Dry goods popular science | Quartz crystal resonator parameter introduction

Refers to the frequency specified in the crystal component specification, that is, the ideal operating frequency desired by the user in circuit design and component purchase.

Maximum allowable deviation of the operating frequency from the nominal frequency at the reference temperature.

Quality factor, also known as mechanical Q value, is an important parameter that reflects the performance of the resonator. The larger the R1, the lower the Q value, the greater the power dissipation, and it will also lead to frequency instability. On the contrary, the higher the Q value, the more stable the frequency.

It refers to the equivalent resistance of the crystal element at the resonant frequency, which is approximately equal to the so-called dynamic resistance R1 or equivalent series resistance (ESR) of the crystal, regardless of the effect of C0.
This parameter controls the quality factor of the crystal element and also determines the oscillation level of the crystal in the applied circuit, thus affecting the stability of the crystal and whether it can be vibrated ideally.
Therefore, it is an important index parameter of crystal components. Generally, for a given frequency, the smaller the crystal box selected, the higher the average ESR may be;
In most cases, it is not possible to predict the resistance value of a specific crystal element during the manufacturing process, but only to ensure that the resistance will be lower than the maximum value given in the specification.

Refers to the resistance of the crystal element in series with a specified external capacitor at the load resonant frequency FL. For a given crystal element, the load resonant resistance depends on the load capacitance value working with the element, and the resonant resistance after the load capacitance is connected in series is always greater than the resonant resistance of the crystal element itself.

Inductance in the dynamic arm of an equivalent circuit. Dynamic inductance and dynamic capacitance are a pair of related quantities.

Refers to the frequency drift due to time under specified conditions. This indicator is necessary for precision crystals, but it "does not have clear test conditions, but is continuously supervised by the manufacturer through planned sampling of all products. Some crystal elements may be worse than the specified level, which is allowed" (according to the IEC announcement). The best solution to the problem of aging can only be found through close consultation between the manufacturer and the user.

Drive level dependence. The degree of change in resistance and frequency of a crystal oscillator under different driving powers. This value can reflect the stability and reliability of the crystal oscillator.

Drive level, also known as drive level, refers to the power consumption of the crystal resonator when the oscillation circuit is working. In order to ensure the normal operation of the crystal resonator, it must be kept within the specified range. Excessive drive level may cause unexpected changes in the frequency or ESR of the crystal, which may affect the performance of the circuit

Load capacitance sensitivity, also called traction value. Indicates the amount of change in the crystal resonance frequency as the load capacitance changes. The unit is ppm/pF. Generally, the smaller the load capacitance, the larger the TS value. On the contrary, the larger the load capacitance, the smaller the TS value.

总结

Suzhou Hangjing Electronic Technology Co., Ltd. was established in 2014, focusing on the research and development, design, production and sales of quartz frequency control components. It is a technology small and medium-sized enterprise integrating research, production and sales.
Through professional team combination and advanced production technology, we have established a complete product line of quartz crystals, crystal oscillators, crystal filters, temperature compensation and voltage control products.
In the piezoelectric crystal industry, the technology and quality of Hangjing Electronics are in a leading position.
The product application range covers mobile phones, tablet computers, satellite communications, in-vehicle systems, Global Positioning Systems, personal computers, wireless communications and household products, etc., playing the basic signal source generation, transmission, filtering and other functions.
Continuously committed to technological research and development and quality implementation, it has established operations in Hong Kong, Taiwan, Beijing, Shenzhen, Chengdu, Shanghai, Hangzhou, Suzhou and other parts of the world. Enable Hangjing to provide services to the world's electronics manufacturers!