how to do level shift

[crystalc]

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.

 

[IanP]

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

 

[rommelm]

You could use many level shifter available in the market.

The question that will matter is:
1. What frequency
2. What current load

try the AVC logic family of TI
https://focus-webapps.ti.com/genera...3260327&numRecords=25&submit.x=34&submit.y=11

Added after 1 minutes:

If you care for DC only, I suggest that you use DC-DC.

 

[extraord]

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.

 

[mpig09]

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

 

[wjx197733]

use bipolar, and common collector

 

[jiangwp]

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.

 

[smxx]

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

 

[limingchou]

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