Impedance Load

The Impedance Load subcircuit models a resistive load with the AC small signal source and an impedance probe that is required to generate output impedance plots. In DVM, this load is used to generate the output impedance plots in the Impedance() Test Objective.

Other similar loads include the following:

In this topic:

  DVM Information Power Supply (Non-DVM) Information
Model Name Impedance Load
Simulator
Parts Selector
Menu Location
  • DVM > Loads > DVM Output Load - 2 Terminal
  • DVM > Loads > DVM Output Load - 3 Terminal
  • DVM > Loads > DVM Output Load - 4 Terminal
Power Supply Loads > Power Supply Load ( DC Current, Pulse, Bode, Zout... )
Symbol Library SIMPLIS_DVM_ADVANCED.sxslb power_supply_source_and_loads.sxslb
Model File SIMPLIS_DVM_ADVANCED.lb power_supply_source_and_loads.lb
Subcircuit Name
  • SIMPLIS_DVM_ADVANCED_LOAD_2T_RES_IMPEDANCE
  • SIMPLIS_DVM_ADVANCED_LOAD_3T_RES_IMPEDANCE
  • SIMPLIS_DVM_ADVANCED_LOAD_4T_RES_IMPEDANCE
POWER_SUPPLY_LOAD_RES_IMPEDANCE
Symbols
Schematic - 2 Terminal
Note: Power Supply probes will not have the "DVM" prefix.
Schematic - 3 Terminal
Note: Power Supply probes will not have the "DVM" prefix.
Schematic - 4 Terminal
Note: Power Supply probes will not have the "DVM" prefix.

Parameters

The following table explains the relevant parameters for the Impedance load using the small signal AC source.

Parameter Name Default Data Type Range Units Parameter Description
LOAD_NAME LOAD String n/a n/a Name of the DVM load. This name cannot contain spaces.
LOAD_RESISTANCE 2.00667 Real min: 0 The resistance value of the load
MEASURE_IMPEDANCE 0 Real 0 or 1   A flag used by DVM to measure the impedance of this load. This flag also enables the small signal AC source. When both MEASURE_IMPEDANCE and MULTI_TONE are equal to 1, the load is set to measure a multi-tone AC impedance.
MULTI_TONE 0 Real 0 or 1   Enables Multi-Tone AC analysis for this load. For small signal POP and AC analyses, this is set to 0.

Impedance Load Parameters - DVM Multi-Tone AC Analysis

The following table summarizes the parameters used when a Multi-Tone AC Analysis is specified. This load uses these parameters only if the MULTI_TONE property is set to 1.

Parameter Name Default Data Type Range Units Parameter Description
DC_VOLTAGE 5 Real n/a V The common mode voltage seen by the impedance probe included in this load. This parameter is used only in Multi-Tone mode.
INJ_AMP 10m Real   V The RMS injection amplitude for the multi-tone AC source included in this load
MEASURE_IMPEDANCE 0 Real 0 or 1     A flag used by DVM to measure the impedance of this load. This flag also enables the small signal AC source. When both MEASURE_IMPEDANCE and MULTI_TONE are equal to 1, the load is set to measure a Multi-Tone AC Impedance.
MULTI_TONE 0 Real 0 or 1   Enables Multi-Tone AC analysis for this load. For Multi-Tone AC Analysis, this  is set to 1.
N_PT 10 Real     The number of points per decade when the SWEEP_TYPE is 1 or 2. Unused when the SWEEP_TYPE is 0 or 1.
START_FREQ 1k Real   Hz The starting frequency for the Multi-Tone AC Analysis
STOP_FREQ 100k Real   Hz The ending frequency for the Multi-Tone AC Analysis
SWEEP_TYPE 1 Real 0, 1, 2 or 3    One of the following:
  • 0 = Single Frequency passed as START_FREQ
  • 1 = Linear Sweep
  • 2 = Decade Sweep
  • 3 = Decade sweep with linear first decade
TIME_DELAY 10u Real   s The time delay for the AC Multi-Tone injection. This time delay is converted into a phase delay and is used to ensure that the Multi-Tone AC injection starts at the same phase angle where the FindAcSteadyState() test ended.

Output Curves

The Impedance output graph is shown below.

Converting between DVM and Power Supply Loads

To change a Power Supply load to a DVM load, right click the symbol to bring up the context menu, and select the menu option: Upgrade to DVM Source/Load

To change a DVM load to a Power Supply load, right click the symbol to bring up the context menu, and select the menu option: Downgrade to SIMetrix/SIMPLIS Source/Load