21.20(a) is generally called the Pierce crystal. The resulting circuit frequency of oscillations is ready via the sequence resonant frequency on the crystal. Versions in supply voltage, transistor parameters, etcetera. have no effect on the circuit working frequency and that is held stabilized through the crystal. The circuit frequency stability https://kameronfbgkd.bloginder.com/35648190/a-secret-weapon-for-timing-components-for-consumer-electronics