Well, I'm involved in a personal activity in researching the development of HDI circuitry. And what that means?
HDI stands for High Density Integration (Circuits), better translated as small PCB (Printed Circuit Board) with lots of IC's (Integrated Circuits) and possibly RF (Radio Frequency) use or connection.
As you may think, working with small things is difficult not only because it's hard to find spaces in it, but also because putting somethings close to each other may lead us to disaster (just being bold...). Some of you know that EMI (ElectroMagnetic Interference) is a commonplace these days, as the actual trend in electronics is removing the wires, and send any type of information, or raw data, over the air. But although we can't visualize it, there's a real crowd of "wireless-wires" passing over our heads all the time. And that make the work of circuit dseginers a little harder (as if it weren't enough).
Placing the "wires" in the PCB, or routing, for those familiar with it, has become a matter of life and death for the project design, if you really want it to work in the real-world environment. Not only it may suffer from outside influence, but also from itself, as placing routes to close to each other, or in the same position in different layers may lead to parasite capacity, as any kind of loops can create inductance and fake antennae. These can still be fixed, in some extreme ways, but when it comes choosing the IC's or connections we want to place in the PCB, sometimes we don't have enough room for choice.
I heard from a friend of mine, working in a HDI project that there were no buttons small enough to fit his PCB, and we are talking of 4 x 4 mm! Yeah, milimeters. We almost can't see them, what about actually pushing them?
That's why we are going, in the next steps, to try to show you some knowledge on HDI design with good results. Until them, start looking for EM books, if you enjoy it ;)
HDI stands for High Density Integration (Circuits), better translated as small PCB (Printed Circuit Board) with lots of IC's (Integrated Circuits) and possibly RF (Radio Frequency) use or connection.
As you may think, working with small things is difficult not only because it's hard to find spaces in it, but also because putting somethings close to each other may lead us to disaster (just being bold...). Some of you know that EMI (ElectroMagnetic Interference) is a commonplace these days, as the actual trend in electronics is removing the wires, and send any type of information, or raw data, over the air. But although we can't visualize it, there's a real crowd of "wireless-wires" passing over our heads all the time. And that make the work of circuit dseginers a little harder (as if it weren't enough).
Placing the "wires" in the PCB, or routing, for those familiar with it, has become a matter of life and death for the project design, if you really want it to work in the real-world environment. Not only it may suffer from outside influence, but also from itself, as placing routes to close to each other, or in the same position in different layers may lead to parasite capacity, as any kind of loops can create inductance and fake antennae. These can still be fixed, in some extreme ways, but when it comes choosing the IC's or connections we want to place in the PCB, sometimes we don't have enough room for choice.
I heard from a friend of mine, working in a HDI project that there were no buttons small enough to fit his PCB, and we are talking of 4 x 4 mm! Yeah, milimeters. We almost can't see them, what about actually pushing them?
That's why we are going, in the next steps, to try to show you some knowledge on HDI design with good results. Until them, start looking for EM books, if you enjoy it ;)
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