eldo_user

Summary of Eldo commands used in this example:
• .MODEL—Model definition.
• .TRAN—Transient analysis.
• .PLOT—Plot simulator results.
Netlist Explanation
.MODEL M3 NMOS LEVEL=3 VTO=0.25V TOX=2.5N UO=600
Examples
Example 14—Charge Conservation in MOS Models
The above line describes the electrical parameters of the nmos model M3. This is an old level 3
model that does not conserve charge properly.
.MODEL M53 NMOS LEVEL=53 VTH0=0.25V TOX=2.5N U0=600
The above line describes the electrical parameters of the nmos model M53. This is a BSIM3
model, that conserves charge.
Simulation Results
In the simulation waveforms in Figure 21-25, V(3) is the result of the charge control model and
V(1) is the result of the capacitive model. For V(1) the error on the charge is accumulated and
error is increasing at each period. However, for V(3) there is no error on the charges.
Eldo® User's Manual, 15.3 1305