to generate the single output is defined as a summing amplifier.

It is very simple to construct. Even the functionality of this amplifier is simple to analyze. The audio mixer is one of the best examples of the summing amplifiers in which the signals are mixed with the help of a mixer or adder.

Changing the gain value of the summing amplifier is easier as it involves only the change of the input signal values. If the input signal value has to be constant in that case the resistor values can be altered accordingly to obtain the required gain.

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