CRYSTAL OSCILLATION DEVICE AND SEMICONDUCTOR DEVICE

PROBLEM TO BE SOLVED: To provide a crystal oscillator capable of fully applying a crystal oscillator corresponding to a low load capacity value.SOLUTION: For example, a wiring pattern LN_XIN for an oscillation input signal XIN and a wiring pattern LN_XOUT for an oscillation output signal XOUT are pr...

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Hauptverfasser:	ANZAI AKIHITO, OZAWA OSAMU, HORIGUCHI SHINJI, OKUDA YUICHI
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRONIC CIRCUITRY ELECTRICITY GENERATION OF NOISE BY SUCH CIRCUITS GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING,BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN ANON-SWITCHING MANNER
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a crystal oscillator capable of fully applying a crystal oscillator corresponding to a low load capacity value.SOLUTION: For example, a wiring pattern LN_XIN for an oscillation input signal XIN and a wiring pattern LN_XOUT for an oscillation output signal XOUT are provided on a printed circuit board PCB, and a wiring pattern LN_VSS 1b for ground power supply voltage VSS is arranged in an area between the wiring pattern LN_XIN and the wiring pattern LN_XOUT. A crystal oscillator XTAL is connected between the LN_XIN and the LN_XOUT, and one end of capacity Cg, Cd that are the load capacity is connected to LN_VSS 1b. Furthermore, a wiring pattern LN_VSS 1a for the VSS is arranged so as to surround these wiring patterns, and additionally, a wiring pattern LN_VSSn for the VSS is arranged in a lower layer, thereby reducing parasitic capacity between an XIN node and an XOUT node and improving in noise resistance of the node.