March 2007 [Components] Multilayer Baluns Break Size Barrier Impedance transformers are one of the necessities of high-frequency design. Unfortunately, when miniaturization is an issue, the wire-wound ferrite components that represent traditional impedance transformers pose three major design challenges. For one thing, the dome-shaped ferrite core is not well suited for high-volume pick-and-place manufacturing equipment and must be used with a plastic cap. For another, the height constraints of modern commercial designs, such as... November 2005 [Components] Baluns Shrink To Tiny 0404 Footprint Consumer and commercial electronic designs call for the smallest possible-components to save space and power. Balanced-unbalanced transformers or baluns have traditionally been based on transmission lines, such as coaxial wires, stripline, or microstrip, and often somewhat large as a result. By applying their multilayer techniques, Anaren Microwave had already succeeded in developing baluns in 0805 (0.08 × 0.05 in.) and 0603 (0.06 × 0.03 in.) package sizes. And to meet the... |
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