Analysing S-parameters

TDR, mixed-mode pairs, crosstalk, passivity and reciprocity from any FDTD or cascade result.

agentee sparam NAME (MCP sparam) works on any FDTD or cascade result:

agentee sparam lna-rf --tdr IN --rise 50ps     # impedance against time from one port
agentee sparam link --pair 1,2,3,4             # Sdd21, Sdd11, Scc21, Scd21, Sdc21
agentee sparam link --xtalk 1,3                # coupling in dB and the step crosstalk

It always reports passivity (the largest singular value of S over the band) and reciprocity (the largest |Sij - Sji|) when every port was driven. The TDR resamples onto a uniform grid, extrapolates the real part to DC, applies a Gaussian edge (default 10-90% rise of 1.3 / the top frequency) and integrates the impulse response; it warns when the edge is faster than the data supports. The viewer shows the same TDR for every driven port under the tdr tab.