How To Draw A 3 Bit Adder Schematic

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How to draw the layout of Half adder

• Thread starter vlsitechnology
• Start date Feb 13, 2008

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half adder schematic

Tin anyone tell me the details of drawing the layout of one-half adder?

Added after 45 seconds:

I need to know the details without taking the spice levelnetlist
I mean with the assistance of boolean expression how can we draw the layout

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half adder layout

Its quite simple. The equations for sum and deport are

sum = a xor b
bear = a and b

assuming a and b are inputs.

To implement xor:

sum = a xor b. CMOS logic is inverting logic. Then you tin do it this way.

sum = a xor b = (a xnor b)`

a xnor b = a`b` + ab

sum = (a`b` + ab)`

separate a`b` as (a+b)'

sum = ((a+b)' + ab)'

This can be implemented using an OR gate and AOI 12 gate.

The deport would be an and gate.

Let me know if you need any further information.

-Aravind

Added later 9 minutes:

This is the schematic

Added afterward 1 minutes:

You tin can probably work your fashion through the layout with the schematic. Permit me know if you lot have any doubts with the layout.

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cmos half adder

Dearest VLSI technology,

U r asking how to draw a layout of one-half adder.

Fine u need a layout tool.

u need a transistor level(CMOS level) design of the half adder.

That cmos should be of sure applied science.

Then it cmos level transistor should be designed properly like consedering its

parameters such that we should get any violations.

if nosotros get nosotros need to adjust.

If we get certain width, in layout we demand to keep the polysilicon surface area of that width.

then get-go layout by placing agile north- well p diffusion, bulk connection, keep the lenght according to technology and width u designed then connect drain source gate equally per requrinment and then connect VDD, VSS , then connet onter connection and then tap out i/o ports , finally create a abutment box ant if u desire identify in library place.

hope u understand
santu

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half adder circuit using cmos

use orcad, make schematic of whatever you want (gates but), create the verilog file .

using mirowind you can convert the verilog file into the layout !

savour !

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