Verifying the automotive SerDes (serializer / deserializer) channel or link requires looking at the cabling system, the medium-dependent interface (MDI), and the fixturing in both time and frequency domains. Maintaining the signal integrity between the transmitter and receiver is essential for automotive SerDes channel testing. A link segment comprises cables, inline connectors, and mating connectors at either end. Given the cable lengths used in the harsh automotive environment, monitoring the impedance versus frequency data is crucial to predict how the channel will perform within the vehicle.
The main instrument required for automotive SerDes channel testing is a vector network analyzer (VNA). The VNA characterizes the properties of the signal as it moves, ensuring the channel maintains the integrity of the signal transmitted and received. The test setup must include a software application to configure / run the VNA and analyze the measured results by comparing them to the limits published in the specifications. Measurements needed include insertion loss, crosstalk, and mode conversion.
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