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How to Plot Vth Vs L for RF input

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shaikss

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Hi Folks,

I have to plot Vth Vs L, Vth Vs W for my rectifier 4-T cell structure.
I am giving RF input.

How to plot Vth Vs L or W?

Thanks!
 

erikl

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Vth doesn't change very much, neither with L nor with W.
For a plot run a DC analysis and sweep L resp. W.
 

shaikss

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Vth doesn't change very much, neither with L nor with W.
For a plot run a DC analysis and sweep L resp. W.
I am giving ac input and so i can't use dc analysis.
 

shaikss

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... and so you can't get your plot :roll:
But I need Vth Vs W/L for analysis. I want to lower Vth by doing some biasing.
Not getting...how to do...confused:???:
 

erikl

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But I need Vth Vs W/L for analysis.
Then follow my suggestion above! Vth dependency on W/L (if any) doesn't care about an ac input signal.

I want to lower Vth by doing some biasing.
You can lower Vth (a little bit) by some forward biasing of the bulk -- if this is possible.
 

shaikss

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Then follow my suggestion above! Vth dependency on W/L (if any) doesn't care about an ac input signal.


You can lower Vth (a little bit) by some forward biasing of the bulk -- if this is possible.
erikl,

My designed rectifier is for low power application....that is, rectifier has to provide dc voltage for min 150mV.
In order to serve this purpose, I want to lower Vth, a little.
I thought of providing some dc bias to the gate of the mosfet. But again, I don't want to use external supply voltage because of some constraints.

I have attached my schematic.
Pls let me know what can be done in order to lower Vth without use of any external dc supply voltages.



Thanks in advance erikl
 

steadymind

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Vth variation with W/L is based on your DC operating point. You can plot that using a parametric sweep. As for reducing Vth, you need to try biasing your bulk, or use natives. Its a trade-off.
 

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