Ripple Carry Adder Explained (with Solved Example) | Working and Limitation of Ripple Carry Adder
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3 سال پیش
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In this video, the Ripple
In this video, the Ripple Carry Adder (Parallel Adder) is explained in detail.
And at the later part of the video, the Solved example related to Ripple Carry Adder is also explained.
The Following Topics are covered in the video:
0:00 Introduction
0:55 n-bit Parallel Adder (Ripple Carry Adder) and it's working
4:16 Limitation of Ripple Carry Adder (using Example)
10:01 Solved Example
Ripple Carry Adder:
In Ripple Carry Adder, to add two n-bit numbers, the n-number of full-adder stages are cascaded. The output carry of one adder is given as an input to the next higher full-adder stage.
Because of this arrangement, the carry has to propagate through each full-adder stage before it reaches the final stage of the adder. That is why it is known as the Ripple Carry Adder.
This adder is also known as the parallel adder.
Limitation of Ripple Carry Adder:
Each full-adder stage has its own propagation delay. That means the moment we apply the input bits, the valid sum and carry output will be after finite delay. This propagation delay depends on the internal circuit of the full-adder as well as the propagation delay of each logic gate in the logic circuit.
Because of this propagation delay, the carry output of each stage is available only after the propagation delay. And for the input carry, each stage has to wait until its previous stage generates the valid carry output. Therefore, the full-adder at the MSB position has to wait for the incoming carry for the longest time.
Because of this carry propagation delay, the valid sum and carry output of the n-bit adder is available after a certain delay. And as the number of bits in the adder stage increases, this delay also increases.
In this video, the limitation of this Ripple Carry Adder is explained using a couple of examples.
For more videos related to digital circuits, check this playlist:
• Digital Electronics
This video will be helpful to all the students of science and engineering in understanding the Frequency Division Multiplexing (FDM) technique.
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3 سال پیش
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