Patent ID: 11892869
Assignee: SIGMASTAR TECHNOLOGY LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 7:
8. A clock generation method, comprising:
generating a first clock signal by a first clock generator circuit in response to a supply voltage, the first clock generator circuit having a first starting voltage;
generating a second clock signal by a second clock generator circuit in response to the supply voltage, the second clock generator circuit having a second starting voltage, wherein the first starting voltage is lower than the second starting voltage;
detecting the second clock signal to generate a validation signal; and
selectively outputting one of the first clock signal and the second clock signal according to the validation signal;
detecting the first clock signal by a second detector circuit to generate a first control signal;
delaying the validation signal by a first delay circuit to generate a first signal;
delaying the first control signal by a second delay circuit to generate a second signal; and
generating a second control signal by a logic gate circuit according to the first signal and the second signal;
wherein, a delay time of the first delay circuit is less than a delay time of the second delay circuit.