Dual switching reference voltages

Details Dual switching reference voltages Dual switching reference voltages

2001-07-27

2004-12-28

Deb, Anjan K. (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

With auxiliary means to condition stimulus/response signals

C324S076590, C327S078000, C375S318000

Reexamination Certificate

active

06836127

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 on device to another, one integrated circuit (or chip) to another or within an integrated circuit itself. There has been a continuing need for this communication to be faster.
SUMMARY OF THE INVENTION
Two reference voltages and two differential receivers are used to detect low-to-high and high-to-low transitions on an input signal and set a received signal output. One reference voltage is set near but under the electrical high voltage level and the other is set near but above the electrical low voltage level. The reference voltage that is closest to the input signal is designated as the active reference voltage. When the input signal crosses the active reference voltage, the digital value of the received signal output is changed. When the input signal then crosses the inactive reference voltage, the inactive reference voltage is made the active reference voltage. A dead-time is then waited where input signal crossings of the active reference voltage are ignored. After the dead-time, input signal crossings of the active reference voltage will change the received signal output.


REFERENCES:
patent: 5696777 (1997-12-01), Hofsaess
patent: 5933459 (1999-08-01), Saunders et al.
patent: 6262602 (2001-07-01), Draving
patent: 6462558 (2002-10-01), Taurand

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