PCB Microstrip Crosstalk Calculator
This calculator estimates the crosstalk between parallel microstrip traces on a PCB using spacing and height parameters. It outputs the result in decibels (dB) to assess signal interference in high-speed circuit designs.
Microstrip Crosstalk in Decibels Estimator
Crosstalk Attenuation Formula (dB)
Where:
- $$h$$ = height of trace above ground plane (mm)
- $$s$$ = spacing between the adjacent traces (mm)
This formula provides a simplified estimate of coupling attenuation between two microstrip traces assuming uniform dielectric and ideal PCB geometry.
PCB Microstrip Crosstalk – Calculation Example
Given:
- $$h$$ = 0.3 mm
- $$s$$ = 1.5 mm
Calculation:
- $$\frac{h}{s} = \frac{0.3}{1.5} = 0.2$$
- $$\text{Crosstalk} = -20 \cdot \log_{10}(0.2) ≈ -20 \cdot (-0.699) ≈ 13.98~\text{dB}$$
Crosstalk in PCB design can compromise signal integrity, especially in high-speed buses like USB, HDMI, or DDR. This calculator gives a quick estimation of the coupling level between traces, helping engineers optimize trace spacing and placement. While simplified, this method provides immediate insight into layout decisions without full simulation tools.