Patent ID: 11962307
Assignee: SIGMASTAR TECHNOLOGY LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. A comparator circuit, detecting an operating mode according to a first supply voltage and a second supply voltage, the comparator circuit comprising:
a filter circuit;
a second transistor, receiving the second supply voltage through the filter circuit, and selectively turned on according to a level of a control node so as to transmit the second supply voltage to a first node;
a comparator, comparing a level of the first node with a predetermined voltage to generate a first signal, wherein the predetermined voltage is generated by dividing the first supply voltage;
a first transistor, selectively turned on according to the first signal so as to output the first supply voltage as a first control signal; and
a pull-down resistor, coupled between the first transistor and a ground.