Patent ID: 11935621
Assignee: CHANGXIN MEMORY TECHNOLOGIES, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 12:
13. A calibration method, comprising:
receiving, with a differential input circuit, a first oscillation signal and a second oscillation signal, the first oscillation signal and the second oscillation signal having the same frequency and opposite phases, the duty cycle of the first oscillation signal and the duty cycle of the second oscillation signal being in a first preset range, and the differential input circuit outputting a first internal signal and a second internal signal;
receiving, with a comparison unit, the first internal signal and the second internal signal, and comparing the duty cycle of the first internal signal or the duty cycle of the second internal signal; and
controlling, with a logical unit, the differential input circuit according to an output result of the comparison unit, such that the duty cycle of the first internal signal and/or the duty cycle of the second internal signal reaches a second preset range,
wherein the receiving, with the comparison unit, the first internal signal and the second internal signal comprises:
when a flipping identification signal is at a low level, the comparison unit comparing the duty cycle of the first internal signal; and
when the flipping identification signal is at a high level, the comparison unit comparing the duty cycle of the second internal signal.