cmos rectifier for high efficiency rf energy harvesting

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millinium

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hello everyone,
i'm having trouble with this the output of my 3 stage cmos rectifier is 0.4 with input vrf = 0.25V, then if i connect the rectifier to a non-overlapping and self-oscillating clock and a voltage doubler circuit the output of my rectifier becomes 0.16V and the final output of my voltage doubler is 0.5V..but if i change the rectifier into an ideal dc source which is also equal to 0.4V the final output of my voltage doubler becomes 1.6V..
please help me what to do to attain a final output of 1.6V using only the rectifier circuit not the ideal dc source your help would mean a lot to me
 

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