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Article: When good passives go bad.(embedded passives update)
- Article from:
- CircuiTree
- Article date:
- November 1, 2006
- Author:
CopyrightCOPYRIGHT 2006 BNP Media. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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It seems like Mother Nature gave us just the right number of passives. We have one whose impedance goes up with frequency, one that goes down, and one that stays the same. Ideally, a given passive would be a pure component. For instance, a resistor would show only resistance without any hint of capacitance or inductance over the entire frequency range of interest. But any real passive--discrete or embedded--always has some amount of the other two, often referred to as "parasitics." For discretes, these are set properties that are listed in the part's specifications. But, due to the less complex planar nature for embedded passives, we can easily see where some of these ...