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High Impedance Node Check
Setting Up An Analysis
High Impedance Node Check
The .HIZ/.DCHIZ commands or option ADIT_CHECK checks for circuit nodes in high
impedance state (Hi-Z nodes). Eldo detects circuit Hi-Z states by checking the dynamic
behavior of all nodes. This detection method works on any circuit topology and applies to all
device types.
Specify the node impedance quantity, IMP(), inside SOA, .EXTRACT/.MEAS, or
.PLOT/.PRINT/.PROBE commands. The IMP quantity cannot be used to define the value of a
component (R1 … value = IMP(Z) is not allowed). Specifying this quantity might have an
impact on simulation time if lots of impedances are requested.
Tip
You can view high impedance detections with the AMS Results Browser.
See Also
• .DCHIZ in the Eldo Reference Manual
• .HIZ in the Eldo Reference Manual
• .OPTION ADIT_CHECK in the Eldo Reference Manual
Related Topics
High Impedance Node Checks
Tutorial—High Impedance Fault Detection of a PLL Circuit
Power Analysis
The .POWER_ANALYSIS command enables you to analyze power consumption of a circuit
and its components over time. You can optionally define a time range and thresholds to narrow
down problematic subcircuits or devices. The results are displayed in the EZwave Power
Analysis dialog box. For further post-processing, use the EZwave interface and TCL commands
to perform, for example, a batch analysis on multiple simulations or time range.
The power analysis is fully hierarchical, which means that you can display all the circuit
components, showing the hierarchy, and filter accordingly down through the hierarchy.
The main purpose of this analysis is to help designers understand where and when the power is
dissipated inside a large circuit, or which part of a circuit is consuming more than a specified
threshold, or which subcircuits are consuming what power. You can analyze the power without
having to resimulate, everything is manipulated in the Power Analysis dialog box and you
perform your debugging tasks accordingly there.
This analysis provides an effective way to report power and current consumption. For designs
operating on battery supplies, power consumption and leakage issues are important. Advanced
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