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SnpExpert: S-Parameter Exploration

S-parameters, traditionally used in RF/Microwave design, are widely adopted by high speed digital designs as the multi-gigabit interface continues to advance to higher data rate. Xpeedic SnpExpert provides a quick way to understand the electrical characteristics of the passive interconnectors in a system by not only viewing the S-parameter in frequency domain but also examining the time domain reflectometry (TDR). One-click definition of differential pairs and victim/aggressor setup, together with the built-in NEXT, FEXT, PSXT, ILD, ICR, and ICN, allows user to quickly evaluate the crosstalk. The built-in delay and skew calculator requires no cumbersome circuit schematic setup. The built-in compliance metrics with IEEE 802.3ap, 802.3ba, 802.3bj, SAS, PCIe, SATA and OIF CEI 25G/28G standards quickly reveal the S-parameter compliance. The built-in passivity, causality, reciprocity, and stability metrics tell the quality of the S-parameter, and built-in enforcement algorithm fix S-parameter quality issues. The built-in template automates the process from S-parameter plotting to report in Word or PPT. The through-only de-embedding method helps SI engineers to quickly obtain the DUT characteristics by removing the fixture effect. Accurate NRZ and PAM-4 eye diagram calculation with equalization and pre-emphasis technology help user get an intuition feeling about high speed channel performance.

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