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Ring oscilator for 90nm tech and 1v supply?!

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savithru

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hello

I am designing the PLL for 90nm technlogy. The power supply is 1v.

Can I go for Ring type archtecture.

Is that current starved type gives any issues with 1v supply.


pls suggest me the type of VCO archtecture I can us with this 1v supply.


Also kinldy tell me the minimum length ( the length that the "designers geneally use") of the transistor I can use in the 90 nm technology.

pls reply soon.

savithru
 

of course u can use a ring oscilator with 1v supply. u ca search in IEEE to try to find some papers about this issue.
The minimu length in 90nm should be 90nm
 

hello sir..

Thanks for the reply..

but in analog design we usually use larger Length ( than that allowed) to avoid channel length modulaton. (I depends on (1+ lamda*VDS))

for ex. in 1.2 u tech.. analog designers will not use 1.2 um as the minimum lenth of the analog circuit rather they go for 3um or like that.

I want to know what is that typical lenth the most designers use. ( "what" times the 90nm)

savithru
 

Hi
ring oscillator (in 0.18u) can wok with 0.8v supply.
regards
 

savithru said:
hello sir..


but in analog design we usually use larger Length ( than that allowed) to avoid channel length modulaton. (I depends on (1+ lamda*VDS))

for ex. in 1.2 u tech.. analog designers will not use 1.2 um as the minimum lenth of the analog circuit rather they go for 3um or like that.

I want to know what is that typical lenth the most designers use. ( "what" times the 90nm)

savithru
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well, This is not always the case...

If you are designing for max Ft, you must use min length, otherwise what is the benifit of using smaller feature size anway,
long channel devices are typically used for bias circuitry when you dont need high frequency operation
 

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