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To learn more about LM go through LM various circuits as amplifier and comparator. Here we are building Adder circuit using Inverting Amplifier. So in order to understand the Summing circuit of Inverting Opamp , we have to look first at how an inverting opamp works in closed loop configuration.
The closed loop circuitry of inverting opamp is very useful and has two most important characteristics, which makes an opamp to use in various application and they are as follows Below is a closed loop inverting OpAmp circuit that is negative feedback is given from output to the input. And because of this negative feedback, voltage at inverting input becomes equal to the voltage at non-inverting input, hence creating a virtual ground. We know from the Inverting Op-amp Gain formulae ,.
Inverting adder circuit is similar to the above inverting amplifier in which the input voltages are given to the inverting terminal and non-inverting terminal is grounded, but the difference in Inverting adder circuit is it has multiple inputs at its inverting terminal.
Below is the circuit of Inverting Adder Circuit with two inputs at the inverting input. In the circuit the non-inverting terminal is grounded, and as seen in closed loop configuration, voltage at point B will be same as voltage at point A, 0V. Therefore the current I1 and I2 will flow into the resistor Rf the higher potential and not into the inverting terminal the lower potential of op-amp. The output voltage obtain will be the sum of the inputs and will be negative in nature since input are applied to the non-inverting terminal.
Here is the practical implementation of Opamp adder circuit using LM So in op-amp adder output voltage is proportional to the sum of input voltages. Control systems feedback control system transfer function and characteristic equation transfer function of electrical circuit. Dccircuits energy sources kirchhoffs current law kirchhoffs voltage law maximum power transfer theorem mesh analysis nodal analysis nortons theorem source transformations superposition theorem thevenins theorem.
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We have seen above that an inverting summing amplifier produces the negative sum of its input voltages then it follows that the non-inverting summing amplifier. The Op-amp comparator compares one analogue voltage level with another analogue voltage level, or some preset reference voltage, VREF and produces an output. An op-amp based adder produces an output equal to the sum of the input voltages applied at its inverting terminal. It is also called as a summing amplifier.