{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8487509","patent":{"patent_number":"US-8487509","title":"Drive circuit and physical quantity measuring device","assignee":null,"inventors":[],"filing_date":"2011-08-31T00:00:00.000Z","publication_date":"2013-07-16T00:00:00.000Z","cpc_codes":["G01C","G01D"],"num_claims":10,"abstract":"In order for keeping the amplitude of the excitation current of a vibrator constant irrespective not only of the temperature variation but also of the manufacturing variation and the variation in frequency, a comparison control circuit for controlling the amplitude of the drive signal for exciting the vibrator includes a comparative voltage supply circuit for supplying the comparative voltage, and the comparative voltage supply circuit generates the comparative voltage with a constant current source and a second resistor made of a material the same as a material of a first resistor included in a current-voltage conversion circuit."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Drive circuit and physical quantity measuring device","description":"In order for keeping the amplitude of the excitation current of a vibrator constant irrespective not only of the temperature variation but also of the manufacturing variation and the variation in freq","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8487509","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-8487509","citation_suggestion":"Patentable. \"Drive circuit and physical quantity measuring device\" (US-8487509). https://patentable.app/patents/US-8487509","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8487509","json":"https://patentable.app/api/llm-context/US-8487509","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-30T19:44:22.358Z"}