| 摘要 |
A clock generator includes a ring oscillator for outputting a basic signal, a divide-by-N frequency divider for dividing the basic signal by a division ratio N to generate a clock signal having a target frequency, a divide-by-two frequency divider for dividing the clock signal by two when an enable signal is on, a counter for counting the number of pulses of the basic signal for a predetermined period of time, a calculator for calculating the division ratio N, and a comparator for comparing a count value of the counter with a threshold value. When the count value of the counter is less than the threshold value, the comparator turns on the enable signal. Thus, when a temperature of the ring oscillator increases, the frequency of the clock signal is reduced to half the target frequency.
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