Skip to main content
Sierra Circuits
Best-in-Class PCB Fabrication, Assembly, & Components.
Industry Leading PCB Designer's Tools.

Speak to an Account Manager Telephone +1 (800) 763-7503

Quote Now

Controlled Impedance for High-Frequency PCBs

Sierra Circuits can deliver your PCBs with -/+ 5% impedance tolerance. We manufacture and assemble high-frequency PCBs without signal distortion.

Start a Custom Quote
Product image 1: Controlled Impedance

Impedance control helps you maintain data integrity and signal clarity.

Whether you’re early in the PCB design process or troubleshooting an assembly problem, Sierra Circuits is here to help.

Sierra Circuits can:

  • Help you with your controlled impedance stack-up
  • Route your single-ended and differential pair traces
  • Place your components, vias, coupling capacitors
  • Adjust the length matching to achieve propagation delay
  • Calculate the effective dielectric constant
  • Deliver -/+ 5% impedance tolerance

Start a Custom Quote

Product Promise

Sierra Circuits has developed a toolkit to help you optimize costs to preserve signal integrity through controlled impedance.


Stackup Designer

Get precise options for cost-optimized stack-up structures! Our Stackup Designer has an integrated Impedance Calculator to get desired impedance and trace/space values on any signal layer.

Impedance Calculator

Calculate your trace widths, single-ended or differential impedances – for both microstrip and stripline models – and other parameters such as the dielectric height, the dielectric constant, and the trace thickness.

Materials Selector

Search and compare properties and specs for 60+ board materials to fit your application. Get specs for dielectric constant, dissipation factor, glass transition temperature, decomposition temperature, moisture absorption, and more.


Why Controlled Impedance is Important

Every day, PCB designs and components become smaller, faster – in other words, more complicated. It is now crucial to slow certain circuits down in order to allow specific functions of components to perform before others. The time of simple interconnecting traces and conductors is over.

Typically, you will need controlled impedance for PCBs used in high-speed digital applications, such as RF communication, telecommunications, computing using signal frequencies above 100 MHz, high-speed signal processing, high-quality analog video, etc.

At high-frequency signals, the signal traces on a PCB act like transmission lines, which have an impedance at each point on the signal trace trajectory. If this impedance varies from one point to the next one, there will be a signal reflection whose magnitude will depend on the difference between the two impedances. The larger the difference is, the greater the reflection will be. This reflection will travel in the opposite direction of the signal, which means that the reflected signal will superimpose on the main signal.

As a result, the original signal will be distorted: the signal intended to be sent from the transmitter side would have changed once it gets to the receiver side. The distortion may be so much that the signal may not be able to perform the desired function. Therefore, to have an undistorted signal travel, it is essential that the PCB signal traces have a uniform controlled impedance to minimize signal distortions caused by reflections. This is the first step to improve the integrity of the signals on the PCB traces.

Trusted by innovators

Engineers at the world’s most innovative companies choose Sierra Circuits to wrangle the impedance issues on their prototypes, right here in the USA.

Start a Custom Quote and Get to Market Faster

Product Image 2: Controlled Impedance

Need help wrangling signal distortion away from your PCBs? 

Bring your high-frequency circuits to life.

The time of simple interconnecting traces and conductors is over. With high-speed PCBs, it is crucial to slow certain circuits down to allow specific functions of components to perform before others.

Impedance control is required for high-speed PCBs used in:

  • Digital applications, such as RF communication and telecommunications
  • Computing, using signal frequencies above 100MHz
  • High-speed signal processing
  • High-quality analog video such as DDR, HDMI, Gigabit Ethernet

Sierra Circuits engineers will help you efficiently design and manufacture your boards with industry-leading impedance tolerances.

Start a Custom Quote

Sierra Circuits is headquartered in Silicon Valley.  We welcome visitors at our 70,000 sqft facility,  located at 1108 West Evelyn Avenue in Sunnyvale, California. Book a tour with an account manager today! Let us introduce you to one of the most innovative communities of engineers and designers in the world. We can help you plan your project from design to assembled board.

Manufacturing Equipment at Sierra Circuits

Our 70,000 sqft state-of-the-art campus in the heart of Silicon Valley contains the most advanced equipment required for the manufacture and assembly of your PCBs. Whether you're looking for standard quick turn PCBs or boards with the tightest tolerances, made from exotic metals, there's a reason Sierra Circuits leads the industry in quality and performance.

PCBs manufactured and assembled in the United States

Get started with Controlled Impedance

Let us help you get control of your signal distortion with controlled impedance. Upload your data and receive a free consultation and review of your design today.

Start a Custom Quote

Talk to a Sierra Circuits PCB Expert today

24 hours a day, 7 days a week.

Call us: +1 (800) 763-7503
Email us: through our Customer Care form