Oscillation circuit, oscillator, method of manufacturing oscillator, electronic device, and moving object
AssigneeSeiko Epson Corporation
InventorsYosuke Itasaka, Masayuki Ishikawa, Takehiro Yamamoto, Akihiro Fukuzawa
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Abstract
An oscillation circuit includes a terminal XO which is connected to one end of a resonator, a terminal XI which is connected to the other end of the resonator, an oscillation unit which is electrically connected to the terminal XO and the terminal XI, a control voltage generation circuit, and a switch. The oscillation unit includes a variable capacitive element having one end which is connected to the terminal XO or the terminal XI. The switch controls electrical connection between the other end of the variable capacitive element and an output terminal of the control voltage generation circuit.
Claims13
An oscillation circuit comprising:
- a first terminal which is connected to one end of a resonator;
- a second terminal which is connected to the other end of the resonator;
- an oscillation unit which is electrically connected to the first terminal and the second terminal;
- a first switch operable in a normal oscillation mode and an inspection mode, wherein a current applied for exciting the resonator is greater in the inspection mode than in the normal oscillation mode;
- and
- a first voltage generation circuit, wherein:
- the oscillation unit includes at least one first electronic element having one end which is electrically connected to the first terminal or the second terminal,
- the first switch controls a voltage which is applied to the other end of the first electronic element,
- in the normal oscillation mode, the first switch electrically couples the other end of the first electronic element and an output terminal of the first voltage generation circuit, and
- in the inspection mode, the first switch electrically decouples the other end of the first electronic element from the output terminal of the first voltage generation circuit.
Dependencies are inferred from the claim text.