A weird question about the simulatio result of ADS

Jan 18, 2007 1 Replies
H

Hello, everyone



I met a weird question when using ADS... We are simulating the I_D current in the NMOS's saturation region that V_DS>=V_GS - V_TH>=0.



We also computed the current with the equation that



1/2*u_n*C_ox*W/L*[V_GS - V_TH]^2*(1+lamda*VDS). But the computed results are 2X compared with the simulated results.

We get u_n, E_ox and T_ox directly from a 0.25 um parameter file for ADS, and computed C_ox= E_ox/ T_ox. And the other setting for the simulation is just the normal. So it is really werid to find that. Could you help to give some suggestions?



Thanks a lot!



Jacobus Jan. 18th, 2007



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You are using simplistic equations... while the simulator is using complicated regional numeric solutions.

...Jim Thompson

| James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
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