Quartz crystal oscillator is a quartz crystal resonator made of quartz material, which plays a role in generating frequency, has stability and good anti-interference performance, and is widely used in various electronic products. Quartz crystal oscillator is a kind of crystal oscillator. The correct classification method of crystal oscillator is quartz crystal and ceramic crystal. It is not difficult to see that both quartz and ceramic are the names of crystal materials. Quartz crystal oscillator is an electronic component used for frequency stabilization and frequency selection. It has been widely used in various electronic equipment such as wireless phones, carrier communications, radio and television, satellite communications, digital instruments, clocks and watches. This article introduces the basic knowledge about quartz crystal resonators and oscillators, and correctly points out the differences and similarities between crystal resonators and crystal oscillators.
The quartz crystal resonator is a passive crystal, and the quartz crystal oscillator is an active crystal from the professional point of view. The difference between passive crystal and active crystal is that the former has no voltage range and the latter has voltage; another difference is that the price of the latter is often several times higher than the price of the former. The two professional ranking terms are like twins, with only one word difference. And it is the difference of this word that the attribute parameters of the two have absolutely different roles in the circuit board. How to distinguish between quartz crystal resonator and quartz crystal oscillator correctly. In short, what is the difference between a crystal resonator and a crystal oscillator. After all, quartz is just their material, we can ignore it.
What both have in common
1. Both crystal resonators and crystal oscillators have SMD packages and plug-in packages.
2. The use range of crystal resonator and crystal oscillator are the same. Communication, wireless, GPS can be seen everywhere.
The difference between the two
1. The price of crystal oscillators is often higher than that of crystal resonators.
2. The crystal oscillator parameter has a voltage unit, and the crystal resonator parameter does not have a voltage unit.
3. The crystal oscillator pins are all 4 pins or more, including 4 pins. Crystal resonators are usually 2 pins or 4 pins, and there will be no crystal resonators with 4 pins or more.
4. The height of the crystal oscillator is often higher than that of the crystal resonator.
5. The crystal oscillator will not be made of ceramic material, because compared to quartz material, ceramic material does not have enough stability and is far less accurate than quartz material. Crystal resonators are made of quartz and ceramic materials. What we commonly call ceramic resonators is one of crystal resonators. Among the ceramic resonators, Murata Jingzhen has the best stability and reputation.
6. The working properties of the crystal oscillator and the crystal resonator are inconsistent. The crystal oscillator can start oscillating without the help of external components, because there is an oscillation chip inside the crystal oscillator. The crystal resonator needs external components to start the oscillation.
There is only one word difference between crystal resonator and crystal oscillator. And for you who are sometimes careless, do you think that the crystal oscillator is the general term for the crystal oscillator. And smart purchase can already tell that crystal and crystal oscillator are not two components with the same properties. It seems that as a purchaser, I also worked a lot secretly.
555 voltage controlled oscillator circuit diagramAt present, the 555 time base circuit has been widely used because of the unique advantages of the circuit itself. According to the application characteristics of 555, the circuit is divided into the application method of multivibrator, the application method of monostable circuit, the application method of bistable (R-S) trigger circuit and the application method of Schmidt circuit. The voltage-controlled oscillator (VCO) discussed in this article is a special-structured multivibrator called a voltage-controlled multivibrator (VCO). The voltage-controlled oscillator (VCO) composed of 555 circuits has the characteristics of simple circuit, low cost, and good pulse waveform linearity. Therefore, the voltage-controlled oscillator (VCO) circuit is widely used in fields such as phase lock, A/D conversion, pulse modulation, telemetry, etc., and is a very important circuit.
Voltage controlled oscillator composed of 555 circuit
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