Circuit device and oscillator
AssigneeSeiko Epson Corporation
InventorYosuke Itasaka
Life of this patent
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Abstract
A circuit device includes a first terminal to be coupled to one end of a resonator, a second terminal to be coupled to another end of the resonator, an amplifying element configured to amplify a signal from the first terminal to output the signal amplified to the second terminal, a first resistor element disposed on a signal path between an input node and an output node of the amplifying element, a capacitance element disposed on a signal path between the first terminal and the input node, and a first switch element configured to switch electrical coupling between the input node and a ground.
Claims14
A circuit device comprising:
- a first terminal to be coupled to one end of a resonator;
- a second terminal to be coupled to another end of the resonator;
- an amplifying element configured to amplify a signal from the first terminal to output the signal amplified to the second terminal;
- a first resistor element disposed on a signal path between an input node and an output node of the amplifying element;
- a capacitance element disposed on a signal path between the first terminal and the input node;
- a first switch element configured to switch electrical coupling between the input node and a ground;
- a third terminal;
- a fourth terminal;
- a second switch element configured to switch electrical coupling between the first terminal and the third terminal;
- and
- a third switch element configured to switch electrical coupling between the second terminal and the fourth terminal,
- wherein
- in a first mode, the first switch element, the second switch element, and the third switch element are set to an OFF state, and
- in a second mode, the first switch element, the second switch element, and the third switch element are set to an ON state.
A circuit device comprising:
- a first terminal to be coupled to one end of a resonator;
- a second terminal to be coupled to another end of the resonator;
- an amplifying element configured to amplify a signal from the first terminal to output the signal amplified to the second terminal;
- a first resistor element disposed on a signal path between an input node and an output node of the amplifying element;
- a capacitance element disposed on a signal path between the first terminal and the input node;
- and
- a first switch element configured to switch electrical coupling between the input node and a ground,
- wherein
- the amplifying element is a bipolar transistor,
- the input node is a base of the bipolar transistor,
- the output node is a collector of the bipolar transistor, and
- when the first switch element is in an ON state, a potential difference between the base and the ground is smaller than a diffusion potential of a P-N junction.
Dependencies are inferred from the claim text.