Applications for phase matched cable assembly

Phase matched cable assembly is an emerging solution for high-speed digital signal applications using coaxial cable assembly technology. These applications require precise timing between high-speed protocol transmitter and receiver circuits such as SERDES, USB 3.1, Ethernet and PCIe. Rigorous testing is often required to troubleshoot signal integrity issues in the channel, such as jitter, skew or crosstalk. Given the extended throughput of these latest standards, phase matched cable assemblies and microwave test equipment are more commonly used to test high-speed digital signal devices and boards.

While most precision phase matched cable assemblies with enhanced phase stability may be beneficial for a variety of tests, the skew differences between phase matched cable assemblies may be sufficient to mask signal integrity issues in the channel when dealing with different signalling operations. Tilt matching therefore facilitates the use of flexible phase matched cable assemblies in high speed differential signal applications where short lengths of miniature coaxial cable assemblies or semi-rigid coaxial cable assemblies are preferred. In many high-speed digital signal test scenarios, a large number of differential signal channels must be tested simultaneously, resulting in complex test fixtures and "nesting" of test coaxial cable assemblies. The limited length and inflexibility of these coaxial cable assemblies presents a challenge for the test bench, so flexible phase matched cable assemblies with good signal integrity performance are often preferred.

                                        
In addition, even excellent quality control and precision manufacturing processes will still produce flexible phase matched cable assemblies of almost identical length but tilted to match sequences of picosecond magnitude. tilted matching between coaxial cable assemblies only affects applications that require multi-port testing of wavelengths in the millimetre wave spectrum and use longer lengths of phase matched cable assemblies, and test benches that require coaxial cable assemblies to be bent but need to maintain accuracy between measurements.
It is important to note that each tilt matched phase matched cable assembly must itself be phase stable when installed into the test system in order to provide tilt matched performance.

Therefore, tilt matched phase matched cable assemblies are manufactured using temperature stable dielectrics and design strategies that maintain accurate signal path lengths regardless of the degree of bending. A large number of designs focus on reducing the stress on the coaxial cable assembly and improving the temperature stability of the coaxial cable assembly material in order to achieve phase stability within the specification range. In addition, to achieve inter-channel delay matching between 1 ps and 5 ps, the coaxial cable assembly must be 100% tested to ensure reliable performance.

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