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Pierce-gate oscillator crystal load calculation

Published by Crystek Corporation

The Pierce-gate oscillator is well recognized by most designers, but few Tunderstand how to specify the crystal correctly. The crystal used in the topology can be either a fundamental AT-CUT or BT-CUT.

A BT-CUT crystal has poor frequency stability over temperature compared to an AT-CUT. This topology uses a parallel crystal and not a series crystal. When a parallel crystal is specified, the crystal manufacturer will also require that you specify a load capacitance.

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