Start here 1
Estimate trace impedance
Choose single-ended or differential, then microstrip or stripline, before solving impedance, width, or pair spacing.
Open controlled impedance
Calculator hub
PCB signal integrity and timing calculators
Choose the right calculator for controlled impedance, propagation delay, edge-rate bandwidth, wavelength, and first-pass crosstalk checks.
Calculator navigation: Choose the right calculator, follow common design paths, and open supporting pages when the calculation needs engineering context.
Start here
Choose by signal-integrity task
Start from the trace or timing question you need to answer, then follow the calculator and workflow links into solver-backed or measurement checks.
Start here 2
Check timing and length
Use effective Dk (Er), velocity factor, delay per length, and trace length to estimate timing.
Open propagation delay
Start here 3
Screen crosstalk
Use geometry or odd/even impedance data to estimate NEXT and FEXT before layout changes become expensive.
Open crosstalk
Start here 4
Relate edge rate to bandwidth
Estimate signal bandwidth from edge rate before judging electrical length or coupling risk.
Open rise time bandwidth
Calculators
PCB signal integrity calculators
Use these calculators for controlled impedance, timing, wavelength, edge-rate, and crosstalk screening.
Available Tolerance aware
PCB Controlled Impedance Calculator
Estimate single-ended and differential microstrip or stripline impedance from stackup and trace geometry.
Use when: Use before routing controlled-impedance traces or requesting a stackup from the fabricator.
Available
Propagation Delay Calculator
Estimate PCB trace delay, effective Dk (Er), velocity factor, and delay per length.
Use when: Use when timing, skew, electrical length, or trace-length matching matters.
Available
PCB NEXT and FEXT Crosstalk Calculator
Estimate near-end and far-end crosstalk from simple geometry or odd/even-mode impedance data.
Use when: Use after edge rate and coupled routing length make spacing rules worth checking.
Available Tolerance aware
Rise Time Bandwidth Calculator
Convert signal rise time to approximate bandwidth, or bandwidth to rise time.
Use when: Use before deciding whether a trace is electrically short or needs transmission-line treatment.
Available
Frequency Period and Wavelength Converter
Convert frequency, period, velocity, wavelength, and wavelength fractions.
Use when: Use to relate signal frequency and velocity to electrical trace length.
Available
dB Ratio and Percentage Converter
Convert amplitude or power ratios to and from dB with percentage context.
Use when: Use when comparing crosstalk, attenuation, margin, or gain/loss ratios.
Workflows
Common signal-integrity workflows
Use these paths when trace geometry, timing, edge rate, or coupled routing affects the next PCB layout decision.
Workflow
High-speed trace first pass
Start from edge rate, then check wavelength, impedance, delay, and crosstalk.
- 1 Rise time bandwidth Estimate edge bandwidth.
- 2 Controlled impedance Estimate trace or pair geometry.
- 3 Propagation delay Check timing and length.
- 4 Crosstalk Screen coupled routing.
Workflow
Differential pair review
Use width, spacing, stackup, and odd/even estimates before moving to solver or fabricator data.
- 1 Controlled impedance Estimate Zdiff, Zodd, and Zeven.
- 2 Propagation delay Review delay per length.
- 3 Crosstalk Use solver-backed data where available.
Questions
PCB signal integrity hub FAQ
Use these answers to choose the right first-pass calculator and the next verification step.
Does the controlled impedance calculator replace a field solver?
No. It is a first-pass screening calculator. Use the PCB fabricator stackup, solver-backed impedance data, coupons, or measurement for release decisions.
Why are PDN target impedance and trace impedance separate?
PDN target impedance is a power-integrity rail target from voltage droop and transient current. Controlled trace impedance is a signal-integrity transmission-line property from geometry and stackup.
Should I start with rise time or frequency?
For digital edges, rise time is often the better first check because crosstalk and transmission-line behaviour follow edge rate, not just clock frequency.
What this hub does not replace
These calculators support early PCB layout decisions. Real controlled-impedance and high-speed designs still need fabricator stackups, field-solving, discontinuity review, SI simulation, coupons, and measurement before release.
- Check solder mask, copper roughness, etch compensation, glass weave, resin content, and manufacturer impedance tolerance.
- Review vias, pads, connector launches, packages, return-path discontinuities, and layer transitions.
- Keep PDN target impedance in the power-integrity workflow; it is related noise context, not trace characteristic impedance.