{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9735753","patent":{"patent_number":"US-9735753","title":"Baluns for RF signal conversion and impedance matching","assignee":null,"inventors":[],"filing_date":"2016-01-21T00:00:00.000Z","publication_date":"2017-08-15T00:00:00.000Z","cpc_codes":["H01L","H01L","H01L","H01L","H01L"],"num_claims":4,"abstract":"A magnetically-coupled structure is integrated with an integrated circuit in back end-of-line (BEOL) digital CMOS fabrication processes. A differential primary (or secondary) coil is formed by patterning a thick copper (Cu) metal layer, and a single-ended secondary (or primary) coil is formed by patterning a thick aluminum (Al) top metal bonding layer. Crossovers and/or cross-unders are formed using thin metal layers. One embodiment provides a stacked balun with a differential primary input winding defined in the copper layer, directly underneath a single-ended spiral winding defined in the aluminum layer. The spiral forms the single-ended secondary output of the balun and is rotated by 90° to prevent metal shorting for its cross-under connections. Another embodiment provides a transformer with one differential primary (or secondary) coil defined in the copper layer and another differential secondary (or primary) coil defined in the aluminum layer and adding a center tap. The position of the tap is selected to compensate for phase differences and provide desired balance."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Baluns for RF signal conversion and impedance matching","description":"A magnetically-coupled structure is integrated with an integrated circuit in back end-of-line (BEOL) digital CMOS fabrication processes. A differential primary (or secondary) coil is formed by pattern","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9735753","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-9735753","citation_suggestion":"Patentable. \"Baluns for RF signal conversion and impedance matching\" (US-9735753). https://patentable.app/patents/US-9735753","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9735753","json":"https://patentable.app/api/llm-context/US-9735753","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T06:59:10.124Z"}