RF energy harvesting in cmos

[millinium]

i'm currently designing RF to DC converter that doesnt require external power supply..
i already have an rectifier design together with its out..
the thing is i need a differential circuit that combines and amplify the negative and positive rectified signals into a single rectified signal
without any external powersupply (Vdd) it should only have an input pins and output pin

PLEASE help me find a differential circuit like that,
tnx in advance and advance merry christmas all

here is my screenshots..

 

[FvM]

The question doesn't seem to make sense, you have a floating input source, so you can make either positive or negative output your common ground, which simply "combines negative and positive rectified signal".

 

[millinium]

The question doesn't seem to make sense, you have a floating input source, so you can make either positive or negative output your common ground, which simply "combines negative and positive rectified signal".

well i'm just asking if that circuit is really possible...or this one a differential circuit that has low voltage power supply(as low as possible) does it have a possible circuit design?