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US 10,374,619 B2Granted
Oscillator circuit
AssigneeNihon Dempa Kogyo Co., Ltd.
InventorKen Miyahara
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Abstract
An oscillator circuit includes an oscillating unit, a counter unit, and a set value generator. The oscillating unit is configured to output an oscillation signal having a frequency corresponding to an input frequency setting value. The counter unit is configured to count a number of pulses of the oscillation signal during a time period corresponding to a period of a reference signal input from outside. The set value generator is configured to generate the frequency setting value every predetermined time period based on the count of the pulses counted by the counter unit.
Claims6
An oscillator circuit comprising:
- an oscillating unit configured to output an oscillation signal having a frequency corresponding to a frequency setting value being input;
- a counter unit configured to count a number of pulses of the oscillation signal during a time period corresponding to a period of a reference signal input from outside;
- a set value generator configured to generate the frequency setting value every predetermined time period based on the count of the pulses counted by the counter unit;
- and
- an integration unit configured to calculate an integrated value of a difference between a reference pulse number corresponding to the frequency of the oscillation signal and a pulse number of the oscillation signal every period of the reference signal, and output the integrated value every time period of predetermined times of the period of the reference signal, wherein
- the set value generator controls the frequency setting value based on the integrated value.
3 more elements
Dependencies are inferred from the claim text.