Index / Electronic Components / Crystal Oscillator
Electronic Components
Crystal Oscillator
Quartz timing reference
A thin sliver of quartz cut along a precise crystal axis vibrates at an extraordinarily stable mechanical frequency when an oscillating voltage is applied. Couple it to a feedback amplifier and the result is a clock that drifts a few seconds per month, not per minute — the heartbeat behind every microprocessor, radio, GPS receiver and wristwatch.
Key specifications
Effect
Piezoelectric · Curie brothers, 1880
Common freqs
32.768 kHz (RTC) · 16 / 25 MHz (MCU)
Stability
±10 – ±50 ppm typical · ±0.1 ppm TCXO
First quartz clock
1927 · Bell Labs
Sheet 009 · Plate 1 of 1 · 1:1 infographic
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