SaM - Types of Cut Quartzes

Remeber:

• How you cut a quartz crystal changes its properties (or mode), more specifically different types of cuts have different elastic, piezoelectric and dielectric properties.
• We have seen the modes: longitudinal, thickness shear, flexural, face shear, and tuning fork:
  
  These modes’ names reflect how the cut-quartz works.
• One Example is that the Thickness-Shear Mode is particular for a BT-Cut.
  
• ==Cut-Quartzes work in in frequency up to $30$ MHz, and the “thickness shear mode” has the highest frequency range==.IMPORTANTE
• Also this frequency changes with temperature, and all cuts have a slope around $T_A$ (ambience temperature), this slope is important for stability: IMPORTANTE
  

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There are different quartz type available. ==They work in frequency up to $30$ MHz==. Their name reflect how they work:

• Thickness shear mode: highest frequency range.

Type of quartzes:

Behaviour of the quartz:

Behaviour of the quartz with respect to temperature:

• ppm: part per milion $=10^{-6}$.
• The slope around $T_A$ is imporant for stability.

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