A system and method for forming post passivation metal structures is described. Metal interconnections and high quality electrical components, such as inductors, transformers, capacitors, or resistors are formed on a layer of passivation, or on a thick layer of polymer over a passivation layer....http://www.google.ca/patents/US8018060?utm_source=gb-gplus-sharePatent US8018060 - Post passivation interconnection process and structures
