On July 1, 2020, the question pool for the Extra Class exam will change. If you’re studying to take the test after that date, you will need an updated study guide. This is the book you need.
The study guide is now available as a PDF or Kindle e-book, paperback, and Anki “smart” flash cards:
The study guide covers every single question in the question pool (more than 600 questions!) in my “no nonsense” style. Here’s an example (note that the text includes only the correct answers):
Calculating the gain and output voltage of an op amp circuit is relatively straightforward. The gain is simply RF/Rin. In the op amp circuit shown in Figure E7-3, Rin = R1. The output voltage of a circuit is then the input voltage times the gain.
QUESTION: What magnitude of voltage gain can be expected from the circuit in Figure E7-3 when R1 is 10 ohms and RF is 470 ohms? (E7G07)
ANSWER: 47If R1 is 10 ohms and RF is 470 ohms, the gain is 470/10, or 47.
While the gain of an ideal operational amplifier does not vary with frequency, op amps in the real world do have a finite bandwidth. Some modern op amps can be used at high frequencies, but many of the older ones can’t be used at frequencies above a couple of MHz. To find out if you can use an op amp at the frequency of your signals, check out the gain-bandwidth specification. The gain-bandwidth specification is the frequency at which the open-loop gain of the amplifier equals one.
QUESTION: How does the gain of an ideal operational amplifier vary with frequency? (E7G08)
ANSWER: It does not vary with frequencyQUESTION: What is the gain-bandwidth of an operational amplifier? (E7G06)
ANSWER: The frequency at which the open-loop gain of the amplifier equals one
It makes me very proud and happy that my study guides have helped so many folks get their licenses and upgrade to General and Extra Class. If you have any questions about the book, or about any of the questions in the question pool, please feel free to contact me.
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