Multiple coupled inductors are formed in a well in a semiconductor device. The inductors, which preferably are spiral inductors, are strongly coupled with high quality factors. The coupled inductors may be used as efficient signal splitting and combining circuits....http://www.google.es/patents/US6635948?utm_source=gb-gplus-sharePatente US6635948 - Semiconductor device with electrically coupled spiral inductors
Semiconductor device with electrically coupled spiral inductors
