What is a Crystal Oscillator? An Introduction to the Basic Knowledge of Crystal Oscillators

Feb. 04, 2026

Every standalone chip system contains a component called a crystal oscillator. So what exactly is a crystal oscillator? How much do you know about it? This article will provide an introduction.

1. What is a crystal oscillator?

A crystal oscillator primarily refers to a quartz crystal oscillator. This component consists of a thin slice cut from a quartz crystal at specific orientations, commonly known as a chip, and serves as the most critical element in clock circuits. The quartz crystal resonator, abbreviated as quartz crystal or simply crystal, is a component that integrates an IC within its package to form an oscillation circuit.

2. What is the working principle of a crystal oscillator?

A crystal resonator is a resonant device primarily fabricated using the piezoelectric effect of quartz crystals. When an electric field is applied across the quartz crystal's electrodes, mechanical deformation occurs. Conversely, mechanical pressure applied to the crystal's sides generates an electric field in the corresponding direction—a phenomenon known as the piezoelectric effect. When alternating voltage is applied to the crystal's electrodes, mechanical vibrations are induced, which in turn produce an alternating electric field.

Under normal conditions, the amplitude of mechanical vibrations in a wafer and the alternating electric field are extremely small. However, when the frequency of the applied alternating voltage reaches a specific threshold, the amplitude increases significantly, far exceeding that at other frequencies. This phenomenon is known as piezoelectric resonance, which closely resembles the resonance behavior of an LC circuit. The resonant frequency depends on factors such as the wafer's cutting method, geometric shape, and dimensions.

III. What are the functions of crystal oscillators?

1. Provide basic clock signals

Typically, a system shares a single crystal oscillator to ensure synchronization across all components. For example, in some communication systems, the baseband and radio frequency operate on separate oscillators, with electronic frequency adjustment maintaining synchronization.

2. Provide the system's required clock frequency

Crystal oscillators are typically paired with phase-locked loop (PLL) circuits to deliver the system's required clock frequency. When different subsystems require distinct clock frequencies, multiple PLLs connected to the same crystal oscillator can be employed to meet these needs.

Previous: What are the working principles of the metro clock system?

Next: What is a crystal oscillator? What are its functions?

Zhejiang Saisi Electronics focuses on the research and production of PCI-e timing cards, providing nanosecond level timing boards that support multi-source timing such as PTP/IEE1588 and IRIG-B, and are suitable for high-precision time synchronization scenarios in servers, industrial computers, and data centers.

Feb 04, 2026

What Special Advantages Do Atomic Clocks Have Over Crystal Oscillators?

Secondly, atomic clocks exhibit excellent stability. When crystal oscillators are subjected to external influences such as vibration and electromagnetic interference, their oscillation frequency is prone to changes, thereby affecting the accuracy of time measurement. Thanks to their working principle, atomic clocks have a high resistance to such ex

Feb 04, 2026

How to Choose and Use an Oven-Controlled Crystal Oscillator (OCXO)

An Oven-Controlled Crystal Oscillator (OCXO), also known as an oven-controlled oscillator, is an electronic component designed to provide a stable and highly accurate frequency. In electronic devices, OCXOs are widely used in clocks, timers, computer motherboards, communication equipment, and various other applications. They play a crucial role in

Feb 04, 2026

The Introduction of the Advantages of Clock Buffer and Clock Generator

With the rapid advancement of electronic technology, clock signals have become increasingly vital in digital circuit design. As two essential components for maintaining stable clock signals, clock buffers and clock generators each possess distinct characteristics and advantages. This article will delve into the unique strengths of these two devices

Feb 04, 2026

The important role of clock system in the monitoring system

In today's digital and information-driven era, surveillance systems are omnipresent, functioning as the "eyes" of cities to safeguard public safety and order. As a critical component of these systems, the clock system plays an indispensable role by providing precise and stable time benchmarks. This ensures the effective operation of surveillance sy

Feb 04, 2026

How to Select a Suitable Clock Generator

In the field of precision electronic design, clock generators play a pivotal role. Like the heart of a system, they provide stable timing and accurate time references for digital systems. Whether in communication equipment, computer hardware, or embedded systems, high-quality clock signals are critical to ensuring performance and reliability. This

Feb 04, 2026

Time synchronization of rail transit: The Saisi mother clock system ensures the safety and punctuality of train operation

Zhejiang Saisi Electronics provides a time synchronization solution for rail transit, with a professional slave clock system adapted to urban rail transit scenarios, achieving unified timing of equipment throughout the line, and ensuring stable and on-time train operation.

Feb 04, 2026

What is a crystal oscillator? What are its functions?

OCXO (Optical Crystal Oscillator) operates through a crystal that converts electrical energy into mechanical energy and vice versa, functioning in resonance to deliver stable, precise single-frequency oscillation. Under standard operating conditions, conventional OCXO systems achieve absolute frequency accuracy of 50 parts per million (ppm), with a

Feb 04, 2026

Atomic Clock Time Calibration: The Excellence of Precision and Stability

In this era of extremely high precision requirements, time accuracy is as crucial as a cornerstone in various fields such as satellite navigation, financial transactions, communication networks, and scientific research. Atomic clock time calibration, with its unique advantages, is gradually becoming the key method to ensure precise timing across

Feb 04, 2026

How Crystal Oscillator work

In electronic devices, oscillators are a crucial component that generates stable frequency signals and is widely used in communication, timing control, timing systems, etc. Among them, the Crystal Oscillator has become one of the most commonly used oscillators in electronic devices due to its high stability and precision.

Feb 04, 2026