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US 2016/0241218 A1Published application
Semiconductor device
AssigneeRenesas Electronics Corporation
InventorsMakoto MUNEYASU, Takashi KONO
Life of this patent
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Abstract
In a semiconductor device, a charge pump operates in accordance with a clock signal and thereby generates a boosted voltage of a polarity which is the same as or reverse to the polarity of an input voltage. An oscillation circuit generates and outputs a clock signal. The oscillation circuit cyclically fluctuates a frequency of the clock signal within a predetermined fluctuation range. Thereby, EMI noise generated corresponding to the frequency of the clock signal for driving the charge pump is reduced.
Claims14
A semiconductor device, comprising:
- a first charge pump which operates in accordance with a first clock signal and thereby generates a boosted voltage of a polarity which is the same as or reverse to the polarity of an input voltage;
- and
- an oscillation circuit which generates and outputs the first clock signal,
- wherein the oscillation circuit cyclically fluctuates a frequency of the first clock signal within a predetermined fluctuation range.
1 more element
A semiconductor device, comprising:
- a charge pump which operates in accordance with a clock signal and thereby generates a boosted voltage of a polarity which is the same as or reverse to the polarity of an input voltage;
- an oscillation circuit which generates and outputs the clock signal;
- a control circuit which detects the boosted voltage output from the charge pump, compares a divided voltage of the boosted voltage so detected with a reference voltage and outputs a control signal for performing on/off control on an output from the oscillation circuit on the basis of a result of comparison;
- and
- a delay circuit which is provided between the control circuit and the oscillation circuit and delays the control signal,
- wherein the delay circuit cyclically fluctuates a delay amount of the control signal within a predetermined fluctuation range.
3 more elements
Dependencies are inferred from the claim text.