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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

Crystal Oscillator
FIG. 009 — Crystal OscillatorBlueprint Atlas · Electronic Components

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