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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. As there is no phase difference between input and output, it is called non inverting summing amplifier.
So circuit acts like an averager. The gain for each input is given by the ratio of the feedback resistor Rf to the input resistance in the respective branch. It is already been said that a summing amplifier is basically an Inverting Amplifier with more than one voltage at the inverting input terminal. The output voltage for each channel can be calculated individually and the final output voltage will be the sum of all the individual outputs.
To calculate the output voltage of a particular channel, we have to ground all the remaining channels and use the basic inverting amplifier output voltage formula for each channel. The output signal is the algebraic sum of individual outputs or in other words it is the sum of all the inputs multiplied by their respective gains.
But if all the input resistances are chosen to be of equal magnitude, then the Summing Amplifier is said to be having an equal-weighted configuration, where the gain for each input channel is same. Sometimes, it is necessary to just add the input voltages without amplifying them. In such situations, the value of input resistance R1, R2, R3 etc. As a result, the gain of the amplifier will be unity. Hence, the output voltage will be an addition of the input voltages. However, it must be noted that all of the input currents are added and then fed back through the resistor Rf, so we should be aware of the power rating of the resistors.
Here, the input voltages are applied to the non-inverting input terminal of the Op Amp and a part of the output is fed back to the inverting input terminal, through voltage-divider-bias feedback. The circuit of a Non-Inverting Summing Amplifier is shown in the following image.
For the sake of convenience, the following circuit consists of only three inputs, but more inputs can be added. First and foremost, even though this is also a Summing Amplifier, the calculations are not as straight forward as the Inverting Summing Amplifier because there is no advantage of virtual ground summing node in the Non-Inverting Summing Amplifier.
Coming to VIN1, when V2 and V3 are grounded, their corresponding resistors cannot be ignored as form a voltage divider network. Then the input resistors are selected as large as possible to suit the type of the op-amp used. Voltage Adder Example Three audio signals drive a summing amplifier as shown in the following circuit. What is the output voltage? The sounds from different musical instruments can be converted to a specific voltage level, using transducers, and connected as input to a summing amplifier.
These different signal sources will be combined together by the summing amplifier and the combined signal is sent to an audio amplifier. An example circuit diagram of a summing amplifier as audio mixer is shown in the figure below. The summing amplifier can function as a multi-channel audio mixer for several audio channels.
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