Skew calibration means and a method of skew calibration

摘要

Automatic test equipment for memory device testing with elements providing a high accuracy of transferring and receiving signals when testing a semiconductor device under test (DUT) by intelligent skew calibration of a timing system. The device for automatic skew calibration of a transceiver comprises a plurality of input registers for transmitting signals; a plurality of output registers for receiving signals; a main clock driver for generating a main clock signal; a reference clock driver for generating reference signals for calibrating the registers; the reference clock driver being associated with the main clock driver; and a plurality of phase shifters comprising at least one set of phase shifters associated with each plurality of registers, for the relative alignment of the register's timing within each plurality. The calibration is performed using a common time base which is distributed by means of a transmission line having predetermined wave characteristics.