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Application of crystal oscillator in AR/VR

2024-12-06

Crystal oscillators play an important role in AR/VR devices, providing a stable clock signal for their core electronic systems to ensure high-performance operation of the device. The following are the specific roles of crystal oscillators in AR/VR applications:

Image processing and synchronization

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1、The crystal oscillator provides accurate clock signals for graphics processing units (GPUs) and display chips, supporting high-speed image rendering and refresh rates, reducing latency and picture tearing.

2、Support high refresh rate (e.g. 90Hz, 120Hz) and low latency to improve user experience.

Positioning and tracking system

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In motion tracking devices such as IMU sensors in AR/VR, crystal oscillators provide high-precision clock signals to ensure the stability and real-time performance of the positioning system.

Wireless communication module

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Supports Wi-Fi, Bluetooth, and 5G communication, providing high stable frequencies to meet low latency and high bandwidth requirements in wireless transmission.

Audio signal processing

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In the 3D audio processing module of AR/VR, crystal oscillators help keep the audio signal in sync with the visual effects for an immersive experience.

Edge computing support

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High-performance crystal oscillators (e.g. TCXO, OCXO) provide devices with temperature drift resistance and high-precision frequency support, ensuring the computing stability of AR/VR in complex environments.

晶振在AR/VR设备中通过提供高稳定性、高精度的时钟信号，支撑了设备在视觉、音频、通信和定位等核心模块的功能，是实现沉浸式体验的基础组件之一。

使用频率

In AR/VR devices, the commonly used crystal frequencies vary depending on the application scenario. The following are the main frequencies used:

32.768 kHz

Used in real-time clock (RTC) modules to provide low-power time reference.

16 MHz 和 19.2 MHz

It is suitable for the main control processor, Bluetooth and Wi-Fi communication modules, and supports the operation of the basic functions of the device.

26 MHz 和 40 MHz

It is commonly used in high-performance communication chips (e.g. 5G) and precision sensors to provide support for positioning and real-time data processing.

48 MHz 到 100 MHz

Clock support for high-performance graphics processing units (GPUs) and display driver chips to meet high refresh rate and low latency requirements

High-precision crystal oscillators (TCXO/OCXO) such as 10 MHz and 20 MHz

It is used for modules that require high stability, such as inertial navigation systems and audio-video synchronization modules in headsets.

The crystal selection of AR/VR requires comprehensive consideration of performance, power consumption, and stability to meet the operating requirements of the device.