RFIC Layout Analysis Using Sonnet EM with ... - Sonnet Software

Subsection typeFor EM analysis of RFIC inductors,Sonnet’s new conformal meshingcapability is very useful, because itenables significant memory andsimulation time reductions for curvedand diagonal polygons. Please refer tothe Sonnet User's Guide for moreinformation about conformal meshing.You can enable conformal meshing perpolygon, but you can also do Edit>Select All and then change allpolygons at once: Modify > Metalproperties > Fill Type.Add portsOnce the EM Project geometry(including vias) is complete andmaterial properties are defined, theremaining step is to define ports. InSonnet, different port types exist, butthe most common port type is the boxwall port. Box walls are well suited forinductor analysis because we can easilyand accurately de-embed the feed lineup to the desired reference plane.Calibration error for box wall ports inSonnet have been shown to exhibitnumerical noise errors than better than100 dB down or more.To define a box wall port, you mustextend each feed line to a box wall.You can do so by adding a newpolygon, or by stretching an existingpolygon. One easy method to stretch:use the Tools > Reshape commandand drag a window around the edgethat you want to stretch. Then, use theModify > Snap to... command tosnap the edge to one of the box walls.To define a box wall port, use theTools > Add Port command and clickon the polygon edge where the feedline touches the box wall. This adds abox wall port at that location, with thepositive terminal connected to the feedline and the negative terminalconnected to the box (ground).7