Ncr Corporation

Quynh-Giao X Le

Gregory Howard Milby

Ikuo J Sanwo

A high speed computer data transfer system includes a transistor diode clamping circuit for limiting pre-charge voltages in the case where multiple pre-charge cycles occur before a pull-down operation. Data bus voltage swings between logic high and logic low levels as well as pull-down times are reduced, thus lowering the time needed to transfer the data. Also, body effect upon the clamping circuit is lowered. The preferred embodiment is implemented using complementary metal-oxide-semiconductor (CMOS) technology.

Clamping circuit for data transfer bus

In a high speed digital computer data transfer system, data bus voltage swings between logic high and logic low levels are reduced by defining minimum and maximum bus voltages which lie between said logic levels, thus lowering bus transition and hence data transfer times. The output voltages are converted to the proper logic levels with the aid of a differential (sense) amplifier. The preferred embodiment is implemented using complementary metal-oxide-semiconductor (CMOS) technology.

High speed digital computer data transfer system having reduced bus

An emitter coupled logic (ECL)-to-complementary metal-oxide-semiconductor (CMOS) logic level translator is temperature compensated to track temperature induced shifts in the ECL logic levels. The translator includes a differential amplifier with mid-range reference voltage. A reference voltage generator supplies the reference voltage to the differential amplifier and has a temperature sensitive transistor which changes the value of the circuit output (reference) voltage ambient with temperature shifts.

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Escondido, CA, United States of America

Quynh-Giao X Le