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US 10,476,435 B2Granted
Crystal oscillator, crystal resonator controlling method, and crystal resonator controlling device
AssigneeFujitsu Limited
InventorsMasakazu Kishi, Hajime Kubota, Masayuki Itoh, Yoshinori Mesaki
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Abstract
A crystal oscillator includes a crystal resonator; an inverting amplifier configured to be coupled between a pair of excitation electrodes of the crystal resonator; and a control circuit configured to initiate an alarm and raise gain of the inverting amplifier in a case where an index value for representing oscillation amplitude of the crystal resonator in an oscillation state is equal to or lower than a reference value.
Claims16
A crystal oscillator comprising:
- a crystal resonator;
- an inverting amplifier configured to be coupled between a pair of excitation electrodes of the crystal resonator;
- and
- a control circuit configured to initiate an alarm and to raise a gain of the inverting amplifier in a case where an index value which represents an oscillation amplitude of the crystal resonator in an oscillation state, is equal to or lower than a reference value, the gain of the inverting amplifier being raised to delay an output stop of the crystal resonator, the alarm being provided as an output of the crystal oscillator.
1 more element
A crystal oscillator controlling method comprising:
- initiating an alarm and raising a gain of an inverting amplifier coupled between a pair of excitation electrodes of a crystal resonator in a case where an index value representing an oscillation amplitude of the crystal resonator in an oscillation state is equal to or lower than a reference value, the gain of the inverting amplifier being raised to delay an output stop of the crystal resonator, the alarm being provided to an output of the crystal oscillator.
A crystal resonator controlling device comprising:
- an inverting amplifier configured to be coupled between a pair of excitation electrodes of a crystal resonator;
- and
- a control circuit configured to initiate an alarm and to raise a gain of the inverting amplifier in a case where an index value representing oscillation amplitude of the crystal resonator in an oscillation state is equal to or lower than a reference value, the gain of the inverting amplifier being raised to delay an output stop of the crystal resonator, the alarm being provided as an output of the control circuit.
Dependencies are inferred from the claim text.