Phys 351 lab 5

# Phys 351 lab 5 - Lab 5 Op-Amps Part 1 A Open Loop Bandwidth...

This preview shows pages 1–3. Sign up to view the full content.

Lab 5: Op-Amps- Part 1 A: Open Loop Bandwidth and Phase Lag A-1. Open Loop Behavior In part A-1, an Op-Amp was wired up to a potentiometer as shown in the figure below. - The output voltage when V3>0 was observed to be 14.7V. - The output voltage when V3<0 was observed to be -14.0V. - The output voltage as V3 approaches zero should be Zero. This is because there is no voltage to be amplified, and A*V3= 0 when V3 = 0. It was observed that this point was very hard to reach, and it would jump from -14V to 14.7V but never stabilize on zero. - Swapping the input from V3 to V2 led to the following results, when V2>0 it was observed that the output was -14.1V. When V2<0, the output was observed to be 14.7V. Changing the input from the positive terminal to the negative terminal led to an inverted output. Section B: Inverting and Non-Inverting Op-Amps B-1. Inverting Amplifier In part B-1, an inverting amplifier was built such that the output amplitude was 14Vpp. A sinusoidal 1kHz signal was applied to the input. The following circuit was built

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
- With an input voltage of 1.5V, an output voltage of 14.0 was observed. These two measurements give a gain of -9.33. The expected gain would be -10 Ohm / 1 Ohm, or a gain of -10. The percent difference is 6.7%. - The frequency was scanned from a range of 100Hz to 20MHz and the output voltages measured at each frequency. The following figure shows the data in graphical form. Gain vs Frequency 0 1 2 3 4 5 6 7 8 9 10 3.5 8.5 13.5 ln(Frequency) Gain Series1 - The same procedure was done on EWB and the following bode plot was produced - The f3db point found in lab was observed to be around 100kHz. The phase difference at this point was observed to be 200 degrees.
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern