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Skolnik’s Op Amps 101 Challenge

Skolnik’s Op Amps 101 Challenge. Try our brainteaser and have some fun! Press “page down” to continue. What is the output voltage?. The power supplies are connected to the correct pins. Press the “page down” to move to the next slide. ANSWER. If you guessed +2V, congratulations!.

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Skolnik’s Op Amps 101 Challenge

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  1. Skolnik’s Op Amps 101 Challenge Try our brainteaser and have some fun! Press “page down” to continue.

  2. What is the output voltage? The power supplies are connected to the correct pins. Press the “page down” to move to the next slide.

  3. ANSWER • If you guessed +2V, congratulations! Press the “page down” to move to the next slide.

  4. What is the function of this circuit? Press the “page down” to move to the next slide.

  5. ANSWER • Peak detector? Good job. Give yourself 5 points. • However, did you catch the fact that it will not work at all? It will not work at all due to Ibias issues. By the way, this is a very common problem amongst inexperienced design engineers. Press the “page down” to move to the next slide.

  6. What is the output of this Voltage Follower? Press the “page down” to move to the next slide.

  7. ANSWER • If you guessed 4Vrms @ 60 kHz, then you are incorrect. • Why? We will give you one hint. Press the “page down” to move to the next slide.

  8. Hint… This is the scope showing the input (yellow) and the output (blue). The vertical sensitivities are the same for channel 1 & 2. The problem is that output voltage is definitely lower in amplitude than the input. Press the “page down” to move to the next slide.

  9. ANSWER • The LM741 has a maximum GBW and slew rate. Since the signal amplitude is considered to be large, the slew rate limitation is dominant and prevents an accurate signal at the output. • The amplitude is less than expected. Notice the phase-shift from the input to the output, as well. Press the “page down” to move to the next slide.

  10. Last challenge… This circuit is working beautifully. Can you guess its name? Press the “page down” to move to the next slide.

  11. ANSWER • A differential amplifier with a gain of 2. • Now for the real challenge…the next slide is the same circuit with a resistor shorted across its leads. Can you determine which resistor is shorted out (from lead to lead, i.e. it looks like a zero Ohm resistor)? Press the “page down” to move to the next slide.

  12. Which resistor is shorted out? Press the “page down” to move to the next slide.

  13. Op-Amp 101 Class • We hope you enjoyed these brainteasers. • These are a few of the many concepts that we explore in the Skolnik Technical Training Op-Amps 101 class. • Click here to learn more about Skolnik’s Op-Amps 101 class. The End

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