Adv Antest Corporation

Yasuto Kumai

Noboru Akiyama

Tetsuya Koishi

An automatic pattern synchronizing circuit re-times the phase differences between clocks, thereby adjusting test pattern outputs from a device under test. The automatic pattern synchronizing circuit includes a reference voltage generator for providing a threshold voltage, a comparator for converting an input signal into a rectangular signal, a flip-flop, a pattern-counter part for counting a signal from the flip-flop and a control part for setting the threshold voltage in the comparator. The automatic pattern synchronizing circuit automatically synchronizes voltage patterns. In particular, the high and low voltage levels of the input waveform are automatically measured and the optimum threshold voltage is automatically set.

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Tokyo, Japan

Yasuto Kumai