OSCILLATION CIRCUIT HAVING SHIELD WIRE, AND ELECTRONIC APPARATUS
There is provided an oscillation circuit including a crystal vibrator that is connected between input and output terminals of a CMOS inverter making up the oscillation circuit; an input wiring line that includes a crystal vibrator-side input terminal connected to an input terminal pad of the CMOS inverter; an output wiring line that includes a crystal vibrator-side output terminal connected to an output terminal pad of the CMOS inverter; a ground power source wiring line that includes a crystal vibrator-side ground power source terminal; and a capacitative element that is connected between the input wiring line and the ground power source wiring line, and between the output wiring line and the ground power source wiring line, wherein the ground power source wiring line is disposed at least a part of between the input wiring line and the output wiring line.
1 . An oscillation circuit comprising:
a crystal vibrator having an input terminal and an output terminal;
an electrical circuit comprising an inverter which is electrically connected between the input and output terminals of the crystal vibrator, wherein the electrical circuit comprise an input terminal, an output terminal and a ground terminal;
an input wiring and an output wiring extensive between the crystal vibrator and the electrical circuit to electrically connect the crystal vibrator and the inverter, wherein the input and output wirings have a first input end and a first output end connected, respectively, to the input and output terminals of the crystal vibrator and a second input end and a second output end connectible, respectively, to the input and second terminals of the electrical circuit; and
a ground wiring that defines a reference voltage level and is electrically connected to the ground terminal of the electrical circuit, wherein the ground wiring has an extension running between the input and output wirings to substantially segregate one from the other.
2 . The oscillation circuit according to claim 1 , wherein the ground wiring further runs in a shape of a closed loop to encompass the input and output wirings.
3 . The oscillation circuit according to claim 1 , wherein the ground wiring further runs in a shape of the letter “C” to surround the input and output wirings.
4 . The oscillation circuit according to claim 1 , wherein the extension of ground wiring has a terminal end connected to the ground terminal of the electrical circuit.
5 . The oscillation circuit according to claim 1 , wherein the ground wiring has a terminal end connected to the ground terminal of the inverter and located such that one of the first and second wirings is located between the terminal end of the ground wiring and the other of the first and second wirings.
6 . The oscillation circuit according to claim 1 , wherein the extension of the ground wiring extends to connect directly to the ground terminal of the electrical circuit.
7 . The oscillation circuit according to claim 1 , wherein the ground wiring runs on both sides of the oscillation circuit.
8 . The oscillation circuit according to claim 7 , wherein the ground wiring runs in a shape of the letter “C” on each side of the oscillation circuit to form a closed loop in combination.
9 . The oscillation circuit according to claim 7 , wherein the ground wiring runs in a shape of a closed loop on one side of the oscillation circuit.
10 . The oscillation circuit according to claim 1 , wherein the electrical circuit is contained in an IC chip comprising the inverter.
11 . The oscillation circuit according to claim 1 , wherein the electrical circuit is contained in an IC package comprising the inverter.
12 . The oscillation circuit according to claim 1 , wherein the oscillation circuit comprises a double-layered substrate.
13 . An electronic device comprising the oscillation circuit according to claim 1 .