An oscillator includes a first oscillating portion that outputs a first oscillation signal having a first oscillation frequency through a first intermediate node to an output terminal, a mounting portion that includes an insulating layer and that mounts the first oscillating portion, a first line provided in the insulating layer and coupled between the first intermediate node and ground, a second line provided in the insulating layer and coupled between the first intermediate node and a power supply terminal, and a third line provided in the insulating layer and coupled between the first intermediate node and the output terminal.
1. An oscillator comprising:
a first oscillating portion that outputs a first oscillation signal having a first oscillation frequency through a first intermediate node to an output terminal;
a mounting portion that includes an insulating layer and that mounts the first oscillating portion;
a first line provided in the insulating layer and coupled between the first intermediate node and ground;
a second line provided in the insulating layer and coupled between the first intermediate node and a power supply terminal;
a third line provided in the insulating layer and coupled between the first intermediate node and the output terminal; and
a first capacitor connected between the first line and the ground,
wherein the first line and the first capacitor have an impedance for preventing a leakage of the first oscillation signal to the ground.
2. The oscillator as claimed in claim 1 , wherein:
the insulating layer is made of stacked multiple insulating layers; and
the first line, the second line, and the third line are respectively provided in different insulating layers.
3. The oscillator as claimed in claim 1 , wherein the first line, the second line, and the third line are each directly connected to the first intermediate node.
4. The oscillator as claimed in claim 1 , further comprising a second capacitor connected between the third line and the output terminal.
5. The oscillator as claimed in claim 1 , further comprising an inductor connected between the third line and the output terminal.
6. The oscillator as claimed in claim 1 , wherein: the first oscillating portion includes:
a resonance circuit that generates a resonance signal having a frequency controlled by a control voltage; and
an oscillation circuit that generates the first oscillation signal having the frequency of the resonance signal.
7. The oscillator as claimed in claim 1 , wherein the first oscillating portion does not include a buffer circuit therein.
8. An oscillator comprising:
a first oscillating portion that outputs a first oscillation signal having a first oscillation frequency through a first intermediate node to an output terminal;
a mounting portion that includes an insulating layer and that mounts the first oscillating portion;
a first line provided in the insulating layer and coupled between the first intermediate node and ground;
a second line provided in the insulating layer and coupled between the first intermediate node and a power supply terminal;
a third line provided in the insulating layer and coupled between the first intermediate node and the output terminal; and
a second oscillating portion that is connected through a second inductance element to a second intermediate node provided between the first intermediate node and the output terminal, and that outputs a second oscillation signal having a second oscillation frequency through the second intermediate node to the output terminal.
9. The oscillator as claimed in claim 8 , wherein the second oscillation frequency is lower than the first oscillation frequency.
10. The oscillator as claimed in claim 8 , further comprising a third oscillating portion that is connected through a third inductance element to a third intermediate node provided between the second intermediate node and the second oscillating portion, and that outputs a third oscillation signal having a third oscillation frequency through the third intermediate node to the output terminal.
11. The oscillator as claimed in claim 10 , wherein the third oscillation frequency is lower than the second oscillation frequency.