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:
Oct. 28, 2008
Filed:
Aug. 05, 2005
Hirofumi Kawashima, Tokyo, JP;
Hirofumi Kawashima, Tokyo, JP;
Piedek Technical Labatory, , JP;
Abstract
A method for manufacturing an electronic apparatus comprises forming a quartz crystal tuning fork resonator having a fundamental mode of vibration and a second overtone mode of vibration each comprised of a flexural mode of an inverse phase, a series resistance Rof the fundamental mode of vibration and a series resistance Rof the second overtone mode of vibration. An amplification circuit is provided having a CMOS inverter, a feedback resistor, a negative resistance −RLfor the fundamental mode of vibration of the quartz crystal tuning fork resonator, and a negative resistance −RLfor the second overtone mode of vibration thereof. A feedback circuit is provided having the quartz crystal tuning fork resonator, a plurality of capacitors and a drain resistor. The quartz crystal tuning fork resonator is electrically connected to the CMOS inverter and the feedback resistor of the amplification circuit and to the capacitors and the drain resistor of the feedback circuit.