In BCD (Binary Coded Decimal), a binary pattern is used to represent a decimal number. A 7 segment display is used to display hexadecimal numeral by seven LEDs arranged in a definite pattern as shown in figure (a). A BCD to 7 segment decoder accepts the BCD code on its input and provide output to …
Decoders are the combinational circuits that detect the presence of some code on its input and indicate the presence of that code by a specified output. Generally, a decoder has n input lines and 2n output lines. Basic binary decoder Suppose we need to detect the occurrence of binary number 1100 on the input of …
In a ripple carry adder, the carry from the previous stage should occur first to produce the sum and output carry of any stage. This causes a time delay in the addition process and is called propagation delay or ripple carry delay. The look-ahead carry addition is a method used to speed up the addition …
A full adder can be used to perform addition of two bits with an input carry. To add an N-bit number, multiple full adder circuits can be cascaded parallelly. Such an arrangement of full adders is called a parallel adder. N full adders are required to add n bits. A ripple-carry adder is a parallel …
A full subtractor is a combinational circuit that performs subtraction of three bits. This circuit has three inputs the minuend A, subtrahend B, and borrow in Bin. Bin is the borrow of the previous adjacent lower minuend bit. This Bin is also subtracted from A-B. A full subtractor has two outputs, D and Bout, represents …
