Controlled impedance PCB Manufacture - As PCB signal switching speeds increase today's PCB designer needs to understand and control the impedance of PCB traces. With the short signal transition times and high clock rates of modern digital circuitry Wholesale Lawrence Taylor Jersey , PCB traces need to be considered not as simple connections but as transmission lines.
What is controlled impedance?
Probably the most common example of a controlled impedance component is the download (or feeder) connecting a receiving aerial to a wireless or television set. Aerial feeder leads usually take the form of "flat twin" cable (commonly supplied with VHF broadcast receivers) or low-loss coaxial cable. In both cases the impedance of the feeder is controlled by the physical dimensions and material of the cable.
So why do we need to control impedance?
The receiving aerial possesses natural, or characteristic, impedance and electrical theory shows that for the aerial to transfer maximum power to the set (and to ensure the integrity of the electrical signal) the impedance both of the feeder and the receiver should match that of the aerial. In other words the signal should ideally be presented with a constant impedance as it travels from its source to its destination. Where a mismatch occurs only part of the signal will be transmitted; the rest will be reflected toward the source (this degrades the signal). Cable designers therefore take great care to ensure the accuracy and consistency of the cable dimensions and material characteristics. At high signal switching speeds, the electrical properties of the cable, such as the capacitance and inductance, must be taken into account, and cables can no longer be considered as simple wires. Cables designed for high signal speeds where these factors are taken into consideration are referred to as transmission lines.
Controlled impedance on PCBs
Similarly Wholesale Darian Thompson Jersey , as the speed of signal switching on a PCB increases, the electrical properties of the traces carrying signals between devices become increasingly more important. The impedance of a PCB trace is controlled by its configuration dimensions (trace width and thickness and height of the board material) dielectric constant of the board material.
As with a cable, when the signal encounters a change of impedance arising from a change in material or geometry, part of the signal will be reflected and part transmitted. These reflections are likely to cause aberrations on the signal which may degrade circuit performance (e.g. low gain, noise and random errors). In practice board designers will specify impedance values and tolerances for board traces and rely on the PCB manufacturer to conform to the specification.
Shenzhen Jaapson Technology Co., Ltd, which was founded in 2004 Wholesale Wayne Gallman Jersey , is a high-tech enterprise specializing in designing, developing, manufacturing and marketing of Printed Circuit Board (PCB). We introduced advanced production and test equipment from overseas, professional engineering& management personnel and state-of-art technique to make sure we provide our customers with PCBs of high quality, reasonable price, fast delivery time and timely after-sales.
Through our continuous efforts and improvement, we are able to fully meet customers鈥?requirement for multi-layer Wholesale Landon Collins Jersey , MCPCB, HDI PCB and high frequency PCBs, either for samples or mass production. They are widely used in such fields as telecommunications, medical, power supplies, embedded system, wireless Wholesale Ereck Flowers Jersey , hardware, computers, industrial automation, LED lighting, etc.
We gained great popularity because of our responsibility, effectiveness and quality. We have established good partnership with many famous international companies and have strong customer base in North America, Europe Wholesale Sterling Shepard Jersey , Asia, including sales agents worldwide. Our factories pass ISO9001, ISO14001, and our products meet UL, RoHS standards.
Our Mission: Exceed customers' expectations and offer better PCB Solutions all the time! Jaapson PCB was established in 2004, we have 10 years experience We passed ISO9001, ISO14001 Wholesale Eli Apple Jersey , RoHS certificates 70% of our customers are from Europe and North America We use very good material, such as KB, Shengyi, Rogers, Taiyo solder mask.. 100% of our products are tested and 100% pass We attend dozens of Electronics Fairs in Germany, USA, HK Wholesale Dalvin Tomlinson Jersey , etc Our production line works 24hours without any break, to ensure timely delivery We are golden member of CPCA and SECC.
Total Views: 106Word Count: 661See All articles From Author If you are searching for a tourist attraction that proffers healthiest climate with epic sceneries then Murcia must be your next stopover. A small city in Spain, Murcia is known for its glorious history, gusto food, captivating architecture and warm hospitality. The city is best known for its historical sights and for not being in rush at all. Everything takes time in Murcia so take a slow walk and tour the city while exploring the best of it. If you are heading to Murcia this season with cheap flights then this article is a must if you desire a congenial and a hassle-free tour. Accommodation in Murcia First comes first, when you tour a city or a country, all you require first is to have an arrangement for your living. There are plenty of good hotels from which you can opt the one that suits you the most Wholesale Evan Engram Jersey , depending on your budget and needs. If you are running low at budget and want somewhere comfy and cheap then hotels like Hotel Zenit, Hotel El Churra, Hotel Churra Vistalegre, Hotel Pacoche, Hotel Cetina, Sucina, Hesperia and Hotel Venta Banos will do the job as they endeavor comfortable stay at least fares. For tourists who want to have a sprinkle of luxury while being in budget Wholesale Eli Manning Jersey , they can choose the 4 tar or economic hotels. The best economic hotels in Murcia include Hotel Azarbe, Hotel Nel. Cheap Jerseys ChinaCheap Jerseys Free ShippingCheap Jerseys OnlineCheap NFL JerseysCheap Jerseys China Free ShippingCheap NFL Jerseys WholesaleWholesale Jerseys From ChinaCheap NCAA JerseysCheap Basketball JerseysCheap MLB Baseball Jerseys
Plauderwelten
Thema drucken
26.11.2019 06:49
Antworten
