Transcription of Pierce-gate oscillator crystal load calculation
{{id}} {{{paragraph}}}
Example: quiz answers
Pierce-gate oscillator crystal load calculation
2004 Design TipPierce- gate oscillator crystal load calculationBy Ramon Cerdahe Pierce-gate oscillator of Figure 1 is well recognized by most designers, but fewTunderstand how to specify the crystal correctly. The crystal used in the topology ofFigure 1 can be either a fundamental AT-CUT or BT-CUT. A BT-CUT crystal has poorfrequency stability over temperature compared to an AT-CUT. This topology uses aparallel crystal and not a series crystal . When a parallel crystal is specified, the crystalmanufacturer will also require that you specify a load understand load capacitance, think of a series LC circuit wherethe crystal is the L and the load capacitance is the C. The resonancefrequency of the LC circuit will vary as a function of L and C. But inthe crystal case, the L is fixed (temperature not being a parameter).The parameter on the crystal data sheet that is controlled by theload capacitance is the tolerance or calibration of the center fre-quency at 25 C.
80 www.rfdesign.com July 2004 Design Tip Pierce-gate oscillator crystal load calculation By Ramon Cerda The Pierce-gate oscillator of Figure 1 is well recognized by most designers, but few
Tags:
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document: