Crystal Filters Although not an active filter, crystal (Quartz) filters are very high-Qfilters.SomecanhaveQs approaching 100,000. HighQ means
Question:
Crystal Filters Although not an active filter, crystal (Quartz) filters are very high-Qfilters.SomecanhaveQ’s approaching 100,000. HighQ means high selectivity; hence, crystal filters are used extensively in communications where fine tuning is essential. In its simplest form, a quartz crystal is a rectangular cut crystal with metal plates attached to its flattest sides – imagine a parallelplate capacitor with the crystal as the dielectric. An electronic equivalent of a quartz filter is shown in Figure P14–66. CO is called the shunt capacitance andC1 ,L1, andR1 the mechanical capacitance, inductance, and resistance of the crystal, respectively.
Aparticular crystal hasCO¼1.0pF,C1¼2.6 fF,L1¼6.0 mH, and R1¼35V. AssumeRL¼10V. Analyze this filter and determine itsQandv0. UseMATLABor OrCADto examine this circuit and help calculate the requested parameters.
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The Analysis And Design Of Linear Circuits
ISBN: 9781118214299
7th Edition
Authors: Roland E Thomas, Albert J Rosa, Gregory J Toussaint