In the modern automotive industry, as the complexity of electronic systems increases, electromagnetic interference (EMI) issues have become increasingly evident. EMI poses a common challenge to electric vehicles, hybrid vehicles, and traditional internal combustion engine vehicles, as the densification of electronic devices and circuits within vehicles raises the demand for high sensitivity in high-speed signal environments.
To address this challenge, engineers must plan how to significantly reduce the impact of EMI from the early stages of design. The increase in switching frequency in power supply design, while meeting product performance requirements, exacerbates EMI issues. Additionally, clock signals, wiring design, and shielding effects are key factors in EMI problems. According to international electromagnetic compatibility (EMC) standards, devices must not only suppress the electromagnetic interference they generate but also have a certain level of interference resistance.
Strategies to reduce EMI effects include shielding, filtering, isolation, the use of ferrite rings, signal edge control, and adding power and ground layers in PCB design. Each method has its applicable scenarios and limitations. For example, shielding is effective but costly, while filtering and signal edge control have limited effectiveness in high-speed signal environments.
Aiming at the clock signal, a major source of EMI, the spread spectrum crystal oscillator (SSXO) offers an effective solution. This type of oscillator uses spread spectrum technology to disperse energy over a wider frequency range through frequency modulation, effectively reducing spikes and harmonics, thereby reducing EMI.
The advantage of spread spectrum crystal oscillators lies in their systematic EMI improvement effect. All clock and timing signals generated by the spread spectrum crystal oscillator are modulated in the same proportion, achieving a reduction in EMI across the entire system. Epson's 9101 series programmable crystal oscillators, with their small size, low power consumption, high stability, and good frequency characteristics, have become an ideal choice for automotive electronic devices. The SG-9101CGA model of the crystal oscillator, with a 2.5x2.0mm package, has a frequency range from 0.67MHz to 170MHz, a step precision up to 1ppm, standard CMOS output, a maximum output load of 15pF, and a working temperature up to 125°C. It complies with RoHS standards and AEC-Q100 certification, providing an efficient solution to the EMI problems of automotive electronic systems.
According to the latest research data, the adoption of spread spectrum crystal oscillator technology can reduce the EMI level of automotive electronic systems by about 30%, significantly enhancing the EMC characteristics of the system. At the same time, the application of this technology also helps to shorten the product development cycle, reduce production costs, and accelerate product launch. With the continuous advancement of automotive electronic technology, spread spectrum crystal oscillators are expected to play an increasingly important role in the field of EMI suppression.
About Mandu Technology
Shenzhen Mandu Technology Co., Ltd. has steadfastly centered its operations on the distribution of high-performance, high-quality, and highly reliable integrated circuit products. Its portfolio encompasses memory chips, differential crystal oscillators, and MCU microcontrollers, while progressively integrating analog signal chain products. The company prides itself on delivering comprehensive and cost-effective solutions to its customers. Its products find applications across a broad spectrum of industries, including but not limited to network communication, industrial control, robotics, medical equipment, personal health, and numerous other fields.
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