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What is Manchester carry chain?(a) Is a chain of controlled inverter(b) Variation of a carry-lookahead adder(c) Variation of a full-adder(d) Variation of a ripple carry adderThis question was addressed to me in an interview.Asked question is from 4-Bit Parallel Adder/Subtractor in section Arithmetic Circuits of Digital Circuits

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The correct ANSWER is (b) Variation of a carry-lookahead adder

To ELABORATE: The Manchester carry chain is a variation of the carry-lookahead adder that uses SHARED LOGIC to LOWER the transistor count. However, the carry generating logic depends on the logic to generate the carries in the past.



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