{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9755677","patent":{"patent_number":"US-9755677","title":"Testing tone free close loop notch frequency calibration for delta-sigma data converters","assignee":null,"inventors":[],"filing_date":"2017-02-15T00:00:00.000Z","publication_date":"2017-09-05T00:00:00.000Z","cpc_codes":["H04B","H04B","H04B","H04B","H04B","H04L","H04B","H04B","H04B"],"num_claims":16,"abstract":"A cellular radio architecture that includes a receiver module having a delta-sigma modulator that converts analog signals to digital signals and a Fast-Fourier transform (FFT) circuit that converts the digital signals to frequency spectrum signals. The architecture also includes a moving average circuit that smoothes out the frequency spectrum signals by applying a moving average to the signals. The architecture further includes a differentiator circuit that differentiates the frequency spectrum signals to make the signals linear, and a minimum finding circuit that converts the differentiated frequency spectrum signals into positive values for frequencies above a notch frequency in the differentiated signals and negative values for frequencies below the notch frequency in the differentiated signals. A transition between the positive and negative values is compared to a desired notch frequency value, and if the difference is greater than a predetermined threshold, an adaptive control circuit calibrates the modulator."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Testing tone free close loop notch frequency calibration for delta-sigma data converters","description":"A cellular radio architecture that includes a receiver module having a delta-sigma modulator that converts analog signals to digital signals and a Fast-Fourier transform (FFT) circuit that converts th","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9755677","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-9755677","citation_suggestion":"Patentable. \"Testing tone free close loop notch frequency calibration for delta-sigma data converters\" (US-9755677). https://patentable.app/patents/US-9755677","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9755677","json":"https://patentable.app/api/llm-context/US-9755677","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T07:15:15.915Z"}