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:

Bode Plot Load - Resistive Load - resistive load used for Bode Plot test objectives.
Bode Plot Load - Current Load - DC current load bode plot test objectives.

In this topic:

DVM Information

Power Supply (Non-DVM) Information

Model Name

Impedance Load

Simulator

This device is compatible with both the SIMetrix and SIMPLIS simulators.

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	Ω	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