Metal working – Piezoelectric device making
Reexamination Certificate
2005-08-05
2008-10-28
Vo, Peter (Department: 3729)
Metal working
Piezoelectric device making
C029S847000, C029S593000, C029S594000, C029S832000, C029S854000, C310S370000
Reexamination Certificate
active
07441316
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 R1of the fundamental mode of vibration and a series resistance R2of the second overtone mode of vibration. An amplification circuit is provided having a CMOS inverter, a feedback resistor, a negative resistance −RL1for the fundamental mode of vibration of the quartz crystal tuning fork resonator, and a negative resistance −RL2for 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.
REFERENCES:
patent: 4288284 (1981-09-01), Kobayashi et al.
patent: 4293986 (1981-10-01), Kobayashi et al.
patent: 5861705 (1999-01-01), Wakatsuki et al.
patent: 5912524 (1999-06-01), Ohnishi et al.
patent: 6437483 (2002-08-01), Kikuchi et al.
Adams & Wilks
Nguyen Tai
Piedek Technical Labatory
Vo Peter
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