BICHENG ENTERPRISE LIMITED

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Impedance Controlled PCB

Customer Reviews
Kevin, Received and tested the boards - thanks very much. These are perfect, exactly what we needed. rgds Rich

—— Rich Rickett

Ruth, I got the PCB today, and they are just perfect. Please stay a little patience, my next order is coming soon. Kind regards from Hamburg Olaf

—— Olaf Kühnhold

Hi Natalie. It was perfect, I attach some pictures for your reference. And I send you next 2 projects to budget. Thanks a lot again

—— Seba T.

Kevin, Thanks, they were perfectly made, and work well. As promised, here are the links for my latest project, using the PCBs you manufactured for me:

—— Daniel F

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Impedance Controlled PCB

  • High Precision Impedance Controlled PCB suppliers
  • High Precision Impedance Controlled PCB suppliers
  • High Precision Impedance Controlled PCB suppliers
  • High Precision Impedance Controlled PCB suppliers
  • High Precision Impedance Controlled PCB suppliers

General Profile

Without impedance control, significant signal reflections and signal distortions will occur, resulting in design failure. Impedance control is required for common signals, such as PCI bus, PCI-E bus, USB, Ethernet, DDR memory, LVDS signals, etc. Impedance control eventually needs to be achieved by PCB design and a higher requirement for PCB board process is also put forward too. So we need to control the impedance of wiring as per the signal integrity requirement.

 

Definition of characteristic impedance

At a certain frequency, relative to a reference layer, the resistance of its high-frequency signals or electromagnetic waves in the process of transmission is called the characteristic impedance, which is the vector summation of electrical impedance, inductive reactance, capacitance resistance.

 

Basic elements that affect impedance

1) Thickness of trace (T1) 7%

2) Width of trace (W1) 4%

3) Height of laminate (H1) 35%

4) Dielectric constant of board material (Er1) 8%

5) Other factors can be involved, however they have much less affect on the impedance such solder resist, thickness of tin and lead, PCB humidity etc

 

Main factors affected impedance control (normally ±10%)

1) Generally, designed width of trace is already fixed, manufacturing procedure is controlled within ±15-20%

2) Generally, the thickness of trace is already fixed at designing period, manufacturing procedure of electroplate is controlled within ±0.8-1.2mil

3) The dielectric constant of the substrate is almost fixed, no much big changes.

4) The above-mentioned factors can be controlled stably, the main affecting factor of impedance control is only left height of laminate.

 

Main factors to the height of laminate

1) Thickness of inner layer copper

2) Residual rate of inner layer copper

3) Use which kind of prepreg

 

The classification of characteristic impedance

Common characteristic impedance is divided into: single ended (line) impedance, differential impedance, coplanar impedance, etc.

 

Single ended impedance: refers to the measured impedance of a single signal line.

Differential impedance: refers to the impedance measured between the two transmission lines with equivalent width and spacing in differential drive.

 

Coplanar impedance: refers to the impedance measured when the signal line is transmitting between its surrounding GND / VCC (the space between the signal line to GND / VCC on both sides is equal).

 

Testing the PCB

PCB testing is normally done on one test coupon integrated into the PCB panel, not on the PCB itself. Coupons are designed for specific time domain reflectometer.

 


 

 

Impedance Controlled PCB

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Good Quality 10 Layer PCB Built On Tg170 FR-4 With Differential Pairs Impedance Controlled Suppliers

10 Layer PCB Built On Tg170 FR-4 With Differential Pairs Impedance Controlled

Product profile 1.1 General description This is a type of multilayer PCB built on FR-4 substrate with Tg 170C for the application of Spread Spectrum.It has minimum trace/space of 4/4 mils and minium holes size ... Read More
2018-11-05 10:11:43
Good Quality 6 Layer PCB Built On High Tg FR-4 With 57 Ohm Impedance On Layer 3 and Layer 4 Suppliers

