Electronic transfers

Video SerDes Tech improves resolution over longer single wire

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The uncompressed transmission of video data, control signals and power is intensifying, and not just with the promise of warmer weather. A wide range of applications, from endoscopy, a non-surgical procedure used to examine a person’s digestive tract, to factory automation, require high-bandwidth data to be transferred over several meters of cable.

This presents a challenge, not only due to the signal loss introduced with such a transmission channel, but also due to the introduction of electromagnetic interference (EMI) or electromagnetic compatibility (EMC) considerations common to medical applications. or industrial. Such external noise sources could interfere with the cable as the data travels to its destination.

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Fortunately, there is an important reason why using a single wire over longer distances may soon become very common: the V3Binding of high-speed two-way video serialization/deserialization (SerDes) technology.

Increasing the resolution of an imager in a system increases the amount of data it generates, data that must be transmitted, processed, and stored. Unfortunately, connecting an imager over a small diameter wire or cable can add signal interference. Here we will discuss a modern solution to this problem: V3Link SerDes pairs, which can improve resolution and reduce system size in high-speed video applications.

What is V3Link?

V3Bonding technology acts as a bridge between protocol-based data interfaces, which require multiple signaling conductors to transfer high-bandwidth data. Supported data interface standards include HDMI, LVDS, MIPI CSI-2, and MIPI DSI. These standards, however, are designed to transfer video only over short distances, which may include PCB traces.

V3Link devices support different cable types. Applications typically use coaxial or twisted-pair cables to transport information between the serializer and deserializer. Coaxial cables tend to have lower insertion loss characteristics than twisted pair cables due to their electromagnetic construction. Twisted pair cables are generally more immune to the effects of electromagnetic interference. Most V3Bonding devices can support coaxial or twisted pair configurations to provide flexibility in various applications.

V3Link forwarding works by combining input data into packets or frames to be transmitted serially at high speed. The payload data makes up the majority of the frame. This is the high-bandwidth portion of the data, which can consist of video pixel information, audio data, or other data types including radar, LiDAR, and more.

Minimum latency

Vision-based control systems such as industrial mobile robots require very low latency for real-time acquisition and analysis of video data. Low latency is also required to transfer control information in the reverse direction to change camera position. The V3The link transfer channel is used to send serialized video, audio, or other data to an end device with minimal latency.

Using a proprietary echo cancellation technique, V3Link SerDes enables full-duplex communication over a physical conductor. When the high-speed data is transferred from the serializer to the deserializer in the forward direction, the low-speed data is also transferred to the serializer simultaneously and without time division multiplexing. The V3Link devices automatically establish this two-way channel by continuously canceling their own transmit signals at each end of the link.

Using this simultaneous back channel communication, I have2C access and GPIO transfer can be enabled in forward or reverse direction. V3Link deserializers use several equalization techniques to recover high-frequency signal content and mitigate the effects of intersymbol interference (ISI), reflections, or the influence of external noise.

SerDes technology like the V3The TSER953 Link Serializer and TDES960 and TDES954 Deserializers work in tandem to transfer high-resolution video, control signals, and power simultaneously over a single thin wire. These devices help bridge the gaps between sensors and processors to bring together clock, uncompressed video, control, power, and GPIO signals. (see picture).

In addition to facilitating the transfer of video data, control signals and power over a single cable, V3The link devices include adaptive equalizer technology that can compensate for up to 21 dB loss at 2.1 GHz, allowing the use of very thin 28 to 32 wire American Gauge (AWG) cables. The higher the AWG number, the thinner the cable and the higher the signal loss. The ability to transfer power and control signals over the same thin cable also minimizes the number of conductors.

With a typical power dissipation of 250 mW on the sensor side, V3Link serializers consume very little power. As a result, the sensor and serializers can be integrated into very compact areas without the need for power and heat dissipation, which requires additional space.

Conclusion

V³Link is a high-speed, two-way video SerDes technology that enables uncompressed transmission of video data, control signals, and power over a single wire. As a high-speed, uncompressed video transport technology, V3Link aggregates video, clock, control, and peripheral data from cameras, radar, LiDAR, or time-of-flight sensors to a SoC over a single wire or cable up to 15m. V3Link serializers and deserializers extend cable reach while maintaining image quality, reducing power consumption, and improving system reliability.

Overall, vision-based designs can use V3Pair devices with:

  • Strengthen signal integrity.
  • Extend the cable range up to 15 meters.
  • Reduce system size, weight and power.

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