Contact Sales & After-Sales Service

Contact & Quotation

  • Inquire: Call 0086-755-23203480, or reach out via the form below/your sales contact to discuss our design, manufacturing, and assembly capabilities.
  • Quote: Email your PCB files to Sales@pcbsync.com (Preferred for large files) or submit online. We will contact you promptly. Please ensure your email is correct.
Drag & Drop Files, Choose Files to Upload You can upload up to 3 files.

Notes:
For PCB fabrication, we require PCB design file in Gerber RS-274X format (most preferred), *.PCB/DDB (Protel, inform your program version) format or *.BRD (Eagle) format. For PCB assembly, we require PCB design file in above mentioned format, drilling file and BOM. Click to download BOM template To avoid file missing, please include all files into one folder and compress it into .zip or .rar format.

Crosstalk Estimator | PCBsync
PCB Signal Integrity Tool

Crosstalk Estimator

Calculate near-end (NEXT) and far-end (FEXT) crosstalk for coupled transmission lines in PCB designs

Coupled Line Parameters

Define aggressor and victim trace geometry

Trace Geometry
mm
mm
mm
mm
mm
Trace Geometry
mm
mm
mm
mm
mm
Signal Parameters
ns
V
%

Crosstalk Types

  • NEXT (Near-End): Appears at the near end of victim, due to capacitive + inductive coupling
  • FEXT (Far-End): Appears at the far end of victim, due to capacitive − inductive coupling
  • Rule of Thumb: Keep S ≥ 3×H (microstrip) or S ≥ 2×W (stripline) for <3% crosstalk

Crosstalk Analysis Results

Near-end and far-end coupling coefficients

Near-End Crosstalk (NEXT) Check
-- %
-- dB
Kb: --
Voltage: -- mV
Far-End Crosstalk (FEXT) Pass
-- %
-- dB
Kf: --
Voltage: -- mV

Crosstalk Magnitude Comparison

NEXT (Near-End) --%
FEXT (Far-End) --%
Target Maximum 5%
0%5%10%15%20%
Coupling Coefficient
--
Odd-Mode Z₀
-- Ω
Even-Mode Z₀
-- Ω
Critical Length
-- mm
Saturation Length
-- mm
S/H Ratio
--

Microstrip Coupled Lines

Ground Plane Aggressor Victim S H Coupling

Design Rules Check

3H Rule (S ≥ 3×H)
Spacing meets minimum requirement
Crosstalk Target
Within acceptable limits
NEXT Saturation
Check coupled length vs saturation

Crosstalk Calculation Formulas

Near-End Crosstalk (NEXT)

NEXT = Kb × (1 - e^(-2L/Lsat)) Kb = (Zeven - Zodd) / (4 × (Zeven + Zodd))

Kb is backward crosstalk coefficient. NEXT saturates at coupled length = Lsat = Tr × v / 2

Far-End Crosstalk (FEXT)

FEXT = Kf × L / Tr Kf ≈ 0 for stripline (homogeneous) FEXT increases linearly with length

In homogeneous media (stripline), Kf ≈ 0 due to equal velocities.

Coupling Coefficient

k = (Zeven - Zodd) / (Zeven + Zodd) Target: k < 0.1 for low crosstalk

Coupling coefficient k ranges from 0 (no coupling) to 1 (maximum coupling).

Spacing Guidelines

Microstrip: S ≥ 3×H for < 3% NEXT Stripline: S ≥ 2×W for < 3% NEXT NEXT ∝ 1/(S/H)² (approx)

Increasing spacing is the most effective way to reduce crosstalk.

© 2024 PCBsync.com — Professional PCB Design Tools

Contact Sales & After-Sales Service

Contact & Quotation

  • Inquire: Call 0086-755-23203480, or reach out via the form below/your sales contact to discuss our design, manufacturing, and assembly capabilities.

  • Quote: Email your PCB files to Sales@pcbsync.com (Preferred for large files) or submit online. We will contact you promptly. Please ensure your email is correct.

Drag & Drop Files, Choose Files to Upload You can upload up to 3 files.

Notes:
For PCB fabrication, we require PCB design file in Gerber RS-274X format (most preferred), *.PCB/DDB (Protel, inform your program version) format or *.BRD (Eagle) format. For PCB assembly, we require PCB design file in above mentioned format, drilling file and BOM. Click to download BOM template To avoid file missing, please include all files into one folder and compress it into .zip or .rar format.