a problem about linear regulator

[gdhp]

hi all

i am designing a circuit. The power is 2.5v, adn the input signal level 2.5v with

25M. I want the output signal level is 1.5v.

can anyone give me some suggestion to perform the function?

Now i have some thought. one is that i use the linear regulator to transfer the 2.5v power to 1.5v.

Another is use the source follower.

some suggestion? some materials?
Thanks!!

 

[Humungus]

It depends on the accuracy of the needed 1.5V and in the possible variations of your 2.5 power supply. If the 2.5V supply is stable, you can just use a divider (transistor made or resistive) to achieve the 1.5V and to buffer that voltage to be able to source or sink some current.

If the 2.5V is not very stable, you must first generate a reference voltage and build from it your 1.5V with a regulator architecture.

 

[gdhp]

thank you Humungus

i think you mean the charge pump structure??
the 1.5v we need is not very accurate.

so any suggestion?

 

[leotim]

so you can use a resistive voltage divider.

but what is your output current and how much the power efficiency is important?

 

[sunking]

how about full diff. op+ cmfb?

 

[gdhp]

how about full diff. op+ cmfb?

can you explain it?