Everything You Need to Know and More About Crystal Oscillators
It is important that you have a good understanding about how crystal oscillators work. The first thing you should know about it is that it is one kind of electronic circuit where at a specific frequency, will be able to produce electrical oscillations. The physical characteristics that are present in the crystals such as quartz are what help determine that frequency for this particular electronic circuit that will be placed in the circuit feedback loop.
A lot of purposes can be drawn from the use of these crystal oscillators. Such circuits are best used for purposes that involve communications as well as electronics. Basically, any systems where their function depends greatly on the accuracy of coordination and time measurement will be making the most of this particular type of circuit. Time frequency generators have become more stable through them. These generators help in the provision of pilot and carrier signals for use in navigation and electronic communication systems. The clock signals that will be used in any data processing equipment can also benefit from these crystal oscillators. They can also provide references signals that are used for specialized systems. The required stability and accuracy of the output frequency of these crystal oscillators will depend on their purpose. 1000 PPM is the frequency range that usually begins with the clocks that only make use of simple microprocessors. For systems that require frequency control that is very much precise, about less than 5 PPM frequency is required.
If you take a closer look at crystal oscillators, you will see that they are built up of a feedback network as well as an amplifier. This feedback network which it contains takes charge in selecting what output of the amplifier must be returned back to its input. There are two key factors that affect how oscillator circuits work. Firstly, the gain loop must be equal to the unity or be greater than what the oscillator loop will be losing. The phase shift of the loop being equal to 360 or 0 degrees is the second factor. In simple terms, angle shifts that happen in loop phase are telling of the frequency that is required for these crystal oscillators to work. There will be a change in the oscillator circuit output frequency even with just minor changes happening on angle of the net loop phase. Having a quartz crystal in place in the feedback loop aids in being able to reduce shifts in net phase.
With crystals having stable temperatures and having high frequency stability as well as some excellent processing properties, there is no doubt why the use of crystal oscillators will bring about a number of benefits in various applications. In addition, crystal oscillators are able to achieve a high degree of frequency stability as well as accuracy that you seldom see in other electronic circuits.