SEMICONDUCTOR DEVICE

摘要

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.

主权项

1. 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.