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posted by  ilvmyff on 11/5/2009 9:32:55 PM  |  status: Live  |  Earned Karma: 25

Design a Combinational Circuit- Help Please

Course Textbook Chapter Problem Needs by
Digital Circuits N/A N/A N/A 11/10/2009 at 7:00:00 PM
Question Details:
Design three versions of the combinational circuit whose input is a 4-bit number whose output is the 2's complement of the input number, for each of the following cases:

a) The circuit is a simplified two-level circuit, plus inverters as needed for the input variables.

b) The circuit is made up of four identical two-input, two output cells, one for each bit. The cells are connected in cascade, with lines similar to a carry between them. The value applied to the rightmost carry bit is 0.

c) The circuit is redesigned with carry lookahead-like logic in order to speed up the circuit in part (b) for use in larger circuits with 4n input bits.
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