Crystal Oscillator Circuit Design

We ll examine the operational theory of crystal oscillators and design a discrete pierce crystal oscillator suitable for use as a local oscillator in an hf receiver.

Crystal oscillator circuit design.

It consists of ic 4060 and ic 4013 the ic 4060 single acting oscillator and counter. These types of oscillator is practically invariably of the l c variety for functioning frequencies of a few hundred khz and above. In this type of crystal oscillator design the filter consists of the crystal s equivalent model and the external load capacitors. A series circuit crystal oscillator uses a crystal that s designed to operate at its natural resonant frequency.

Topics include load capacitance negative resistance startup time drive level dependency crystal aging and spurious modes. The exact frequency at which an oscillator will operate is dependent on the loop phase angle shifts within the oscillator circuit. This tutorial explains considerations to be addressed in a design of a simple crystal oscillator using at cut crystals. Circuit and design description march 1 2016 by ajay kumar crystal oscillator is an electronic oscillator used to create an electrical signal of precise frequency by using the vibrating crystal mechanical resonance made of piezoelectric material.

There s no need for capacitors in the feedback loop for this type of circuit. Ever wonder what goes in to the design of a crystal oscillator. Figure 2 4 shows the maximum drive power that can be put into a crystal without excessive heating and frequency shift in the crystal fig ure 2 5 shows the maximum permissible drive voltage across the crystal at exact series resonance. Of the frequency determined by the resistor and external capacitor.

3 cd4060 crystal oscillator circuit this is a 1hz oscillator circuit for a standard digital clock frequency size 1 hz or 2 hz. It will create an electrical signal with a given frequency. My discrete pierce oscillator design tool can be found here. It can be used in the normal clock circuit.

A crystal oscillator is an electronic oscillator circuit that is used for the mechanical resonance of a vibrating crystal of piezoelectric material. References and additional reading are listed below. 200 000 r is the largest single factor in oscillator design and dominates the design of every oscillator circuit. The design of a crystal oscillator is very similar to the design of the colpitts oscillator we looked at in the previous tutorial except that the lc tank circuit that provides the feedback oscillations has been replaced by a quartz crystal as shown below.