Electronic digital logic circuitry – Function of and – or – nand – nor – or not – Bipolar transistor
Patent
1994-06-13
1996-04-09
Westin, Edward P.
Electronic digital logic circuitry
Function of and, or, nand, nor, or not
Bipolar transistor
326129, 326 89, H03K 1920
Patent
active
055065210
ABSTRACT:
A series-gated ECL driver, such as a series-gated ECL cut-off driver, is provided with settable output rise time and settable output fall time, in order to reduce noise at the output of the driver while limiting the delay resulting from such noise reduction. A method is also provided for so controlling an ECL driver. The driver includes at least two current switches fed by a current source. Each current switch includes a NOR side including one or more transistors, and an OR side including one or more transistors. The input to the NOR side of one such current switch can be buffered with an input emitter follower, and the output from that current switch can be buffered with an output emitter follower. A capacitance is connected across the one current switch and the current source, that is between the collector(s) and emitter(s) of the NOR side transistor(s) of that current switch, and the input side of the current source. Another capacitance is connected at one electrode both to the collector(s) of the OR side transistor(s) of that current switch and to the base(s) of the output emitter follower transistor(s). In one embodiment, the remaining side of the other capacitance is connected to ground and to the collector(s) of the output emitter follower transistor(s). In another embodiment, the other side of the other capacitance is connected to the collector(s) of the NOR side transistor(s) of that current switch. In still another embodiment, the other side of the other capacitance is connected to the current source and to the emitter(s) of the NOR side transistor(s) and the OR side transistor(s) of another of the at least two current switches.
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Axenfeld Robert R.
Sanders Andrew
Starr Mark T.
Unisys Corporation
Westin Edward P.
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