Gap rate distance metric
calculates the maximum center-to-center (c2c) distance between the signal via
and its nearest ground return via required to stay within a specified critical
wavelength up to a specified maximum frequency. This metric is defined in mils.
The consequences of exceeding a specified gap rate distance is described in
Gap Rate Distance of Single-Ended Via
Calculate the gap rate distance of a single-ended via at 20 GHz and a critical wavelength of 0.3.
obj = viaSingleEnded; freq = 20e9; cw_desired = 0.3; gapratedistance(obj,freq,cw_desired)
ans = 80.8086
via — Single-ended via
Single-ended via, specified as a
frequency — Frequency to calculate gap rate distance
Frequency to calculate gap rate distance in hertz, specified as a vector.
criticalwavelength — Number of wavelengths between signal via and ground return vias
0.25 (default) | scalar
Number of wavelengths between signal via and ground return vias at a given frequency, specified as a scalar. This metric analyzes the resonant responses in the structure.
 Steinberger, Telian, Tsuk, Iyer and Yanamadala, “Proper Ground Via Placement for 40+ Gbps Signaling”, DesignCon 2022, April 2022.
 Ramo, Whinnery and Van Duzer, Fields and Waves in Communications Electronics, third edition, section 9.3, John Wiley and Sons Inc., copyright 1994
Introduced in R2023a