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High Frequency Impedance Control PCB

High Frequency Impedance Control PCB

High frequency impedance control PCB 1.product describe Specification High frequency impedance control PCB Layer: 2 Thickness: 1.6 + / - 0.1 mm Size: 108.82 mm * 88.56 mm Used board: FR4. Minimum aperture: 0.3mm. Surface treatment: gold-plated. Special technology: impedance control Uniwell has...

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High frequency impedance control PCB

1.Product describe


High frequency impedance control PCB

Layer: 2
Thickness: 1.6 + / - 0.1 mm
Size: 108.82 mm * 88.56 mm
Used board: FR4.
Minimum aperture: 0.3mm.
Surface treatment: gold-plated.
Special technology: impedance control
Uniwell has rich experience in Impedance controlled PCB manufacturing,
100% match customer’s requirement with high quality.

2.Introduction of Uniwell
1)Uniwell found in 2007, Intech is one of the Professional PCB manufacturer from Shenzhen of China, which have two branches SHENZHEN UNIWELL CIRCUITS CO., LTD. and Jiangmen UNIWELL CIRCUITS CO., LTD.
2)met the highest international manufacturing standards by being approved for these quality certificates: ISO9001, ISO14001, TS16949. We are UL certified for single sided, double sided and multilayer PCB production, and adhere to all of the requirements for IPC and ROHS standards.
3)40% of our sales are oversea sales and export to Europe,United sates and Asian.
4)Most of our boards are used for EMS,industrial,power,medical and other products. 

3.Uniwell advantages: 

1)We do PCB from double side up to 40-layer Multilayer PCB, HDI jobs. 

2)If you have repeat orders from other suppliers, and you want to transfer to Uniwell, we will offer the best price. 

3)Except excellent quality and professional service, we also pay every detail for our customers, for example package to use Desiccant packs & moisture indicator in vacuum-sealed pack to protect PCB. 

4)Material: We have  FR4 TG135/TG158/TG180normal material in stock, also have CEM3/ ROGERS/ ARLON/ ISOLA 

5)Rigid / flex/ flex-rigid PCBs with UL approved. 

6)Flexible,quickly feedback for customers always. 

7)Quickly offer will be less then 4 hours, Some top urgent inquiry we can offer within 1hour.



5.Packaging & delivery
Packing as standard:


We usually ship by DHL, FEDEX, UPS, TNT, also we can ship by clients' requirements.


6.Little knowledge--- Controlled impedance 

What is impedance?
Impedance is the combination of the capacitance and inductance of a circuit when operated at high frequency. Though also measured in Ohms, it is somewhat different than resistance which is a DC characteristic. Impedance is an AC characteristic, meaning that it is related to frequency, resistance is not.  

What is controlled impedance?
Unless you have carefully designed the trace and its environment, impedance is typically "uncontrolled", meaning that impedance will vary in value from point to point along the trace.  
At high frequencies, PCB traces do not behave like simple connections, controlled impedance helps us ensure that signals are not degraded as they route around a PCB.
Essentially, controlled impedance is the matching of substrate material properties with trace dimensions and locations to ensure the impedance of a trace's signal is within a certain percentage of a specific value. Controlled impedance boards provide repeatable high frequency performance.

When to use controlled impedance
When a signal must have a particular impedance in order to function properly, controlled impedance should be used. In high frequency applications matching the impedance of PCB traces is important in maintaining data integrity and signal clarity. If the impedance of the PCB trace connecting two components does not match the components' characteristic impedance, there may be increased switching times within the device or the circuit. There may also be random errors.

What determines controlled impedance?
The characteristic impedance of a PCB trace is typically determined by its inductive and capacitive reactance, resistance, and conductance. These factors are a function of the physical dimensions of the trace, the dielectric constant of the PCB substrate material, and dielectric thickness. Typically PCB trace impedance can range from 25 to 125 ohms. The impedance value generated from the PCB structure will be determined by the following factors:
– width and thickness of the copper signal trace (top and bottom)
– thickness of the core or prepreg material on either side of the copper trace
– dielectric constant of the core and prepreg material
– distance from other copper features

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