The full name of Crystal is also called the Crystalz oscillator. It is like the heart of the human body. It is sacred and beautiful and plays a vital part.
The role of the crystal oscillator is to provide the system with a basic clock signal. Usually a system uses a crystal to facilitate the synchronization of the parts. Some communication systems use different crystals for the fundamental frequency and radio frequency, and they keep pace by adjusting the frequency electronically.
The following is the introduction of crystal technology in the circuit for you in Imperial Science and Technology. Crystal generally uses the three-terminal capacitor (Cabitex) AC equivalent oscillator circuit shown in Figure 1a; the actual crystal oscillator AC equivalent circuit is shown in Figure 1b, where Cv is Used to adjust the oscillation frequency, generally using a varactor diode with a different reverse bias voltage to achieve, which is also known as the pressure control for the analysis of the entire tank circuit, the use of Cv to change the frequency is limited: the entire tank capacitance to determine the oscillation frequency After three capacitors C=Cbe, Cce, and Cv are connected in series with Co, they are connected in series with C1. It can be seen that the smaller C1 is, the larger Co is, and the smaller the effect of Cv on the capacitance of the entire tank circuit is. Therefore, the frequency range of "voltage control" is also smaller. In fact, because C1 is small (1E-15 scale), Co cannot be ignored (1E-12 magnitude, a few PF). Therefore, when Cv becomes larger, the effect of reducing the channel frequency becomes smaller and smaller, and when Cv becomes smaller, the effect of increasing the channel frequency becomes larger and larger. On the one hand, this results in nonlinearity in the voltage control characteristics. The larger the voltage control range, the greater the nonlinearity.
On the other hand, the feedback voltage that distributes the oscillation (the voltage on Cbe) is getting smaller and smaller, eventually resulting in stoppage of vibration. Through the schematic of the crystal oscillator, you should have a general understanding of the role of the crystal oscillator and the working process. Using a crystal with a higher number of harmonics, the equivalent capacitance C1 is smaller; therefore, the frequency variation range is smaller. Even if the quartz crystal can play a stable start-up characteristic under extremely harsh environmental conditions, the product itself has excellent heat resistance, vibration resistance, impact resistance and other environmental resistance characteristics, to meet the lead-free soldering and high temperature reflow temperature curve requirements, in full compliance with AEC -Q200 standard.
The role of the crystal oscillator is to provide the system with a basic clock signal. Usually a system uses a crystal to facilitate the synchronization of the parts. Some communication systems use different crystals for the fundamental frequency and radio frequency, and they keep pace by adjusting the frequency electronically.
The following is the introduction of crystal technology in the circuit for you in Imperial Science and Technology. Crystal generally uses the three-terminal capacitor (Cabitex) AC equivalent oscillator circuit shown in Figure 1a; the actual crystal oscillator AC equivalent circuit is shown in Figure 1b, where Cv is Used to adjust the oscillation frequency, generally using a varactor diode with a different reverse bias voltage to achieve, which is also known as the pressure control for the analysis of the entire tank circuit, the use of Cv to change the frequency is limited: the entire tank capacitance to determine the oscillation frequency After three capacitors C=Cbe, Cce, and Cv are connected in series with Co, they are connected in series with C1. It can be seen that the smaller C1 is, the larger Co is, and the smaller the effect of Cv on the capacitance of the entire tank circuit is. Therefore, the frequency range of "voltage control" is also smaller. In fact, because C1 is small (1E-15 scale), Co cannot be ignored (1E-12 magnitude, a few PF). Therefore, when Cv becomes larger, the effect of reducing the channel frequency becomes smaller and smaller, and when Cv becomes smaller, the effect of increasing the channel frequency becomes larger and larger. On the one hand, this results in nonlinearity in the voltage control characteristics. The larger the voltage control range, the greater the nonlinearity.
On the other hand, the feedback voltage that distributes the oscillation (the voltage on Cbe) is getting smaller and smaller, eventually resulting in stoppage of vibration. Through the schematic of the crystal oscillator, you should have a general understanding of the role of the crystal oscillator and the working process. Using a crystal with a higher number of harmonics, the equivalent capacitance C1 is smaller; therefore, the frequency variation range is smaller. Even if the quartz crystal can play a stable start-up characteristic under extremely harsh environmental conditions, the product itself has excellent heat resistance, vibration resistance, impact resistance and other environmental resistance characteristics, to meet the lead-free soldering and high temperature reflow temperature curve requirements, in full compliance with AEC -Q200 standard.
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