In this lab, we implement a simple operational amplifier-based circuit. Since operational amplifiers are used commonly in circuits used to implement mathematical operations we implement the processes of summing two voltages.
Design an inverting summing circuit which performs an addition of two signals. The input resistance seen by the two voltage sources(Va and Vb) should be at least1kQ.
Find threes resistances, their theory values are two 1k ohm and one 100 ohm.
Experiment set up;
In this lab, we implement a simple operational amplifier-based are used commonly in circuits used to implement mathematical operations, we implement the process of taking the difference between two voltages.
In this lab we find four resistances of same theory ohm. and their true values all are 9.7k ohm.
Experiment set up:
1) When Vb = 1V; calculate the all theory output voltages, record the all true output voltages, and calculate all percent different.
2)When Vb = -1V; calculate the all theory output voltages, record the all true output voltages, and calculate all percent different.
When we use Vb as 1 V， we find V out, and calculate the percent difference.
Graph of Vout vs. Va
When we use Vb as -1 V, we find V out, and calculate the percent difference.
Graph of Vour vs. Va.
When two graphs are combined together, a graph Vout VS. Vin is gotten. the positive saturation is around 3.5V, the negative saturation is around -4V.
Conclusion: when there is above 3.5V or -4V are supplied, the ideally the voltage op-amp should show out 5V. However, this op amp is cheap, so it causes some energy lose.
Summary:
Today, I learn about op-amp, and how to use it when we apply a voltage. although the op-amp is used as ideal, even there are an input resistance and an output resistance.
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