Pierce Crystal Oscillator Circuit Diagram

The pierce oscillator is a crystal oscillator that uses the crystal as part of its feedback path and therefore has no resonant tank circuit.

Pierce crystal oscillator circuit diagram. The pierce oscillator is a type of electronic oscillator particularly well suited for use in piezoelectric crystal oscillator circuits. Here is the circuit. In the above circuit x1 indicates the crystal device r1 resistor as a feedback resistor u1 is a digital inverter c1 and c2 are the parallel connected capacitors. Edson did a study of vhf harmonic oscillator circuits in 1950 181 and published his classic book on vacuum tube oscillators of all types in 1953 q.

Amount of oscillator circuit development along the way. The following figure 1 shows the simple pierce oscillator diagram and figure 2 shows the simplified circuit diagram of a piercing oscillator. This circuit uses q 2n3823 that is maintained thus insuring good stability of frequency because the crystal does not loaded by the jfet. Pierce 1872 1956 the pierce oscillator is a derivative of the colpitts oscillator virtually all digital ic clock oscillators are of pierce type as the circuit can be implemented using a minimum of components.

The pierce oscillator is very similar in design to the previous colpitts oscillator and is well suited for implementing crystal oscillator circuits using a crystal as part of its feedback circuit. In 1965 firth published his design handbook lo on the pierce circuit and the butler common base harmonic circuit. The pierce oscillator is primarily a series resonant tuned circuit unlike the parallel resonant circuit of the colpitts oscillator which uses a. This is a simple jfet pierce crystal oscillator.

Oscillator design guide for stm8af al s stm32 mcus and mpus introduction many designers know oscillators based on pierce gate topology hereinafter referred to as pierce oscillators but not all of them really understand how they operate and only a few master their design. We can use a wide frequency range of crystal using this circuit without circuit modification. The circuit diagram of a cmos hartley oscillator is shown in below diagram. This is very identical in functioning to the pierce oscillator which was explained previously the difference being that a centre tapped l c circuit is employed instead of the capactively centre tapped crystal.

The pierce oscillator uses a jfet as its amplifying device as it provides a very high input impedance with the crystal connected between the output drain terminal and the input gate terminal as shown below.