ELEC 254 Opamp Part 1

Good morning!

How are you feeling today?

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Did you get a chance to complete Quiz 1?

• Yes, I completed!

• Yes, but I need to try the second attempt.

• Not yet!

  Will complete today before the deadline (11:59pm).

• Thanks for the reminder! I slipped my mind!

What is the name of the following device?

What are the values of i+ and i- in the following circuit?

• i- = infinity,

  i+ = infinity

• i+ = 0,

  i- = infinity

• i+ = infinity,

  i- = 0

• i+ = 0,

  i- = 0

What is the limitation of an open-loop op-amp and why do we use closed-loop op-amp circuit?

In a closed-loop op-amp, the feedback circuit is connected between ____ and ____.

• output pin, inverting input

• output pin, non-inverting input

• inverting input and non-inverting input

• inverting input and ground

Draw the output waveform for an inverting amplifier with a gain of 10. Assume that the input signal is an AC signal with 100mV peak value as shown in the graph. The DC supply is +10V and -10V.

Draw the output waveform for a non-inverting amplifier with a gain of 500. Assume that the input signal is an AC signal with 100mV peak value as shown in the graph. The DC supply is +10V and -10V.

Now consider the following noisy AC signal. We use a non-inverting amplifier to amplify this signal. Assume that the gain is enough to amplify this signal without clipping (saturation). Draw the output waveform.