1) If it is not already done, set Ve to 2V, R1 and R2 to 1kOhm. What’s the value (and the sign) of the amplification Vs/Ve ? What’s the value of ε ? Compare your results to the theoretical values. Then, use the amplification curve Vs(Ve) to find the amplification value (use the “view” tab to display it).

2) Set R2 to 5 kΩ. Modify the range of Vs. What’s the value (and the sign) of the amplification Vs/Ve ? What’s the value of ε ? Compare your results to the theoretical values. Then use the amplification curve Vs(Ve) to find the amplification value.

3) Set R2 to 10 kΩ. Why? Why is it different from zero? Considering the ideal op-amp Vs(ε) characteristics, explain this observation (cf. §1.5). What are the saturation voltage values Vsat+ and Vsat- ?

4) Set R1 to 2kΩ. Explain why the saturation disappears.
Calculate the Ve value that brings the system again to saturation. Verify your results in the Virtual Lab.

5) Set R2 to 1kΩ. Verify that Vs remains greater than Ve.