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how to do level shift

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crystalc

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I want to get a lower voltage than input, how to do the level shift?
For example: the input voltage is about 5v, but I want to use it at 2.5v.

thanks.
 

You can use voltage divider (by 2) build of 2 identical resistors .. the values depend on input and output imedances of both stages ..
Regards,
IanP
 

I think just two inverter is ok.
the first inverter must use the transistor which can use under 5V gate voltage.
and the vdd of both should be 2.5v.
 

You can use buck converter, then the duty is 50%.
 

use bipolar, and common collector
 

For analog design:
If the process is cmos , i think the soure follows can be used.
If the bipolar process, the emitter follows can be used.

For digital design:
The 2.5v power supply has to be need, and a cross-coupling feedback is to supply what you want.
 

hi
I think that the voltage divider is load sensitive.
use an OP-AMP whit proper gain (k);
 

you can use the linear voltage regulator.
its performance is very good!
 

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