METHOD FOR DETECTING MINIMUM OPERATIONAL FREQUENCY
First Claim
1. A method of detecting a minimum operational frequency, comprising:
- generating a signal that becomes an oscillating signal at a first predetermined frequency; and
generating a logic signal to provide a level transition when a frequency of the oscillating signal reaches a second predetermined frequency corresponding to the minimum operational frequency.
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Abstract
A method of detecting a minimum operational frequency includes: generating a signal that becomes an oscillating signal at a first predetermined frequency; and generating a logic signal to provide a level transition when a frequency of the oscillating signal reaches a second predetermined frequency corresponding to the minimum operational frequency. The logic signal is generated by: providing a transistor that is activated at the second predetermined frequency; providing a capacitor; storing charges in the capacitor when the oscillating signal is below the second predetermined frequency; discharging the capacitor when the transistor is activated by the oscillating signal; and outputting the logic signal when the capacitor discharges.
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Citations
8 Claims
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1. A method of detecting a minimum operational frequency, comprising:
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generating a signal that becomes an oscillating signal at a first predetermined frequency; and generating a logic signal to provide a level transition when a frequency of the oscillating signal reaches a second predetermined frequency corresponding to the minimum operational frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification