gapratedistance

Gap rate distance metric

Since R2023a

Syntax

gapratedistance(via,frequency)

gapratedistance(___,criticalwavelength)

Description

gapratedistance(via,frequency) 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 [1].

gapratedistance(___,criticalwavelength) calculates the gap rate distance using the critical wavelength specified.

Examples

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

Input Arguments

via — Single-ended via

viaSingleEnded object

Single-ended via, specified as a viaSingleEnded object.

frequency — Frequency to calculate gap rate distance

vector

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.

References

[1] Steinberger, Telian, Tsuk, Iyer and Yanamadala, “Proper Ground Via Placement for 40+ Gbps Signaling”, DesignCon 2022, April 2022.

[2] Ramo, Whinnery and Van Duzer, Fields and Waves in Communications Electronics, third edition, section 9.3, John Wiley and Sons Inc., copyright 1994

Version History

Introduced in R2023a