Subtractor

Subtractor

In electronics, a subtractor can be designed using the same approach as that of an adder.The binary subtraction process is summarized below.As with an adder, in the general case of calculations on multi-bit numbers, three bits are involved in performing the subtraction for each bit: the minuend (X_i), subtrahend (Y_i), and a borrow in from the previous (less significant) bit order position (B_i).The outputs are the difference bit (D_i) and borrow bit B_{i+1}.

:D_i = X_i oplus Y_i oplus B_i: K-map B_i(1,2,3,7)

ee also

* Adder (electronics)
* Carry look-ahead adder
* Carry save adder
* Adding machine
* Adder-subtracter


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