On the Difference Between Proteus Simulation Program and Practice in Single Power Supply Use of μA741

Abstract

Since the use of simulation software is widely used in designing electronic circuits, it is very important to increase the accuracy of the simulation program. We found the difference between the simulation results of the simulation software Proteus and the experiment results in the single power supply use of the μA741 operational amplifier and verified the experimental results through the analysis of the internal structure of the μA741 op amp. In the Proteus 8.15 simulation program, the inverting input level of the op amp using a single power supply varies according to the value of the negative feedback resistor. The experiment showed that when using a single power supply of 15 V and applying negative feedback to μA741, the inverting input voltage is almost 2 V rather than 1.5 V.