Analog Layout and Digital ?

[truebs]

hi friends...

can some one explain me what does Analog Layout Design mean ?

Is it related to analog electronics or Digital also ?

and if its related to Digital technology (say VLSI) ,what it implies there ?

Thanks !!!

 

[vijay.kumarreddy]

analog layouts deals with matching ...... the main contraints are the area and mtching.

In digital layouts the main constraints are the clock signals data signal and control signal routing to reduce the skew problems.Area and matchins are not a constraint

 

[zkkbmy]

When you do some signal analog layout, the matching and shielding should be considered, and when you do some power analog layout, the safe of the device should be considered.

By the way many tools can help you do some digital layout but analog layout design is a art which more depend on the designer's experience.

 

[vijay.kumarreddy]

1) In the layout of a digital transistor the speed, the load driving
capability and the area optimization are key issues.

2) Matching, accurate aspect ratio (W/L), noise are not very
important.

3) In the layout of analog transistors it is important to:
i) have an accurate aspect ratio (straight structures)

ii) minimise the stray resistance in series with source and drain

iii)reduce the gate series resistance

 

[YESH_23]

analog can also be...

to reduce the mismatch between matched devices....

more current flows in this block...

it occupies more area....

 

[beckchm]

analog is more rigious than digital

 

[suthan]

please go through Alan hastings book

 

[omsi]

hi all,

the very goal of a analog design decribes the difference between them.
in digital design,we need faster switching .so sacrifice the power.
but in analog we need the both.
faster operation and high power at high frequencies.
thats why analog design is more difficult than digital.

 

[yaxazaa]

analog layout mostly is customer design using human hand manualy, digital design is place rounter is standard cell design using tools automatically

 

[ilotfy]

analog layout ASIC (Application Specific Integrated Circuit) which mean the design is done manually and not automatically like FPGA in digital design if u want more information u can read the book name Advanced Analog VLSI Circuit Design. Phillips