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US 10,897,227 B2Granted
Oscillation circuit, oscillator, electronic device, and vehicle
AssigneeSeiko Epson Corporation
InventorTakehiro Yamamoto
Life of this patent
Estimating the term…
Abstract
An oscillation circuit includes a first node, a first switching element, and a second switching element and has a first mode in which the first switching element does not electrically couple the first external connection terminal and the first node and the second switching element does not electrically couple the first node and the second external connection terminal which is electrically coupled to one end of a resonator and a second mode in which the first switching element electrically couples the first external connection terminal and the first node and the second switching element electrically couples the first node and the second external connection terminal, and in the first mode, a voltage of the first node is fixed.
Claims16
An oscillation circuit, comprising:
- a first external connection terminal;
- a second external connection terminal that is electrically coupled to one end of a resonator;
- a third external connection terminal that is electrically coupled to the other end of the resonator;
- an amplification circuit that is electrically coupled to the second external connection terminal and the third external connection terminal, amplifies a signal output from the resonator, and supplies the amplified signal to the resonator;
- a first node;
- a first switching element that switches whether or not to electrically couple the first external connection terminal and the first node;
- a second switching element that switches whether or not to electrically couple the first node and the second external connection terminal;
- a third switching element that switches whether or not to electrically couple the first external connection terminal and the first node;
- and
- a fourth switching element that switches whether or not to electrically couple the first node and the second external connection terminal,
- wherein
- the oscillation circuit has
- a first mode in which the first switching element does not electrically couple the first external connection terminal and the first node and the second switching element does not electrically couple the first node and the second external connection terminal, and
- a second mode in which the first switching element electrically couples the first external connection terminal and the first node and the second switching element electrically couples the first node and the second external connection terminal,
- in the first mode, a voltage of the first node is fixed,
- in the first mode, the third switching element does not electrically couple first external connection terminal and the first node and the fourth switching element does not electrically couple the first node and the second external connection terminal,
- in the second mode, the third switching element electrically couples the first external connection terminal and the first node and the fourth switching element electrically couples the first node and the second external connection terminal,
- each of the first switching element and the second switching element is an N-channel MOS switch, and
- each of the third switching element and the fourth switching element is a P-channel MOS switch.
16 more elements
An oscillation circuit, comprising:
- a first external connection terminal;
- a second external connection terminal that is electrically coupled to one end of a resonator;
- a third external connection terminal that is electrically coupled to the other end of the resonator;
- an amplification circuit that is electrically coupled to the second external connection terminal and the third external connection terminal, amplifies a signal output from the resonator, and supplies the amplified signal to the resonator;
- a first node;
- a first switching element that switches whether or not to electrically couple the first external connection terminal and the first node;
- a second switching element that switches whether or not to electrically couple the first node and the second external connection terminal;
- a third switching element that switches whether or not to electrically couple the first external connection terminal and the second external connection terminal,
- wherein
- the oscillation circuit has
- a first mode in which the first switching element does not electrically couple the first external connection terminal and the first node and the second switching element does not electrically couple the first node and the second external connection terminal, and
- a second mode in which the first switching element electrically couples the first external connection terminal and the first node and the second switching element electrically couples the first node and the second external connection terminal,
- in the first mode, a voltage of the first node is fixed,
- in the first mode, the third switching element does not electrically couple the first external connection terminal and the second external connection terminal,
- in the second mode, the third switching element electrically couples the first external connection terminal and the second external connection terminal,
- each of the first switching element and the second switching element is an N-channel MOS switch, and
- the third switching element is a P-channel MOS switch.
14 more elements
An oscillation circuit, comprising:
- a first external connection terminal;
- a second external connection terminal that is electrically coupled to one end of a resonator;
- a third external connection terminal that is electrically coupled to the other end of the resonator;
- an amplification circuit that is electrically coupled to the second external connection terminal and the third external connection terminal, amplifies a signal output from the resonator, and supplies the amplified signal to the resonator;
- a first node;
- a first switching element that switches whether or not to electrically couple the first external connection terminal and the first node;
- a second switching element that switches whether or not to electrically couple the first node and the second external connection terminal;
- a third switching element that switches whether or not to electrically couple the first external connection terminal and the second external connection terminal,
- wherein
- the oscillation circuit has
- a first mode in which the first switching element does not electrically couple the first external connection terminal and the first node and the second switching element does not electrically couple the first node and the second external connection terminal, and
- a second mode in which the first switching element electrically couples the first external connection terminal and the first node and the second switching element electrically couples the first node and the second external connection terminal,
- in the first mode, a voltage of the first node is fixed,
- in the first mode, the third switching element does not electrically couple the first external connection terminal and the second external connection terminal,
- in the second mode, the third switching element electrically couples the first external connection terminal and the second external connection terminal,
- each of the first switching element and the second switching element is a P-channel MOS switch, and
- the third switching element is an N-channel MOS switch.
14 more elements
Dependencies are inferred from the claim text.