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 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. 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. The 2D RLCG full-wave solver enables quick and accurate transmission line characterization.


Diff Pair Setup

  • Easy differential pair definition
  • Easy selection of the curves to plot

S-parameter and TDR

  • Both frequency domain S-parameter and TDR plot

Grid Plot

  • Grid plot for diff pair S-parameter and TDR in both single-ended and differential modes.

Crosstalk Plot

  • Easy Victim/Aggressor Setup
  • Built-in crosstalk plots including FEXT, NEXT, PSXT, ILD, ICN, and ICR.

Compliance Metric
Built-in Compliance metrics:

  • IEEE 802.3ap (10GBASE-KX4, 10GBASE-KR)
  • IEEE 802.3ba (40GBASE-KR4,40GBASE-CR4)
  • IEEE 802.3bj (100GBASE-CR4,100GBASE-KR4,100GBASE-KP4)
  • OIF2008 (CEI-25G-LR,CEI-28G-SR)

Customized Compliance

S-parameter Quality

  • Built-in passivity, causality, reciprocity and stability metrics.

Delay and Skew Calculator

  • Built-in delay calculator for both single ended trace and differential pair.
  • Built-in skew calculator between two traces in each differential pair.

Template plot: One-click-for-all

Thru-Only Deembedding (TOD)
The TOD technique has comparable accuracy to traditional TRL technique, but is much simpler than TRL.


More Fast to calculate RLGC Report, S-parameter and impedance