Patent ID: 8129968

Claim:
An integrated circuit for system calibration, applicable to a power supply, comprising: a comparison module, having a feedback input end and a reference input end, wherein said feedback input end is coupled to a feedback signal, said reference input end is coupled to an analog reference signal, and a status signal is output from said comparison module according to the comparison of said feedback signal with said analog reference signal; a detection and control module, for generating a time-varying reference signal and a calibration value according to said status signal, wherein said calibration value is derived from said time-varying reference signal at an instant when said status signal changes state, and said calibration value is stored into a calibration value register; a memory module, coupled to said detection and control module for receiving, storing and outputting said calibration value; and a reference signal generator, receiving said calibration value from said memory module and receiving said time-varying reference signal from said detection and control module to provide said analog reference signal, wherein said detection and control module can control said reference signal generator directly or via said memory module.