Patent ID: 8736390

Claim:
A crystal oscillation device, comprising: a semiconductor package mounted with a semiconductor chip and including first, second and third external terminals; a quartz crystal unit; and a printed circuit board on which the semiconductor package and the quartz crystal unit are mounted, wherein an inverting logic circuit having the first external terminal as an input and the second external terminal as an output is formed on the semiconductor chip, wherein the printed circuit board has formed thereon a first wiring pattern which is formed using a first wiring layer, extends from the first external terminal, and is bonded to one end of the quartz crystal unit, wherein the printed circuit board has formed thereon a second wiring pattern which is formed using the first wiring layer, extends from the second external terminal approximately in parallel with the first wiring pattern, and is bonded to the other end of the quartz crystal unit, wherein the printed circuit board has formed thereon a third wiring pattern which is formed using the first wiring layer, arranged in a region between the first wiring pattern and the second wiring pattern, and electrically connected to a ground power source voltage of the inverting logic circuit, and wherein the third external terminal is arranged between the first external terminal and the second external terminal adjacent thereto, serves as a terminal for ground power source voltage of the inverting logic circuit, and is connected to the third wiring pattern.