Compute PCB impedance stackup by IPC-2141 from dielectric constant.
Key formulas: 87÷√(er+1.41)×Math.log(5.98×h÷(0.8×w+t))
| Item | Formula | Source / Standard |
|---|---|---|
| Z0 | Z0 = sqrt(L/C) | transmission line |
| Microstrip | Z0 ≈ 87/sqrt(er+1.41)·ln(5.98h/(0.8w+t)) | IPC-2141A microstrip |
| Delay | tpd = 85·sqrt(er) ps/inch | IPC-2141A propagation |
PCB阻抗叠层计算工具依据IPC-2141简化公式,根据介电常数、线宽、介质厚度与铜厚,计算微带线的特性阻抗,是高速数字电路与射频PCB阻抗控制的基础工具。