How I do to shifte/pass Vin=0-3V to Vout=6-9V ? 0 needs to be 6, 1-7, 2-8 and 3-9V?

[Fred556]

Hi,

could anyone give me an idea how I do this?


I have a Vin is going from 0V to 3V but to my system works I need him to go to 6V to 9V.

Any sugestions? I need to be linear, 0 correspond to 6; 0,5V to 6,5V ... and 3V to 9V..

He has to be with cmos technology.

I'm a beginner, so I apologise if the answer is obvious but I don't know.

Thanks in advance.

 

[barry]

It's not clear if you are designing a chip or a circuit. You could simply use an op amp as a summer, with one input set to 6VDC.

 

[Fred556]

I'm designing a circuit LDO but I don't have enough voltage so I need to increase it. But has to be linear...

 

[barry]

I don't have picture, but here's what you need: Take an opamp. Connect its output to its inverting input through a resistor, R. Connect the inverting input to ground through another resistor, R. (You've got a gain-of-2). Connect two resistors to the non-inverting input, say, 10K. Connect one of these resistors to your 0-3V source, connect the other resistor to +6V. 0-3 in==>6-9 out.

Pay attention to your source impedance-if that's very high you'll get some error.