How to Control Impedance
The transmission line’s characteristic impedance depends on how the width of a conductor, the thickness of a conductor, the thickness of the dielectric between the conductor and the ground power reference planes, as well as the dielectric constant of the dielectric medium relate to one another.
During the beginning stage of design, it is suggested that the client contact Bittele Electronics to discuss the impedance requirements. This discussion will provide a platform of communication for all parties to ensure the specifications and effects of material characteristics, including specific DKs and production processes, will have on the project’s impedance requirements and tolerances.
To determine the real impedance may require building a small prototype in order to test it. This is usually required due to the close impedances necessary in a design. It may also be necessary when a design has small line widths and dielectric thicknesses that have greater sensitivity to changes. For instance, a tolerance change from variation in etching have more significance for a 0.125 mm (0.005 inch) line width than for a 0.25 mm (0.100 inch) line.
Document the reference dimensions for line width and dielectric thickness only. This permits Bittele Electronics to make small changes to the line width and dielectric thickness to correspond to impedance goals.
Note: When it is needed to make a modification of a line width, it needs to be done to all of the lines of the same width in a particular layer. The client must give permission to make this type of modification.
Consider the importance of the Etch Factor when making impedance calculations.
The Etch Factor is the resultant reduction of a line width during the etching process. However, it is not necessary to consider the Etch Factor for PCBs that possess an Aspect Ratio GE 4.5:1 or boards that are GE 2.3 mm (0.093 inch) thick and have an Aspect Ratio of GE 3:1.
The suggested tolerance for impedance is +/- 10 percent. A smaller tolerance is usually attainable, particularly with complete embedded micro-strip and strip-line structures. Discuss this specification with Bittele Electronics for the best results.
SMT Reflow Oven, Lead free Reflow Oven, Reflow Oven Manufacturer, LED reflow oven, PCB Reflow Oven, Nitrogen Reflow Oven, Dual Lane Reflow Oven, China Reflow Oven.
|Flason Electronic Co.,ltd provide a full SMT assembly line solutions, including
SMT Reflow Oven Manufacturer,
Wave Soldering Machine,
Pick and Place Machine,
SMT Stencil Printer,
SMT Inspection Machine,
SMT Reflow Oven,
SMT Peripheral Equipment,
SMT Assembly line,
SMT Spare Parts
etc any kind SMT machines you may need, please contact us for more information:
wechat whatsapp:+8613691605420, Skype: flasonsmt, Email: firstname.lastname@example.org
1) This is the first time I use this kind of machine, is it easy to operate?
There is English manual or guide video that show you how to use machine.
If you still have any question, please contact us by e-mail / skype/ phone /trademanager online service.
2) If machine have any problem after I receive it, how can I do ?
Free parts send to you in machine warranty period.
If the part is less than 0.5KG, we pay the postage.
If it exceeds 0.5KG, you need to pay the postage.
3) MOQ ?
1 set machine, mixed order is also welcomed.
4) How can I buy this machine from you? ( Very easy and flexible !)
A. Consult us about this product on line or by e-mail.
B. Negotiate and confirm the final price , shipping , payment methods and other terms.
C. Send you the proforma invoice and confirm your order.
D. Make the payment according to the method put on proforma invoice.
E. We prepare for your order in terms of the proforma invoice after confirming your full payment.
And 100% quality check before shipping.
F.Send your order by air or by sea.
5)Why choose us ?
A. Gold supplier on Alibaba !
B. Trade assurance to US$54,000 !
C. Best price & Best shipping & Best service !