发明名称 |
Method and apparatus for dynamically controlling the timing of signals in automatic test systems |
摘要 |
Apparatus for delaying an electrical signal includes a sequence of stages, each for delaying the signal. A coarser stage delays the signal by multiples of a predetermined fundamental delay interval and a finer stage provides for fine adjustment of the delay. The fine stage includes an integral number N of delay elements, the total providing a delay interval greater than the fundamental delay interval, whereby the fine delay intervals compensate for fabrication tolerances to enable accurate calibration of the combined system by post-fabrication measurement. In one implementation each delay stage includes a tapped transmission line to provide delay intervals, in another a ramp generator is used. |
申请公布号 |
US4820944(A) |
申请公布日期 |
1989.04.11 |
申请号 |
US19860924073 |
申请日期 |
1986.10.28 |
申请人 |
SCHLUMBERGER SYSTEMS & SERVICES, INC. |
发明人 |
HERLEIN, RICHARD F.;DAVIS, JEFFREY A.;COTRISS, E. JAMES |
分类号 |
G01R31/317;G01R31/319;G01R31/3193;G11C7/22;H03K5/00;H03K5/13;H03K5/14;(IPC1-7):H03K3/86 |
主分类号 |
G01R31/317 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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