{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8478221","patent":{"patent_number":"US-8478221","title":"Method and apparatus for efficient DC calibration in a direct-conversion system with variable DC gain","assignee":null,"inventors":[],"filing_date":"2012-06-06T00:00:00.000Z","publication_date":"2013-07-02T00:00:00.000Z","cpc_codes":["H04B","H04B"],"num_claims":20,"abstract":"A wireless communication receiver includes a multitude of look-up tables each storing a multitude of DC offset values associated with the gains of an amplification stage disposed in the wireless communication receiver. The entries for each look-up table are estimated during a stage of the calibration phase. During such a calibration stage, for each selected gain of an amplification stage, a search logic estimates a current DC offset number and compares it to a previous DC offset estimate that is fed back to the search logic. If the difference between the current and previous estimates is less than a predefined threshold value, the current estimate is treated as being associated with the DC offset of the selected gain of the amplification stage and is stored in the look-up table. This process is repeated for each selected gain of each amplification stage of interest until the look-up tables are populated."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Method and apparatus for efficient DC calibration in a direct-conversion system with variable DC gain","description":"A wireless communication receiver includes a multitude of look-up tables each storing a multitude of DC offset values associated with the gains of an amplification stage disposed in the wireless commu","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8478221","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-8478221","citation_suggestion":"Patentable. \"Method and apparatus for efficient DC calibration in a direct-conversion system with variable DC gain\" (US-8478221). https://patentable.app/patents/US-8478221","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8478221","json":"https://patentable.app/api/llm-context/US-8478221","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-31T04:23:58.908Z"}