| 摘要 |
A periodic sequence of signals is intiated and provided to a counter. During this time, a pulse (PULSE) is generated. Upon reaching a terminal count the pulse is terminated. The pulse is provided to a delay element which receives at its input a signal (s) entering, processed within or exiting a semiconductor device. The pulse and periodic sequence of signals are initiated by an edge detector detecting a trigger signal (TRIGGER), which may be the signal (s) being delayed. The sequence of signals is generated by a circuit element, such as a ring oscillator, and the periodicity of the sequence of signals is related to the inherent switching speed of the semiconductor device technology. A plurality of delay circuits are provided in a semiconductor device for individually delaying a plurality of signals entering, processed within and exiting the device. A library of delay circuits may pre-designed, and stored for implementation, as needed, in semiconductor devices. The delay imposed on signals entering, processed within and exiting the device is readily modified by modifying the periodicity of the sequence of signals and/or modifying the terminal count. Method and apparatus are disclosed.
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