Patent ID: 8278967
Filing Date: 2012-10-02
Classification: H03K

Abstract:
1. A data driving impedance auto-calibration circuit comprising: a detection block configured to detect an operation characteristic variation of an element, according to a code signal, and generate a calibrated characteristic voltage; a comparison block, operatively coupled to the detection block, configured to compare the calibrated characteristic voltage with a reference voltage and output a comparison result signal; a code calibration block, operatively coupled to the detection block, configured to calibrate the code signal according to the comparison result signal; and a control signal generation block, wherein the control signal generation block comprises: a calibration period signal generation unit configured to delay a command by a first delay time to generate a calibration period signal for defining an activation period of the detection block; a trigger signal generation unit, operatively coupled to the calibration period signal generation unit, configured to combine a divided signal with the calibration period signal to generate a trigger signal for enabling code calibration operation of the code calibration block; and a code initialization signal generation unit configured to delay the command by a second delay time to generate the code initialization signal.