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07.12.2019 09:10
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Controlled impedance PCB

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 Al Kaline 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 Alan Trammell Jersey , 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, 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.

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Starting Your Own Home Business

Posted by nick_niesen on October 28th, 2010

Ok, so you have researched the facts, weighed the pros and cons and have finally decided that a home business is right for you. But now you need to figure out what type of business you want and how to proceed with marketing this business.

There are many types of home businesses but not all of them are right for all people. You need to ask yourself these questions: Do I want to start my own business from scratch? Do I just want to join an MLM and sell for someone else? Do I want to sell physical products or digital products? Do I want to do all the work online or offline too? Do I want help with my business or do I want to go solo? Do I just want to become an affiliate and sell other people's online products?

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