Adder And Subtractor Using Op Amp. After conducting this experiment students are able to design the circuits using op amps to perform addition subtraction and comparison operations. In this post we are going to study the operational amplifier as an adder or summing amplifier and operational amplifier as op amp subtractor.
Since input current to the op amp is zero the two currents are added to get current i which flows through the feedback resistance rf. An operational amplifier often op amp or opamp is a dc coupled high gain electronic voltage amplifier with a differential input and usually a single ended output. Whereas the input voltage v3 which is applied at inverting terminal gets subtracted from input at non inverting terminal.
To find output voltage v 01 due to v 1 alone make all other input voltages v 2 v 3 and v 4 equal to.
The input voltages v1 and v2 applied at non inverting terminal of op amp get added. To get output due to v3 alone make v1 and v2 equal to zero. After conducting this experiment students are able to design the circuits using op amps to perform addition subtraction and comparison operations. The output voltage v o can be obtained by using superposition theorem.
