The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 16, 1997
Filed:
May. 23, 1996
Takao Watanabe, Higashikurume, JP;
Mutsuo Hayashi, Yonezawa, JP;
Kazunari Matsumoto, Yonezawa, JP;
Chikara Tsuchiya, Machida, JP;
Eiji Nishimori, Yokohama, JP;
Takashi Matsui, Kasugai, JP;
Kabushiki Kaisha Meidensha, Tokyo, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In a digital temperature compensated crystal oscillator, ADC circuit and DAC circuit are combined into a data conversion circuit which comprises a first section for DA conversion, a second section for converting an analog temperature voltage signal into a digital form in cooperation with the first section, and a third section for supplementing the DA conversion of the first section and thereby generating an analog control voltage for a VCO from a digital temperature compensation data. There is further provided a switch circuit for connecting the output of the first section to either of the second and third section.