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:
Mar. 21, 2000
Filed:
Jul. 08, 1998
Yasuhiro Sakurai, Tokorozawa, JP;
Hiroyuki Fukayama, Tokorozawa, JP;
Citizen Watch Co., Ltd., Tokyo, JP;
Abstract
In a temperature-compensated crystal oscillator, a series connection of an AT-cut crystal resonator, a MOS capacitor, and a first fixed capacitor is coupled in parallel with an amplifier and a second fixed capacitor, making up a crystal oscillation circuit. A first control signal generating circuit for temperature compensation is connected directly or via a first input resistor to one terminal of the MOS capacitor of the crystal oscillation circuit, and a second control signal generating circuit for temperature compensation is connected dirty or via a second input resistor to the other terminal of the MOS capacitor. The first control signal generating circuit serves as a rectilinear correction signal generating circuit on the lower temperature side while the second control signal generating circuit serves as a rectilinear correction signal generating circuit on the higher temperature side.