21.twenty(a) is mostly known as the Pierce crystal. The resulting circuit frequency of oscillations is about through the series resonant frequency from the crystal. Variations in supply voltage, transistor parameters, etc. haven't any impact on the circuit running frequency and that is held stabilized because of the crystal. The circuit https://timingcomponentsforconsum93604.59bloggers.com/35421926/the-smart-trick-of-consumer-electronics-crystal-oscillators-that-nobody-is-discussing