The crystal oscillator 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.
Imperial Technology is a large-scale quartz crystal vibration production enterprise with a certain scale in China. The company provided professional OEM services to the national military industrial enterprises in the early days, supplying quartz crystal oscillators, 49/S, 49/U, 49/SSMD, 6035mm, 5032mm, 3225mm cylindrical crystal oscillator series.
The products are all environmentally friendly and comply with EU standards. The products include quartz crystal resonator, quartz crystal oscillator, patch crystal oscillator, cylindrical crystal oscillator and SMD crystal oscillator series. If necessary, call us! The following is the product map of the company, please enjoy! .
The role of the crystal is to provide the system with a basic clock signal. Usually a system shares a crystal to keep the parts in sync. Some communication systems use different crystals for the fundamental and RF frequencies, and are synchronized by electronically adjusting the frequency. .
The following is the technology of Imperial Technology to introduce you to the crystal oscillator in the circuit. Crystal Crystal generally adopts the capacitor three-terminal (Cobitz) AC equivalent oscillation circuit as shown in Figure 1a; the actual crystal oscillator AC equivalent circuit is shown in Figure 1b, where Cv It is used to adjust the oscillation frequency. It is usually realized by varactor diodes plus different reverse bias voltages. This is also the pressure control for analyzing the entire oscillation tank. It is known that the frequency is limited by Cv: the entire tank path that determines the oscillation frequency. Capacitor C=Cbe, Cce, Cv Three capacitors are connected in series, and Co is connected in parallel with C1. It can be seen that the smaller C1 is, the larger Co is, and the smaller the effect of Cv on the entire tank capacitance. Therefore, the frequency range in which "voltage control" can be made is smaller. In fact, since C1 is small (on the order of 1E-15), Co cannot be ignored (1E-12 magnitude, a few PF). Therefore, when Cv becomes larger, the effect of lowering the frequency of the channel is getting smaller and smaller, and when Cv becomes smaller, the effect of increasing the frequency of the channel is getting larger and larger. This aspect causes nonlinearity of the voltage control characteristics. The larger the voltage control range, the more nonlinear the nonlinearity is.
On the other hand, the feedback voltage (the voltage on the Cbe) that is distributed to the oscillation is getting smaller and smaller, and finally causes the vibration to stop. Through the schematic diagram of the crystal oscillator, you should have a general understanding of the role of the crystal oscillator and the working process. The crystal oscillator with a higher harmonic order has a smaller equivalent capacitance C1; therefore, the frequency variation range is smaller. Even if the quartz crystal can exert stable vibration characteristics under extremely harsh environmental conditions, the product itself has excellent environmental resistance such as heat resistance, vibration resistance and impact resistance, meeting the requirements of lead-free soldering and high temperature reflow temperature curve, and fully conforms to AEC. -Q200 standard.
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