High-Speed Signal Design Essentials: Differential Transmission and Miniature Coaxial Bundles

In daily use of electronic products, you may often hear the concept of "differential signal." Simply put, differential signal is a common high-speed signal transmission method: two wires transmit signals with the same amplitude and opposite phase at the same time. The receiving end restores the original data by comparing the difference between the two. The advantage of this method is that external noise usually acts on both lines simultaneously, while the differential receiver only focuses on the difference between the two, thus significantly reducing the impact of interference on the signal. This is why differential transmission is widely used in high-speed interfaces such as USB, HDMI, MIPI, and so on.

The core points of differential transmission
To ensure the best performance of differential transmission, the key is to maintain the "electrical consistency" of the two wires, including as much symmetry as possible in length, impedance, and wiring methods. If there is asymmetry, it may cause signal distortion, increased error rate, and even instability in transmitting high-speed data. Therefore, whether it is PCB design or cable selection, maintaining the consistency of differential pairs is the foundation for stable transmission of high-speed signals.

Why choose ultra-fine coaxial cable束
In compact devices such as mobile camera modules, tablet displays, and robot joint sensors, conventional FPC or twisted pair cables often struggle to meet the three major requirements of "high frequency, anti-interference, and small space" simultaneously. This is where ultra-thin coaxial cable assemblies (micro coaxial cable) demonstrate their advantages: they come with a built-in metal shielding layer, effectively reducing crosstalk and external interference; they have better impedance consistency, allowing for strict parameter control during the manufacturing process, making them suitable for high-speed differential signals; their diameter is extremely small, typically only 0.3mm to 0.5mm, making them suitable for narrow space layouts; and they have strong transmission capabilities, supporting high-speed data links up to GHz levels. It is for this reason that ultra-thin coaxial cable assemblies are increasingly widely used in consumer electronics, medical imaging, and industrial automation fields.

Typical application scenarios
In practical applications, the combination of differential transmission with extremely thin coaxial cables can significantly improve signal stability: In image sensors, MIPI differential transmission ensures clear and high-speed images; Medical imaging equipment has extremely high requirements for low error rates and signal stability; In automation equipment such as robot joint sensors and motion control modules, high-speed differential signals are also relied upon to achieve accurate communication and control.

Differential transmission is a core means to ensure the stability of high-speed signals, and extremely thin coaxial cable bundles are the ideal medium for this method. In the pursuit of thinning and high-speed modern electronic devices, the combination of these two is gradually becoming an industry trend, providing a reliable guarantee for high-speed data transmission.
I am[Suzhou Hui Cheng Yuan]Long-term focus on the design and customization of high-speed signal cable harnesses and extremely fine coaxial cable harnesses, committed to providing stable and reliable high-speed interconnect solutions. If you have any related needs or want to learn more, please contact:Manager Zhang 18913228573 (WeChat same number)。