Controllable precision on-chip delay element

Details Controllable precision on-chip delay element Controllable precision on-chip delay element

1996-09-13

1998-03-24

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Having specific delay in producing output waveform

327284, H03H 1126

Patent

active

057317267

ABSTRACT:
A controllable precision delay line implemented in a digital integrated circuit device including a counter circuit for measuring a representative propagation delay for a delay element in the digital integrated circuit, and a binary controlled digital delay line responsive to the counter circuit and including L delay stages respectively having 2.sup.0 through 2.sup.L-1 delay elements, wherein the delay stages are controllably switched into a delay path pursuant to the measured representative propagation delay. Preload connections are provided between the outputs of delay elements of stages S(0) through S(L-2) and inputs of delay elements of the next in sequence stages S(1) through S(L-1) to prevent glitches being imposed on the delayed signal during adjustments in the number of stages included in the delay path.

REFERENCES:
patent: 5095233 (1992-03-01), Ashby et al.
patent: 5192886 (1993-03-01), Wetlaufer
patent: 5570294 (1996-10-01), McMinn et al.
patent: 5670904 (1997-09-01), Moloney et al.

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