Analog signal level shifting

[mystery]

Hello to all

I am digital eng. and need assistance for some analog problems

Here is my problem
I need to level shift an 0 to 5V incoming analog signal to 2.5V down.

ie.
0V --> -2.5V,
2.5V --> 0V,
5V --> 2.5V

I can not do it a capacitor because i need dc coupling.

 

[sankudey]

In general a Emitter Folloer/Source Follower with Emitter resitance/source resistance will do that....but for MOS...as bias current is less u may have to put a high resistance at source....bor BJT it may be OK for shifting the level up to 2.5V down.....

sankudey

 

[on1aag]

Hi Mystery,

Try this.

on1aag.

 

[venkateshr]

opamp summer will do this . u can implement switched capacitor summer also. i