Voltage regulator design

how to design Analog to Digital IC voltage regulator?

what kind of question is this ?

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do you mean Analog to digital conveter ? or Analog voltage regulator ?

wanna convert analog voltage to digital voltage in CMOs ICs.
Any good reference would be appreciable

Usually an analog voltage could have any value between two limits Vmax and Vmin (Vmax > Vmin, but Vmax and/or Vmin can be positive or negative).
A digital value could have two levels high and low or state 1 and state 0. In general (not always), a high level is close to Vcc and the low level is close to ground.

Therefore to design the proper converter, the following parameters need to be specified first:

On the analog side, Vmax, Vmin and Vmid, if Vmid is supposed not to be equal to (Vmax+Vmin)/2.

On the digital side, Vcc (or Vhigh and Vlow).

Do you mean how to make an ADC ? (analog digital converter)
Or how to convert an analog signal that is 20 uV to 100 uV for instance to 0-5V ?

Like KerimF allready wrote, you need to define first your demands.
Then convert the analog signal to usefull levels (amplify, shift, attenuate, invert etc)

Then you need someting that converts that signal in digital information.
You can do that by converting a voltage in to time of frequency and make or just buy an ADC for that.
Look for VF converters, or for instance dual slope ADCs, they are fun to build as an experiment.

- - - Updated - - -

Do you mean how to make an ADC ? (analog digital converter)
Or how to convert an analog signal that is 20 uV to 100 uV for instance to 0-5V ?

Like KerimF allready wrote, you need to define first your demands.
Then convert the analog signal to usefull levels (amplify, shift, attenuate, invert etc)

Then you need someting that converts that signal in digital information.
You can do that by converting a voltage in to time of frequency and make or just buy an ADC for that.
Look for VF converters, or for instance dual slope ADCs, they are fun to build as an experiment.