SPICE 1

Due September 29, 1997 in class. Do not be late to class since we will be reviewing for Exam I which will be held the next night.

Run the following simulations in P-SPICE using the D1N4148 diode model. Hand in all schematics, all output files, as well as the plots refereed to below. Make sure that the plots have titles and properly labeled axes and curves.

1. Set the DC operating point to 0.7V. What is the diode current at this voltage? What is the small signal computed by P-SPICE?
2. Plot a measurement of current vs. voltage across the diode using a DC sweep. Sweep from 0V to about 0.8V. Hand in linear and semilog plots.
3. How does the curve in (2) change with Temperature. Hand in a plot showing the currents for at least two different temperatures.
4. Perform an AC transient analysis of the voltage doubler discussed in class and shown in Figure 3.49 in the textbook. You are free to choose the input voltage parameters (though you should use an ac input) as well as the circuit values. How long does it take to converge to a solution? Approximately, what is the final voltage? Can you justify this result in terms of the inputs? Hand in a plot showing the transient solution.