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:
Feb. 28, 2006
Filed:
Dec. 03, 2003
Tomio Satoh, Kouza-gun, JP;
Tomio Satoh, Kouza-gun, JP;
Toyo Communication Equipment Co., Ltd., Kanagawa, JP;
Abstract
The invention provides a temperature compensated crystal oscillator that can obtain a large variable range and that can obtain high temperature stability. This temperature compensation system employs a configuration comprising a oscillation circuitincluding a crystal vibratorhaving a piezoelectric element excited in a given frequency and an oscillation amplifier that excites the piezoelectric element by flowing a current to the piezoelectric element, a vibrator current control circuitthat controls the current of the crystal vibrator, a temperature compensation voltage generation circuitthat compensates for temperature characteristics of the crystal vibrator, and an external variable capacitance diodethat changes the oscillation frequency of the oscillation circuitusing an external variable voltage controller. The vibrator current control circuitcomprises a variable capacitance diodethat controls the vibrator current, and capacitorsto