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A programmable crystal oscillator is a device that changes its output frequency through digital control. It consists of two main parts: a crystal and a resonant cavity. When voltage is applied, the quartz crystal vibrates and emits an electrical signal. After the signal is detected and digitized, it is demodulated by a processor and finally outputs the desired frequency signal. Phase-Locked Loop (PLL) technology plays a key role in programmable crystal oscillators. The following is a detailed explanation of phase-locked loop technology in programmable crystal oscillators:
1、Basic principles of phase-locked loop technology
1. A phase-locked loop is a negative feedback control system that uses the voltage generated by phase synchronization to tune a voltage-controlled oscillator (VCO) to generate a target frequency. Based on the principle of automatic control, it uses an external input reference signal to control the frequency and phase of the oscillation signal inside the loop, and realizes the automatic tracking of the output signal frequency to the input signal frequency.
2. The phase-locked loop usually consists of a phase detector (PD), a filter (LF) and a voltage-controlled oscillator to form a forward path, and a frequency divider to form a frequency phase feedback path. The working principle of the phase-locked loop is to detect the phase difference between the input signal and the output signal, and convert the detected phase difference signal into a voltage signal output through the phase detector, and form a control voltage of the voltage-controlled oscillator after filtering by a low-pass filter, and control the frequency of the oscillator output signal. Then, the frequency and phase of the oscillator output signal are fed back to the phase detector through the feedback path.
3. During the operation of the phase-locked loop, when the frequency of the output signal proportionally reflects the frequency of the input signal, the output voltage and the input voltage maintain a fixed phase difference, so that the phase of the output voltage and the input voltage is locked.
2、Application of phase-locked loop technology in programmable crystal oscillators
1. Improved frequency stability: Phase-locked loop technology can further reduce the frequency deviation of the programmable crystal oscillator and improve the frequency stability of the system by comparing with a high-stability reference signal.
2. Adjustable frequency: By adjusting the control input of the phase-locked loop, the output frequency of the programmable crystal oscillator can be precisely controlled to adapt it to different working modes or communication standards.
3. Phase synchronization: In the communication system, the phase-locked loop is used to ensure that the clock signals at the sending and receiving ends are phase-synchronized, thereby ensuring the accuracy of data transmission. This is particularly important for the application of programmable crystal oscillators in the field of communications.
4. Noise suppression: The phase-locked loop helps to suppress the phase noise and frequency noise of the programmable crystal oscillator through the feedback mechanism, improving the overall performance of the system.
3、Advantages of phase-locked loop technology
1. High precision: Phase-locked loop technology can provide high-precision frequency output to meet the strict requirements of modern electronic systems for frequency accuracy.
2. Flexibility: By adjusting the parameters of the phase-locked loop, the output frequency can be flexibly changed to adapt to different application scenarios.
3. Stability: Phase-locked loop technology can maintain the stability of the output frequency through the negative feedback control mechanism, and is not affected by external interference.
4、Application and advantages of phase-locked loop technology in Yangxing Technology's crystal oscillator
1. Programmability:
Yangxing Technology's programmable crystal oscillator uses phase-locked loop technology to achieve arbitrary programming and customization of core parameters. This means that customers can choose any frequency point for customization within a wide frequency range of 1MHz~2100MHz (accurate to six decimal places) according to specific needs.
This feature enables Yangxing Technology's programmable crystal oscillator to meet richer and more special requirements, providing customers with more customization options.
2. High performance:
The use of phase-locked loop technology enables Yangxing Technology's crystal oscillator products to have excellent performance such as high precision, high stability, and low jitter.
For example, Yangxing Technology's programmable crystal oscillator has ultra-high precision of ±2.5PPM (min.) and ultra-low jitter of 150fs (min.), as well as an ultra-wide temperature range of -40~+125℃ (max.).
These performance advantages enable Yangxing Technology's crystal oscillator products to maintain stable performance output in various harsh environments.
3. Fast delivery and flexible supply:
Yangxing Technology has an advanced production and supply chain management system that can quickly respond to customer needs and achieve fast delivery. Samples can be produced in 2 seconds, and batches can be delivered in as fast as one week, which shortens the delivery time by at least 50% compared with traditional processes.This ability of fast delivery and flexible supply enables Yangxing Technology to better meet customers' urgent needs and market changes. Yangxing Technology has a certain degree of leadership and innovation in the application of phase-locked loop technology. The application of this technology has brought significant advantages such as programmability, high performance, fast delivery and flexible supply to Yangxing Technology's crystal oscillator products.
