Variable delay module

Details Variable delay module Variable delay module

1999-08-02

2001-01-02

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Having specific delay in producing output waveform

C327S276000, C327S158000

Utility Patent

active

06169437

ABSTRACT:

FIELD OF THE INVENTION
This invention relates generally to variable delay and, more particularly, to continuously variable delay.
BACKGROUND OF THE INVENTION
Test equipment has been manufactured by a number of vendors for a number of general and special test applications. One such special test application is associated with test equipment designed to perform various simulations. The problems associated with simulation test equipment are numerous, however one problem that has been particularly troublesome is the problem of providing continuously adjustable delay needed to represent the delay associated with a Doppler shift in a communications system.
Some prior art solutions to the problem contained discrete delay jumps, which caused communication links to loose phase lock. In addition, the discrete delay jumps associated with prior art solutions to the problem added noise to simulations. Also, some prior art solutions included a discrete delay circuit that implemented a desired delay using discrete steps, and these nonlinear steps can cause problems with tracking loops.
What is needed is a method and apparatus for providing a continuous phase change in the signal delay, which allows tracking loops to remain locked. Further needed is a method and apparatus for providing continuous delay change to an analog signal.


REFERENCES:
patent: 5109394 (1992-04-01), Hjerpe et al.
patent: 5150066 (1992-09-01), Butel et al.
patent: 5604775 (1997-02-01), Saitoh et al.
patent: 5771264 (1998-06-01), Lane
patent: 5859551 (1999-01-01), Ohishi et al.
patent: 5910753 (1999-06-01), Bogdan
patent: 362231508A (1987-10-01), None

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