Method and apparatus for post-fabrication ascertaining and provi

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Having specific delay in producing output waveform

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327278, H03H 1126

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active

055393497

ABSTRACT:
The present invention includes a variable delay element that can be programmed by a combination of control signals whose values may be determined by a matrix of programming elements, preferably fuses. In a TEST mode, a multiplexer array decouples the matrix, and instead couples a combination of user provided TEST mode control signals to the variable delay element. TEST mode permits selection of a suitable delay by observing the effect on IC functionality of all available values of delay provided by these TEST mode user-provided control signals. Once a suitable delay has been determined, the matrix may be programmably altered to permanently store and provide to the variable delay element the appropriate pattern of control signals to produce such delay.

REFERENCES:
patent: 5014226 (1991-05-01), Horstmann et al.
patent: 5341382 (1994-08-01), Levitt
patent: 5359547 (1994-10-01), Cummins et al.
patent: 5369646 (1994-11-01), Shikatani
patent: 5376849 (1994-12-01), Dickol et al.

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