Discussion
Consider the following statements about crystals.
1. The parallel resonance lies slightly above the series resonance
2. The crystal is inductive between the two resonances
3. A crystal's quality factor is typically a few hundred
Which of the statements given above is or are correct?
Answer: B
The first two are correct and the third understates by orders of magnitude: a crystal's quality factor runs from tens of thousands to over a million, while a few hundred is what a good LC tank achieves. That gap is the entire reason crystals are used, so getting the magnitude right matters more than the exact figure. A statement that is qualitatively right and quantitatively wrong by four orders of magnitude is still wrong in the way that counts.
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