Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1992-12-16
1994-08-09
Westin, Edward P.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307475, 307263, H03K 1716
Patent
active
053369483
ABSTRACT:
An active negation emulator circuit for improving the noise margin of signals carried by a signal interface bus. The circuit includes a sensor for sensing the voltage on the bus and a variable current source for supplying a current to the bus when the voltage level thereon is greater than a predetermined value. More particularly, when the voltage level on the bus is indicative of the signal carried thereby being in a logic high state, a current is supplied to raise the voltage level to the desired logic high voltage level. A combination circuit is also provided including an active negation emulator circuit, a resistive terminator, and switch means for selectively coupling the active negation emulator to the signal interface bus, coupling the resistive terminator to the signal interface bus, or decoupling both the emulator and the terminator from the bus, in accordance with the location of the bus to which the combination circuit is coupled.
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Sanders Andrew
Unitrode Corporation
Westin Edward P.
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