Even if it could, the process would takea long time, and the results would be inconsistent. Further, spiral inductors cost less than chip inductors andrequire a less complex manufacturing process, making themeasier to manufacture with low yield loss.Ī multilayer inductor creates mutual inductance, however,so 3-D-magnetic-simulation software cannot simulatea multilayer inductor. Three options exist for designing largeplanar spiral inductors on a PCB: Increasethe number of turns increase theinner diameter, D IN or add layers andincrease the coupling between multilayers.The first two options occupy morearea on the PCB, so the third option isthe best way to accommodate a large inductorwhen there is limited PCB area.Multilayer planar spiral inductors offerseveral advantages over other inductors.They have stable inductance, for example,and, if the PCB has a fixed layout,their inductance tolerance is less than2%. Some formulas are availablefor calculating the spiral inductor for RF-IC applicationswith inductance of less than 100 nH on a single-layer design.For the application of HPNA (HomePhoneline Networking Alliance) or RF-telecomdesigns, which need inductancesof more than 10 μH, no published paperor report accurately calculates spiral inductorswith a large value in multiplelayers. Accuracy in designinga spiral inductor is important because it isdifficult to modify the inductor once you havebuilt it on the PCB. Planar spiral inductors are less expensive than eitherchip or coil inductors for PCB (printed-circuit-board)-based designs.
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