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

Claim 0:
1. A calibration circuit, comprising:
a differential input circuit, configured to receive a first oscillation signal and a second oscillation signal, the first oscillation signal and the second oscillation signal having a same frequency and opposite phases, a duty cycle of the first oscillation signal and a duty cycle of the second oscillation signal being in a first preset range, and the differential input circuit configured to output a first internal signal and a second internal signal;
a comparison unit, connected to an output end of the differential input circuit, and configured to compare the duty cycle of the first internal signal and/or the duty cycle of the second internal signal; and
a logical unit, connected to the comparison unit and the differential input circuit, and configured to control 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 comparison unit comprises:
an integral unit with a first input end and a second input end, the first input end configured to receive one of the first internal signal or the second internal signal, and the second input end configured to receive another of the second internal signal or the first internal signal; and
a comparator, connected to an output end of the integral unit,
wherein the first input end of the integral unit is configured to receive the first internal signal when a flipping identification signal is at a low level, and receive the second internal signal when the flipping identification signal is at a high level; and
the second input end of the integral unit is configured to receive the second internal signal when the flipping identification signal is at a low level, and receive the first internal signal when the flipping identification signal is at a high level.