Brenkung Adder Design

Exe rationalizeive Summary Adder Design The objective of the ensure is to cast a 16-bit common viper. The goal of the project is to sully the endure spell keeping power within constraints, as well as minimizing the ara. The constraints are as follows: Energy/ accomplishment has to be less(prenominal) , t trise han t0.5nJ and fare < 200ps, and use the stock(a) cell layout, which must obey each(prenominal) the design rules. Throughout the consort there were several adder topologies with different advantages been introduced, and we finally came to the conclusion to choose Brent-Kung adder architecture. The solid ground we chose this topology was because its carrying out was simpler than Radix-4 Kogge-Stone head. As a result the layout of the circuit would be less complicated. Even though it is a bit slower than the Kogg-Stone, it would salvage us time doing the layout in the end. After choosing the topology, we had to come up with the logic style to imple ment the bl We had implemented the logic blocks using transmission accesss to gain more speed. However, for simplicity in sizing the Motivations: Since we wanted the adder to operate as close as possible, we came up with some ideas to minimize the propagation delay such as: we modify the Brent-Kung tree, added 3 more shipping products and cut the number of stages for the critical path from 7 to 5.

For the Brent-Kung tree in swan to get the carryout C14, the adder has to wait for the product of C7&C11, whence C11&13 and finally C13&P14. On the other pile for the modified Brent- Kung tree C7 is directl y producted with C13 at the fourth stage. Th! is helps the C14 to be purchasable at the fifth stage. The modified Brent-Kung tree is shown below as well as the critical path, which is highlighted in red. Loading prise: Rwire=Rsq*L/W=0.75*1.8mm / 4?=281.2Ohm Cin = 24.7fF(from the sum of all the accession input capacitance of the very first stage.) Since the adder private road a 1.8mm long bus with 6 loads every bit distributed. Each capacitive load is equal...If you want to get a full essay, order it on our website: OrderCustomPaper.com

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