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Simulation Results
Examples
Example 9—Transient and AC Analysis of a Switched Capacitor Low Pass Filter
Figure 21-18. Example 8—Simulation Results
Referring to the above results, the element sensitivity is the change in the output of interest (in
this case the voltage at node 4) due to a one unit change in the value of the element of interest
(for example r1) and the normalized sensitivity is the change in the output of interest due to a
one percent change in the value of the element of interest.
Looking at the sensitivity output in normalized sensitivity (volts/percent), it can be seen that the
output at node 4 is most sensitive to the voltage source v2 and also to the bf parameter in q1. As
a result, variation in these values causes a significant effect on the output voltage.
Example 9—Transient and AC Analysis of a
Switched Capacitor Low Pass Filter
Netlist file: tran_ac_switched.cir
This example deals with the transient and small signal AC analysis of an SC low pass filter
using the Z-domain switched capacitor macromodels. Notice the periodic AC response.
Summary of Eldo commands used in this example:
• .AC—AC analysis.
• .TRAN—Transient analysis.
Eldo® User's Manual, 15.3 1295