Crystal Oscillators (XTAL) - University of California ...
Fundamental Resonant Mode Acoustic waves through the crystal have phase velocity v = 3×103m/s.For a thickness t = 1mm, the delay time through the XTAL is given by τ = t/v = (10−3m)/(3×103m/s) = 1/3µs. This corresponds to a fundamental resonant frequency
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