The document discusses the implementation of 8-bit conditional sum adders and parallel prefix adders for fast addition. It introduces conditional sum adders that generate output sums and carries assuming an input carry of 0 or 1. Parallel prefix adders perform addition in parallel using different tree structures, including Brent-Kung, Kogge-Stone, and Ladner-Fischer adders. Circuit diagrams, layouts, and simulated waveforms are presented for 8-bit implementations of conditional sum adders and each type of parallel prefix adder. Potential areas for expansion include higher radix adders.

1. Implementation of 8-bit Conditional Sum adder and Parallel Prefix Adders for Fast AdditionbyB.GayathriK.Sushma

2. IntroductionThe csa generates two sets of outputs for a given group of operand bts say n-bits. Each set includes n-sum bits and an outgoing carry. One set assumes that the incoming carry will be zero, while the other assumes that it will be one. Once the incoming carry is known, we need only to select the carrcet set of outputs by using a multiplexer without waiting for the carrry to further propagate the n-positions.In ppa the aadition is done in parallel fashion there for it is said to be a parallel prefix adder, and some of the parallel prefix adders are Brent-Kung Adder Kogge-Stone AdderLadner-Fischer Adder

3. Conditional Sum Adder

4. Circuit Diagram of 8-bit CSA:

5. Top Model View of 8-bit CSA:

6. Simulated Waveform Using Modelsim:

7. CSA Mask layout Using I/O Pads:

8. Simulated Ouput Waveform Using Microwind Layout Editor:

9. Parallel Prefix Adders

10. Block Diagram of Parallel Prefix Adder:

11. STEP1: The pre-calculation stage is implemented bySTEP2: carry signals can be generated by using different prefix graphs.STEP3: summation unit can be implemented by

12. Calculation of Carriers in Prefix Graph:

13. Tree Structure Diagrams of Parallel Prefix Adder:Kogge-Stone Ladner-Fischer Brent-Kung

14. Top Modules for Parallel Prefix Adders: TOP VEIW OF 8-BIT KOGGE-STONE ADDER

15. TOP VIEW OF 8-BIT LADNER-FISCHER ADDER

16. TOP VIEW OF 8-BIT BRENT-KUNG ADDER

17. Simulated Waveform of KSA Using Modelsim:

18. KSA Mask layout Using I/O Pads:

19. Simulated Ouput Waveform of KSA Using Microwind Layout Editor:

20. Simulated Waveform of LFA Using Modelsim:

21. LFA Mask layout Using I/O Pads:

22. Simulated Ouput Waveform of LFA Using Microwind Layout Editor:

23. Simulated Waveform of BKA Using Modelsim:

24. BKA Mask layout Using I/O Pads:

25. Simulated Ouput Waveform of BKA Using Microwind Layout Editor:

26. Scope of Expansion:Radix-3Radix-4

27. Thanq u