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:
Nov. 05, 1996
Filed:
Dec. 07, 1995
Hiroyuki Iwamoto, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A temperature-compensated piezoelectric oscillator includes a voltage-controlled piezoelectric oscillator, a first frequency divider, a second frequency divider, and a controller. The voltage-controlled piezoelectric oscillator has an output frequency controlled by a control voltage and oscillates the output frequency having a center frequency f.sub.0 at an ambient temperature of t.sub.0. The first frequency divider frequency-divides the output frequency from the voltage-controlled piezoelectric oscillator by N to output a first divided output frequency. The second frequency divider frequency-divides the output frequency from the voltage-controlled piezoelectric oscillator by M to output a second divided output frequency. The controller controls the control voltage to be applied to the voltage-controlled piezoelectric oscillator on the basis of a frequency difference between the first and second divided output frequencies upon a variation in ambient temperature of t.sub.0 to keep the output frequency of the voltage-controlled piezoelectric oscillator at the center frequency f.sub.0.