6 Layer PCB Built On High Tg FR-4 With 57 Ohm Impedance On Layer 3 and Layer 4

Product profile 1.1 General description This is a type of single end impedance controlled PCB built on FR-4 substrate with Tg 150C for the application of vehicle tracking system. As request, it's panelized 12 ... Read More
2018-10-29 10:21:11
Good Quality Impedance controlled PCB Built On Tg170 FR-4 With 4 Layers Copper For Frequency Generator Suppliers

Impedance controlled PCB Built On Tg170 FR-4 With 4 Layers Copper For Frequency Generator

Product profile 1.1 General description This is a type of impedance controlled PCB built on FR-4 substrate with Tg 170C for the application of Frequency Generator. It's 1.6 mm thick with 4 layers copper, white ... Read More
2018-09-10 10:11:10
Good Quality Impedance Controlled PCB Built On RO4003C With Immersion Gold Suppliers

Impedance Controlled PCB Built On RO4003C With Immersion Gold

General Profile Impedance controlled PCB's are used more and more popular in our common life: Synchronous digital hierarchy (SDH), GSM, CDMA, PC and high power wireless phone etc. Basic elements that affect ... Read More
2018-06-28 10:16:17
Good Quality Impedance Controlled PCB Built On RO4350B With Selective Hard Gold Suppliers

Impedance Controlled PCB Built On RO4350B With Selective Hard Gold

General Profile Impedance controlled PCB's are used more and more popular in our common life: Synchronous digital hierarchy (SDH), GSM, CDMA, PC and high power wireless phone etc. Basic elements that affect ... Read More
2018-06-28 10:11:21
Good Quality Impedance Controlled PCB Built On High Tg FR-4 With Single End Impedance Suppliers

Impedance Controlled PCB Built On High Tg FR-4 With Single End Impedance

General Profile Impedance controlled PCB's are used more and more popular in our common life: Synchronous digital hierarchy (SDH), GSM, CDMA, PC and high power wireless phone etc. Basic elements that affect ... Read More
2018-06-28 10:06:44
Good Quality Impedance Controlled PCB Built On High Tg FR-4 With RoHS Compliance Suppliers

Impedance Controlled PCB Built On High Tg FR-4 With RoHS Compliance

General Profile Impedance controlled PCB's are used more and more popular in our common life: Synchronous digital hierarchy (SDH), GSM, CDMA, PC and high power wireless phone etc. Basic elements that affect ... Read More
2018-06-28 09:44:43
Good Quality Impedance PCB Built On 4 Layers Copper With Matt Black Mask and Immersion Gold Suppliers

Impedance PCB Built On 4 Layers Copper With Matt Black Mask and Immersion Gold

Product profile 1.1 General description This is a type of 4 layers impedance controlled PCB built on FR-4 substrate with Tg 170C for the application of POS System. 50 ohm coplanar impedance with 15mil track... Read More
2018-06-25 11:58:29
Good Quality Impedance PCB Built On 10 Layer Copper With Via In Pad (VIP) and green soldermask Suppliers

Impedance PCB Built On 10 Layer Copper With Via In Pad (VIP) and green soldermask

Product profile 1.1 General description This is a type of 10 layer PCB circuit board built on FR-4 substrate with Tg 180C for the application of Signal Generator. It's 1.6 mm thick with white silkscreen(Taiyo) ... Read More
2018-06-06 16:14:19
Good Quality Impedance Controlled PCB On 1.6mm FR-4 With 8 Layer Copper and Immersion Gold Suppliers

Impedance Controlled PCB On 1.6mm FR-4 With 8 Layer Copper and Immersion Gold

Product profile 1.1 General description This is a type of 8 layer printed circuit board built on FR-4 substrate with Tg 170C for the application of Wireless HDMI. It's 1.6 mm thick with white silkscreen(Taiyo) ... Read More
2018-06-06 15:06:12
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