Question Pool -- Category E6E

What technique is used to construct low-cost, high-performance crystal filters?
A.
Choose a center frequency that matches the available crystals
B.
Choose a crystal with the desired bandwidth and operating frequency to match a desired center frequency
C.
Measure crystal bandwidth to ensure at least 20% coupling
D.
Measure crystal frequencies and carefully select units with less than 10% frequency difference

Answer is D.
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