eldo_user

Examples
Tutorial—High Impedance Fault Detection of a PLL Circuit
Figure 21-42. PLL Circuit for HiZ Fault Detection
Prerequisites
• Copy the hiz example directory into your working directory by entering the following
UNIX shell command:
cp -r $MGC_AMS_HOME/examples/hiz .
Procedure
1. The HiZ_PLL.cir main netlist file contains a measurement of PLL output period labeled
PERIOD_PLL. In the first part of the lab (steps 1 to 5) the PLL is not working and
therefore its output (net OUT400M) is flat 0.
Run Eldo on the netlist:
eldo HiZ_PLL.cir
After the simulation is complete, you will see the following message at the end of the
simulation (in the terminal and in the ASCII .chi output file):
PERIOD_PLL cannot be measured. Check your input netlist.
The netlist already contains the .hiz command to generate HiZ detection for all the
nodes that exceed 1e8 ohms and stores them in a dedicated high impedance detection
file named HiZ_ALL.hiz. Command:
Eldo® User's Manual, 15.3 1359