Quick Answer
Calculate PCB Stackup Impedance Tolerance Budget Allocator
Calculator
Result Interpretation
PCB Stackup Impedance Tolerance Budget Allocator Calculator computes Impedance Tolerance Budget in ohm using the defined engineering formula and the input values provided.
Worked Example
Verified calculation
Given:
- Via Impedance Variation = 0.3
- Trace Impedance Variation = 0.5
- Solder Impedance Variation = 0.2
- Substrate Impedance Variation = 0.4
Expected Result:
- Impedance Tolerance Budget = 0.73484692283495
Engineering Interpretation:
Under the given input conditions, the calculated result is: Impedance Tolerance Budget = 0.73484692283495 ohm.
The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from automatically validated test cases.
Formula / Method
impedance tolerance budget = sqrt(pow(trace impedance variation, 2) + pow(via impedance variation, 2) + pow(solder impedance variation, 2) + pow(substrate impedance variation, 2))Formula family: formula_pcb_pcb_stackup_impedance_tolerance_budget_allocator
Variables
| Symbol | Label | Role | Description |
|---|---|---|---|
| trace_impedance_variation | Trace Impedance Variation | INPUT | Trace Impedance Variation |
| via_impedance_variation | Via Impedance Variation | INPUT | Via Impedance Variation |
| solder_impedance_variation | Solder Impedance Variation | INPUT | Solder Impedance Variation |
| substrate_impedance_variation | Substrate Impedance Variation | INPUT | Substrate Impedance Variation |
| impedance_tolerance_budget | Impedance Tolerance Budget | OUTPUT | Impedance Tolerance Budget |
Calculation Steps
- Enter the trace impedance variation in ohm.
- Enter the via impedance variation in ohm.
- Enter the solder impedance variation in ohm.
- Enter the substrate impedance variation in ohm.
- Step 1: Compute impedance tolerance budget.
- Read the impedance tolerance budget (ohm) from the results.
Engineering Summary
Calculate PCB Stackup Impedance Tolerance Budget Allocator
Frequently Asked Questions
What does this calculator calculate?
The PCB Stackup Impedance Tolerance Budget Allocator Calculator estimates Impedance Tolerance Budget based on the input parameters you provide
Why is trace impedance variation important in this calculation?
trace impedance variation is directly proportional to impedance tolerance budget. When you enter trace impedance variation in ohm, the calculator uses it in the engineering formula to compute the output
How should I interpret the result impedance tolerance budget?
The calculator outputs impedance tolerance budget in ohm. The result is computed directly from the input values using the defined engineering formula
What units should I use for the inputs?
Enter each value in the units shown next to the input field: Trace Impedance Variation (ohm), Via Impedance Variation (ohm), Solder Impedance Variation (ohm), Substrate Impedance Variation (ohm). Make sure all inputs use the specified units for consistent results
What assumptions does this calculator use?
This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment
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