{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-11265499","patent":{"patent_number":"US-11265499","title":"Reduction of fixed-pattern noise in digital image sensors by mitigating gain mismatch error","assignee":null,"inventors":[],"filing_date":"2020-03-04T00:00:00.000Z","publication_date":"2022-03-01T00:00:00.000Z","cpc_codes":["H04N","H04N"],"num_claims":20,"abstract":"Techniques are described for error-modulated pixel readout by column-parallel programmable gain amplifiers (PGAs) in a digital image sensor. Each PGA has an amplifier with gain set by a ratio of input and feedback capacitors. Mismatch between these capacitors can manifest as vertical fixed pattern noise (FPN) in the image output. Embodiments use a swap control signal to pseudo-randomly toggle between two or more swap states for each of a sequence of row scan times. Each swap state at least directs coupling of a particular capacitor network in either the input or the feedback path of the amplifier. Pseudo-randomly swapping those couplings of the capacitive networks also pseudo-randomly modulates gain error from capacitive mismatch between the capacitor networks. The FPN effectively becomes spatially modulated noise at a level far below what would be considered as a visible artifact in the image output."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Reduction of fixed-pattern noise in digital image sensors by mitigating gain mismatch error","description":"Techniques are described for error-modulated pixel readout by column-parallel programmable gain amplifiers (PGAs) in a digital image sensor. Each PGA has an amplifier with gain set by a ratio of input","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-11265499","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-11265499","citation_suggestion":"Patentable. \"Reduction of fixed-pattern noise in digital image sensors by mitigating gain mismatch error\" (US-11265499). https://patentable.app/patents/US-11265499","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-11265499","json":"https://patentable.app/api/llm-context/US-11265499","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-30T09:16:47.914Z"}