CadenceProject

Comparative Study of 16-bit Ripple Carry Adder and Weinberger Adder Architectures in Digital Circuit Design

https://drive.google.com/file/d/1EBO96JjRyy02wX6FjRVfSitM62dEj8g0/view?usp=sharing

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📘 Comparative Study of 16-bit Ripple Carry Adder and Weinberger Adder Architectures

This repository contains the design, simulation, and comparative analysis of 16-bit Ripple Carry Adder (RCA) and 16-bit Weinberger Adder using Cadence Virtuoso with GPDK 180 nm CMOS technology.
The project includes schematics, logic diagrams, waveforms, simulation graphs, truth tables, and the complete project report.

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🔍 Project Overview

Addition is one of the most fundamental operations in digital systems.
This project compares two adder architectures:

• Ripple Carry Adder (RCA): simple and area-efficient but slow due to sequential carry propagation
• Weinberger Adder: faster design using generate/propagate signals and parallel carry computation

Both adders were modeled, simulated, and verified using Cadence tools.

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🎯 Objectives

• Design and implement 16-bit RCA and Weinberger adders
• Create full custom schematic and symbol designs
• Simulate waveforms and verify correctness
• Extract delay and power metrics using transient simulation
• Compare both architectures for speed, power, and scalability

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🛠️ Tools & Technology

Component	Details
EDA Tool	Cadence Virtuoso
Technology Node	GPDK 180 nm
Supply Voltage	1.8 V
Analysis Type	Transient Simulation
Temperature	27°C
Simulation Library	gpdk180

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📐 Architecture Summary

🔹 Ripple Carry Adder (RCA)

• Built using 16 cascaded full adders
• Carry propagates sequentially
• Pros: simple, low area
• Cons: high delay for large bit-widths

🔹 Weinberger Adder

• Uses generate (G) and propagate (P) signals
• Parallel carry computation
• Lower delay and better scalability
• Suitable for high-speed arithmetic in DSPs and processors

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📊 Results Summary

Metric	RCA	Weinberger
Minimum Delay	1.672 ns	121.6 ps
Maximum Delay	25.25 ns	251.7 ps
Power Consumption	13.35 µW	66.25 µW

✔️ Key Findings

• Weinberger Adder delivers 10–20× lower delay
• RCA is area-efficient but slower
• Weinberger is ideal for high-speed, low-latency VLSI applications

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📷 Included Outputs

• Full custom schematics
• Output waveforms for all input combinations
• Delay vs. Time plots
• Power graphs
• Truth table verification screenshots
• Final project documentation

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📝 Conclusion

The comparative analysis demonstrates:

• RCA → simple, low-power, but high delay
• Weinberger → significantly faster due to parallel carry calculation

Therefore, Weinberger Adder is superior for modern high-speed digital systems, DSP applications, and low-latency arithmetic units.

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👩‍💻 Contributors

• Bojja Divya
• Srinithi R.M
• Bhavatarini M
• Geetha Sri P
  (SENSE, VIT Chennai)

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