What is the purpose of PHASE and ORIGIN?
The PHASE of a structure represents the direction of current flow from segment to segment. (The “ShowPhase” command shows the direction of current flow in Version 10.20.99 and up.) This can be significant when more than one structure is present and one wishes to examine the magnetic coupling from one structure to the other. For instance, in a transformer this phase plays an important role. Furthermore, when joining spirals in series make sure that the structures have the correct PHASE. For instance, if M > 0 for two spirals and you join them in series, you expect the inductance to increase to L1+L2+2*M. But if the phase is wrong, you will get L1+L2-2*M. The ORIGIN command is used to place structures relative to the chip origin. Even with only one spiral is present, the ORIGIN can be important. Do not abut structures to the chip boundaries as the boundary conditions at the chip boundaries do not allow fields to penetrate the ‘walls’ of the boundary. Always use a chip-size larger than th
