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PSS parametric Analysis in rectifier design

SanHad

I am working on the design of an energy harvesting (rectifier) block for a passive RFID system working at 5.8GHz,as my PhD thesis. Currently I am working on a Dynamic Threshold Voltage Cancellation technique based on the paper entitled:  "High-Efficiency Differential-Drive CMOS Rectifier for UHF RFIDs", K. Kotani, et al., in IEEE JOURNAL OF SOLID-STATE CIRCUITS.

After several months of try, finally I could get a relatively correct response for rectifier PCE, using PSS analysis. As the rectifier circuit is quite nonlinear, in order to get the optimum PCE results I need to sweep the size of the mosfets, and based on another reference ("Power efficient multi-stage CMOS rectifier design for UHF RFID tags, Shu-Yi Wong", Chunhong Chen), there is actually an optimum ratio of transistors' sizes which maximizes the PCE.

Considering g= (µn*Wn)/(µp*Wp), while " µn" and " µp" are the electron and hole mobility of the NMOS and PMOS devices.


1. Now I would like to know how I can sweep this ratio as a parameter in PSS analysis. Is there a way which I can define this parameter g as a variable to sweep?

2. When I try to sweep the values of Wp and Wn seperately, it keeps getting the convergence error after a long simulation time. (Itried to change the Options but still no convergence)


I would be grateful to have your suggestions in this case.


Regards,
Sanaz

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  • SanHad
    Dear Andrew,

    Thank you for your response. I guess you are right about the multiple values of Wn and Wp which gives the same g, and at the moment I just need to find the value of g which maximizes the PCE. So the only parameter to sweep is actually the g, and when I could find the optimum ratio, then the sizes of Wn and Wp would be define later based on the load value of the circuit. But I just don't know how do I have to define this Paramset (Wn/Wp) in ADE L and then sweep it! I would be thankful for a more detailed explanation or a reference!

    Regards,
    Sanaz
Reply
  • SanHad
    Dear Andrew,

    Thank you for your response. I guess you are right about the multiple values of Wn and Wp which gives the same g, and at the moment I just need to find the value of g which maximizes the PCE. So the only parameter to sweep is actually the g, and when I could find the optimum ratio, then the sizes of Wn and Wp would be define later based on the load value of the circuit. But I just don't know how do I have to define this Paramset (Wn/Wp) in ADE L and then sweep it! I would be thankful for a more detailed explanation or a reference!

    Regards,
    Sanaz
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