21.20(a) is normally known as the Pierce crystal. The ensuing circuit frequency of oscillations is about because of the collection resonant frequency of the crystal. Variants in supply voltage, transistor parameters, and so on. don't have any impact on the circuit operating frequency and that is held stabilized via the https://consumer-electronics-crys04815.prublogger.com/34083411/the-smart-trick-of-consumer-electronics-crystal-oscillators-that-nobody-is-discussing