Control circuit and control method
AssigneeFujitsu Limited
InventorRyuichi Nishiyama
Life of this patent
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Abstract
A noise detection circuit includes a first delay circuit which has a propagation delay of a first delay time when a signal propagates therethrough and a second delay circuit which has a propagation delay of a second delay time when the signal propagates therethrough, and outputs, based on a sum of the first delay time and the second delay time, a detection result indicating the magnitude of noise on power supply voltage applied to the first delay circuit and the second delay circuit. A control unit controls, based on the detection result, a frequency of a clock signal supplied to a circuit unit to which the power supply voltage is applied and the second delay time in such a manner as to exhibit an opposite behavior to a change in the first delay time induced by temperature.
Claims7
A control circuit comprising:
- a noise detection circuit configured to include a first delay circuit which has a propagation delay of a first delay time when a signal propagates therethrough and a second delay circuit which has a propagation delay of a second delay time when the signal propagates therethrough, and configured to output, based on a sum of the first delay time and the second delay time, a detection result indicating magnitude of noise on power supply voltage applied to the first delay circuit and the second delay circuit;
- and
- a control unit configured to control, based on the detection result, a frequency of a clock signal supplied to a circuit unit to which the power supply voltage is applied and the second delay time in such a manner as to exhibit an opposite behavior to a change in the first delay time induced by temperature.
A control method comprising:
- outputting, by a noise detection circuit including a first delay circuit which has a propagation delay of a first delay time when a signal propagates therethrough and a second delay circuit which has a propagation delay of a second delay time when the signal propagates therethrough, a detection result indicating magnitude of noise on power supply voltage applied to the first delay circuit and the second delay circuit, based on a sum of the first delay time and the second delay time;
- and
- controlling, by a control unit, based on the detection result, a frequency of a clock signal supplied to a circuit unit to which the power supply voltage is applied and the second delay time in such a manner as to exhibit an opposite behavior to a change in the first delay time induced by temperature.
A non-transitory computer-readable recording medium storing therein a control program that causes a computer to execute a process comprising:
- outputting, using a noise detection circuit including a first delay circuit which has a propagation delay of a first delay time when a signal propagates therethrough and a second delay circuit which has a propagation delay of a second delay time when the signal propagates therethrough, a detection result indicating magnitude of noise on power supply voltage applied to the first delay circuit and the second delay circuit, based on a sum of the first delay time and the second delay time;
- and
- controlling, using a control unit, baaed on the detection result, a frequency of a clock signal supplied to a circuit unit to which the power supply voltage is applied and the second delay time in such a manner as to exhibit an opposite behavior to a change in the first delay time induced by temperature.
Dependencies are inferred from the claim text.