Crystal Oscillator Capacitor. The pierce oscillator has many desirable characteris tics. Essentially the pulling the frequency of a crystal oscillator requires the load capacitance to be changed.
Capacitors c2 and c3 are used to stabi lize the amount of feedback preventing overdrive to the transistor amplifier. This will change the frequency of the oscillation enabling it to be trimmed to the required value within the available range. C1 and c2 are the two capacitors that you see attached to the crystal but you might be wondering what cstray is.
Crystal oscillators must be designed to provide a load capacitance.
Quartz crystal is mainly used in radio frequency rf oscillators. Essentially the pulling the frequency of a crystal oscillator requires the load capacitance to be changed. Quartz crystal is the most common type of piezoelectric resonator in oscillator circuits we are using them so it became known as crystal oscillators. Crystal oscillators must be designed to provide a load capacitance.
