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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. In this type of operational amplifier, multiple resistors are connected to each of the applied input signals. These are summed up in such a way that an individual output signal is obtained.
It is generally an inverting amplifier with the multiple input signals. A non-inverting summing amplifier can be designed similar to that of the inverting amplifier. In this case, the input signals are applied to the non-inverting terminal whereas the feedback is provided to the inverting terminal. This is possible by the voltage divider biasing circuit. To design these amplifier circuits firstly it is designed based on the required gain. Once it is done then the necessary resistors are arranged based on it.
If the resistors considered are equal then in such case the output value of the voltage will be given as. Let us consider the summing amplifier designed based on the inverting amplifier with the multiple input signals applied to it. Its value of the output voltage can be calculated as. The output voltage Vout value can find out for the summing amplifier with the help of the equation shown below. If the values of the resistors are not equal in such case the amplifier is known as scaling amplifier which is type of summing amplifier.
But here we are considering the summing circuit with equal resistance values. Then, in that case, the equation can be written as. Hence the above equation is useful while calculating the value of the output voltage for the summing amplifier with the three applied input signals. These are the basic converters in which the basic digital values that are in the form of binary equivalents are converted in terms of analog data. Hence these are known as digital to analog converters.
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. 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 V B. 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 ,. The equation 8 shows that the output is weighted sum of the inputs. As there is no phase difference between input and output , it is called non inverting summing amplifier.
In this Inverting Amplifier circuit the operational amplifier is connected with feedback to produce a closed loop operation. When dealing with operational. The Summing Amplifier is another type of operational amplifier circuit configuration that is used to combine the voltages present on two or more. An inverting op-amp can be used in various places like as Op amp Summing Amplifier. One important application of inverting op-amp is summing.