How to Plot Vth Vs L for RF input

[shaikss]

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]

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]

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.

 

[erikl]

I am giving ac input and so i can't use dc analysis.

... and so you can't get your plot :roll:

 

[shaikss]

... 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]

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]

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

 

[erikl]

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

I think the only chance is to use native MOSFETs, as I already told you in one of your former threads.

 

[steadymind]

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.