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. 14, 2006
Filed:
Mar. 18, 2004
Hiroyuki Ogiso, Ina, JP;
Hiroyuki Ogiso, Ina, JP;
Seiko Epson Corporation, , JP;
Abstract
A voltage-controlled oscillator includes a voltage-controlled phase-shift circuit, outputting a signal with the shift deviated from an input signal by a specified amount with an external control voltage Vt, a SAW resonator, a buffer, inputting a resonance signal having a specified resonance frequency from the SAW resonator, outputting a clock signal with a desired frequency, and outputting a positive-feedback-oscillation-loop output signal, wherein the voltage-controlled phase-shift circuit, the SAW resonator, and the buffer construct a positive-feedback oscillation loop, in which the frequency temperature characteristic of the SAW resonator is rotated by a specified amount using the temperature characteristic of the propagation delay time of the buffer to correct the frequency temperature characteristic of the SAW resonator.