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:
Jan. 19, 1993
Filed:
Aug. 12, 1991
Sumihiro Takashima, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
An RC oscillator for varying an oscillation frequency which has a counter for counting a clock pulse of the oscillation frequency and for outputting a counted value in a form of a plurality of bits to an output terminal. It also includes a standard capacitor, a plurality of capacitors having a capacitance value in proportion to a weight of bits outputted from the counter, and a plurality of switches connected to one end of each capacitor for selectively connecting the capacitors in parallel. A plurality of first gate circuits control the switches connected thereto in response to an output of the counter, each first gate circuit has an input terminal connected to an output terminal of the counter and an output terminal connected to a control terminal of the switches. A second gate circuit turns on the switches independently of the output of the counter in the case of a frequency adjustment of the oscillation signal, the second gate circuit has an input terminal connected to a predetermined output terminal of the counter and an output terminal connected to a switch for use of the standard capacitor.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile