Signal Rise Time Calculator
Critical length & transmission line analysis
Signal Parameters
Analysis Results
TRANSMISSION LINE
Termination recommended. Use series or parallel termination.
Knee Frequency
350.00 GHz
f = 0.35 / tr
3rd Harmonic
1050.00 GHz
Propagation Velocity
159.2 mm/ns
Critical Length
26.5 mm
1.04"
Flight Time
314 ps
Wavelength @ fKnee
0.5 mm
Length Comparison
Your Trace50.0 mm
188%
of critical length (26.5 mm)
Trace behaves as transmission line when length > critical length (tr × vp / 6)
Common Rise Times
DDR4100-200 ps
PCIe Gen3~100 ps
USB 3.0~200 ps
LVDS~500 ps
CMOS (3.3V)1-2 ns
Key Formulas
fknee = 0.35 / tr
Lcrit = tr × vp / 6
vp = c / √εeff