Rectifier and boost converter simulation in ads(RF energy harvesting)

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Kea123

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Hey everyone, I am currently working on a RF energy harvesting project. And I am using ADS to simulate my circuits, which is a voltage multiplier and a boost converter. have managed to simulate both circuits separately, and they work perfectly. However, I have a problem when i combine the two circuits the output of my boost converter becomes zero, and also the output of the voltage multiplier becomes very low, approaching zero. I tried using a buffer and a decoupling capacitor between the two circuts, but the system doesn't want to work still. (please note I am working at a very low power around -5dBm to 20 dBm).

And advice on how to solve the problem?

Thank you in advance
 

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