Dynamic control of switching reference voltage

Details Dynamic control of switching reference voltage Dynamic control of switching reference voltage

2003-05-29

2004-09-28

Nguyen, Minh (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

C327S205000

Reexamination Certificate

active

06798254

ABSTRACT:

FIELD OF THE INVENTION
This invention relates generally to electronic circuits and more particularly to methods and circuits for receiving digital electronic signals.
BACKGROUND OF THE INVENTION
Digital electronic signals are used to communicate digital information. This communication may be from one device to another, one integrated circuit (or chip) to another, or within, an integrated circuit itself. In many of these applications, the difference between the voltage level that denotes a “high” (or logical “1”) and the voltage level that denotes a “low” (or logical “0”) has been getting smaller. Designers have chosen these smaller differentials for reasons that include: lower power supply voltages, increasing switching speed, lowering power consumption, and the use of standard bus interfaces that have defined smaller voltage differentials.
Unfortunately, these smaller voltage differentials are harder to detect, especially in the presence of noise or other non-idealities on the signal. Accordingly, there is a need in the art for improvements that help with the detection and reception of digital signals having small voltage differentials between logical levels.
SUMMARY OF THE INVENTION
A reference voltage is moved dynamically towards a voltage level of the last received value. The movement takes place over a predetermined fraction of a bit time. The amount of movement is limited so that successive logical values don't result in an unusable reference voltage level.
Other aspects and advantages of the present invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.


REFERENCES:
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patent: 4574206 (1986-03-01), Todokoro et al.
patent: 5136382 (1992-08-01), Meyer
patent: 5233329 (1993-08-01), Lippmann et al.
patent: 5376834 (1994-12-01), Carobolante
patent: 6225929 (2001-05-01), Beck

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