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Browse Prior Art Database

N-Device Sharing in a Mux Circuit

IP.com Disclosure Number: IPCOM000117987D
Original Publication Date: 1996-Aug-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Bui, C: AUTHOR [+4]

Abstract

Disclosed is a dynamic Complementary Metal-Oxide-Semiconductor (CMOS) mux circuit using N-device sharing technique. The application of this technique in a shifter has many considerable advantages over the conventional one such as charge sharing, fewer transistors, less dire area, less loading, less capacitance, and as a result, a faster circuit.

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N-Device Sharing in a Mux Circuit

      Disclosed is a dynamic Complementary Metal-Oxide-Semiconductor
(CMOS) mux circuit using N-device sharing technique.  The application
of this technique in a shifter has many considerable advantages over
the conventional one such as charge sharing, fewer transistors, less
dire area, less loading, less capacitance, and as a result, a faster
circuit.

      The conventional and the improved two-way dynamic CMOS circuit
shifter drawing is used to illustrate the N-device sharing technique.
In this shifter, only one data input, data<0> or data<1>, is active
high at  a time.  Also, only one shifter input (from shift<0> to
shift<14>) is active high at a time.

      In the improved circuit, if data<8> or data<0> is active, any
active shifter will provide one discharge path to ground.

      In the conventional circuit, for each output, each transistor
is needed for each data input which results in heavy loading for the
previous stage and slows down the circuit.  Furthermore, a three-way
AND could create charge sharing problem, and increase capacitance.