Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Regenerating or restoring rectangular or pulse waveform
Patent
1995-12-22
1998-02-10
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Regenerating or restoring rectangular or pulse waveform
327170, 326 51, H03K 501
Patent
active
057173524
ABSTRACT:
A wave formatter circuit for generating a test signal of predetermined waveform in a repetition rate determined by a pattern cycle of a semiconductor test system includes a timing generator for generating a first clock signal and a second clock signal, a waveform shaper which receives the first and second clock signals for generating a set signal and a reset signal, a flip-flop which generates a test signal of predetermined waveform at the timing determined by the set signal and the reset signal, a pattern generator for generating a test pattern data at the rate of the pattern cycle, a data selector which selects first pattern data and second pattern data from the pattern generator to be supplied to the waveform shaper, an inhibit circuit which receives the first and second pattern data from the data selector and provides an inhibit signal to the waveform shaper to prohibit either one of the first and second clock signals in the same pattern cycle passing through the waveform shaper, where the set signal and the reset signal are generated by the timings determined by the first and second clock signals under the control of the first and second pattern data and the inhibit signal.
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patent: 5179293 (1993-01-01), Hilton
patent: 5305271 (1994-04-01), Watanabe
patent: 5406132 (1995-04-01), Housako
Advantest Corporation
Callahan Timothy P.
Nu Ton My-Trang
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