A digital calibration device and method for a high speed digital system. A digital calibration device coupled to a timing device in a high speed digital system for digitally calibrating the timing device includes a delay estimator, a control logic, and a digitally controlled load unit. In operation, the delay estimator calculates a delay value indicative of a timing delay between a first output and a second output of a timing device of the high speed digital system. Further, the control logic generates a control signal based on the delay value. Furthermore, the digitally controlled load unit applies at least one of a first load to a non-delayed line and a second load to a delayed line of the timing device based on the control signal to calibrate a timing delay between the non-delayed line and the delayed line of the timing device.