Controlled Impedance
±5% impedance — verified per panel.
50 Ω single-ended, 90 Ω / 100 Ω differential — simulated in Polar Si9000, validated with TDR coupon test on every build panel. Your stack-up PDF ships before the boards.
- Tolerance
- ±5%
- Si9000
- Polar
- Coupon per panel
- TDR
- Verified
- 100%
Target Impedances
Common controlled-impedance targets
Verification
TDR coupon on every panel
We add an impedance test coupon to every controlled-impedance panel. The coupon is measured on TDR, results logged and shipped with the order.
- Polar Si9000 simulation before fab
- Test coupon added to every panel
- TDR measurement per coupon
- Pass/fail report with every shipment
- Raw TDR data on request
Impedance Control — Capability
Published control targets
| Tolerance | |
| Standard | ±5% |
|---|---|
| Tight (on request) | ±3% (Polar Speedstack only) |
| Target impedances | |
| Single-ended | 50 Ω · 75 Ω · 100 Ω · custom |
| Differential | 90 Ω · 100 Ω · 120 Ω · custom |
| Supported stack-ups | |
| Layer count | 2 – 40 layers |
| Substrate | FR-4 (TG 150/170) · Rogers · Isola · Arlon · hybrid |
| Copper weight | 0.5 – 3 oz |
| Verification | |
| Simulation | Polar Si9000 · Polar Speedstack |
| TDR coupon | Added to every panel · 100% measured |
| Reports | Stack-up PDF + TDR pass/fail log per lot |
Frequently Asked Questions
Impedance control FAQ
01Can you achieve tighter than ±5%?
Yes — ±3% is achievable on select stack-ups using Polar Speedstack optimization. Adds ~3–5 days lead time and a moderate cost uplift.
02Do I need to specify impedance on my Gerber?
Include a ReadMe or impedance table listing: target Z, net names, and reference plane. We’ll simulate and return the stack-up for your approval before cutting copper.
03What simulation tools do you use?
Polar Si9000 is our default. For complex hybrid builds we use Polar Speedstack. Full channel simulation (HyperLynx / ADS) available separately for SI/PI projects.
04What does the stack-up PDF include?
Layer-by-layer dielectric thickness, copper weight, Dk / Df at your target frequency, trace widths for each impedance, and simulated Z₀ with manufacturing tolerance band.
Ready when you are
Send your Gerber & BOM — get a quote in 24 hours.
NDA available · Free DFM review · Senior engineer response.