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CMOS 4 bit adder

4. Project Description:

The goal is the design of a 4-bit adder. Inputs are two 4-bit numbers A & B. Output is 4-

bit sum and a carry.

5. Step-by-Step Description:

First Step:

- Start with the design of a minimum sized inverter, i.e., Lp = Ln = Lmin = 250 nm, and Wp

= Wn = Wmin = 350 nm. Simulate the circuit schematic. From the voltage transfer

characteristic, identify the switching voltage VM and the noise margins.

- Gradually increase the width of the PMOS transistor as multiple of Wn, i.e., use Wp =

2Wn, Wp = 3 Wn, …. etc until you reach a matched inverter. Verify that the inverter is

indeed matched by showing that VM ≈ VDD/2.

- The size of the PMOS transistor in the matched inverter will be used to specify the size

of all transistors in the CMOS logic gates of the full-adder.

Second Step:

- The full-adder circuit explained in class involves the following logical circuits:

- XOR

- AND

- OR

- Construct each of these CMOS logic circuits and size the transistors with accordance to

the matched inverter.

- Verify the correct functionality of each circuit through schematic level simulation.

- Construct each circuit on the layout level in L-Edit and verify correct functionality by

performing post-layout simulation.

- The layout of each circuit should be free of DRC except for density errors.

Third Step:

- Combine all the circuits designed and tested in step two to implement a full-adder.

- Verify correct functionality of the full-adder through schematic and post layout

simulations.

Fourth Step:

- Combine the four full-adders to construct a 4-bit adder.

- Verify the functionality of the 4-bit adder though schematic and post layout simulations.

6. Performance Measure:

- Choose an optimum test vector to test your design

Habilidades: Design Digital, Engenharia Elétrica, Eletrônica, Engenharia, Arquitetura de software

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ID do Projeto: #10495452

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microembedded

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Anthony989

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janagamsripurna

i completed [url removed, login to view] vlsi . i can do it for u... my thesis is related to this multipliers so i used adders in my thesis also...ece is my back ground

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