{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9654122","patent":{"patent_number":"US-9654122","title":"Dither-less multi-stage noise shaping fractional-N frequency synthesizer systems and methods","assignee":null,"inventors":[],"filing_date":"2016-08-17T00:00:00.000Z","publication_date":"2017-05-16T00:00:00.000Z","cpc_codes":["H04B","H04L","H04B","H04L","H04L"],"num_claims":20,"abstract":"A fractional-N divider of a frequency synthesizer is driven by a dither-less and seed-less multi-stage noise shaping (MASH) modulator to alleviate fractional spurious tones introduced by the cyclic train of division ratios from delta-sigma modulators. The MASH modulator includes at least two cascaded dither-less delta-sigma modulators where each modulator includes a first feedback loop the generates the modulator feedback signal, a second feedback loop that disrupts fractional spurious tones and a third feedback loop that provides approximately zero static error. The MASH modulator further includes a combining circuit delays at least one code sequence from at least one of the delta-sigma modulators and that combines the code sequence generated by each of the delta-sigma modulators and at least one delayed code sequence."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Dither-less multi-stage noise shaping fractional-N frequency synthesizer systems and methods","description":"A fractional-N divider of a frequency synthesizer is driven by a dither-less and seed-less multi-stage noise shaping (MASH) modulator to alleviate fractional spurious tones introduced by the cyclic tr","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9654122","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-9654122","citation_suggestion":"Patentable. \"Dither-less multi-stage noise shaping fractional-N frequency synthesizer systems and methods\" (US-9654122). https://patentable.app/patents/US-9654122","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9654122","json":"https://patentable.app/api/llm-context/US-9654122","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T12:26:14.605Z"}