Electronic circuit
AssigneeFujitsu Limited
InventorTetsutaro HASHIMOTO
Life of this patent
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Abstract
An electronic circuit includes an oscillator configured to generate an oscillating signal having a cycle responsive to an input signal, a voltage detector configured to produce a detection signal responsive to a power supply voltage, a frequency divider configured to generate a frequency-divided signal obtained by dividing a frequency of the oscillating signal by a frequency-division ratio responsive to the detection signal, and an adder configured to obtain a sum of a first signal and a second signal and to supply a signal responsive to the sum to the oscillator as the input signal, the first signal being responsive to a difference in phase between the frequency-divided signal and a reference signal, and the second signal being responsive to the detection signal.
Claims12
An electronic circuit, comprising:
- an oscillator configured to generate an oscillating signal having a cycle responsive to an input signal;
- a voltage detector configured to produce a detection signal responsive to a power supply voltage;
- a frequency divider configured to generate a frequency-divided signal obtained by dividing a frequency of the oscillating signal by a frequency-division ratio responsive to the detection signal;
- and
- an adder configured to obtain a sum of a first signal and a second signal and to supply a signal responsive to the sum to the oscillator as the input signal, the first signal being responsive to a difference in phase between the frequency-divided signal and a reference signal, and the second signal being responsive to the detection signal.
A method of controlling an oscillator, comprising:
- causing the oscillator to generate an oscillating signal having a cycle responsive to an input signal applied to the oscillator;
- producing a detection signal responsive to a power supply voltage;
- performing a frequency-divided-signal generating process to generate a frequency-divided signal obtained by dividing a frequency of the oscillating signal by a frequency-division ratio responsive to the detection signal;
- and
- performing an input-signal supplying process to obtain a sum of a first signal and a second signal and to supply a signal responsive to the sum to the oscillator as the input signal, the first signal being responsive to a difference in phase between the frequency-divided signal and a reference signal, and the second signal being responsive to the detection signal.
Dependencies are inferred from the claim text.