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Changing Vth of MOSFET in spice

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neils_arm_strong

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spice vth

Hi,
Can someone tell me how to vary the threshold voltage of MOSFET in hspice.
Is it enough if i give a value for Vth0. I tried this

M1 d g s s w=x l=y vth0=z

But this kind of declaration is not changing the vth value.All this time i have been giving some substrate voltage and getting the required vth( body effect). Is there any easier way of doing this ? I am using the BSIM4 model for 65nm.
Any help would be appreciated.

Regards
 

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