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How to calculate W/L ratio for rail to rail opamp?

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maori

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rail to rail opamp

im a newby...i trying to do a sample and hold ADC using rail to rail opamp.i have finsih up the construction base on one of the sample i found in internet.but there were no calcullation in W/L ratio.

if i want to learn how to calculate it...is there any good reference that anyone can share.

what i doing now with the W/L ratio is just by put a random value of it and see if it saturate or not.im using 0.35u.

if i want to increase the gain, which part should i increase in term of W/L in the opamp..what i heard is incerace it in input side ...i hope to know why.

is there any tips so that i can get as high gain as i can.
 

rail to rail op amp

hi!

use lower currents, they result in low power and higher gain. try 10 mA biasing currents. use this reference.


what software are you using? try plotting vgs-vt (for turn on of transistor) and vds-vdsat (for saturation) versus width. keep length at the minimum 0.35 um. you will find what width the transistor will turn on and be saturated.

- al
 

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