DC Input Impedance Source
The DC input impedance source injects a small signal AC voltage into the input during an AC analysis. For the POP and transient analyses, the small signal portion of the source is disabled and the source is modeled by a constant DC voltage and a source resistance.
This source also includes probes for both the POP/Transient simulation, and a specially connected Impedance probe which plots the input impedance of the circuit under test.
| DVM Information | Power Supply (Non-DVM) Information | |
| Model Name | DC Input Impedance Source | |
| Simulator |
 This device is compatible with both the SIMetrix and SIMPLIS
simulators. |
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| Parts
Selector Menu Location |
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| 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_SOURCE_DC | POWER_SUPPLY_SOURCE_DC_IMPEDANCE |
| Symbols |
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| Schematic |
 Note: Power Supply probes will not have the "DVM" prefix.
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DC Input Impedance Source Parameters
The following table explains the relevant parameters.
| Parameter Name | Default | Data Type | Range | Units | Parameter Description |
| DC_VOLTAGE | 5 | Real | min:0 | V | DC voltage of input source |
| SOURCE_NAME | SRC | String | n/a | n/a | Name of the DVM source. This name cannot contain spaces. |
| SOURCE_RESISTANCE | 0.4 | Real | min:0 | Ω | Sets the source resistance of the source. |
| MEASURE_IMPEDANCE | 0 | Real | 0 or 1 | A flag used by DVM to measure the Impedance for this input source. This flag also enables the small signal AC source. When both MEASURE_IMPEDANCE and MULTI_TONE are equal to 1, the source is set to measure a Multi-Tone Input Impedance. | |
| MULTI_TONE | 0 | Real | 0 or 1 | Enables Multi-Tone AC analysis for this source. For small signal POP and AC analyses, this is set to 0. |
DC Input Impedance Source - DVM Multi-Tone AC Analysis
The following table summarizes the parameters used when a DVM Multi-Tone AC Analysis is specified. The source uses these parameters only if the MULTI_TONE property is set to 1.
| Parameter Name | Default | Data Type | Range | Units | Parameter Description |
| INJ_AMP | 10m | Real | V | The RMS injection amplitude for the Multi-Tone AC source included in this source. | |
| MEASURE_IMPEDANCE | 0 | Real | 0 or 1 | A flag used by DVM to measure the Impedance for this input source. This flag also enables the small signal AC source. When both MEASURE_IMPEDANCE and MULTI_TONE are equal to 1, the source is set to measure a Multi-Tone Input Impedance. | |
| MULTI_TONE | 0 | Real | 0 or 1 | Enables Multi-Tone AC analysis for this source. For small signal POP and AC analyses, this is set to 0. | |
| 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:
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| 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. |
Converting between DVM and Power Supply Sources
To change a Power Supply source to a DVM source, right click the symbol to bring up the context menu, and select the menu option: Upgrade to DVM Source/Load
To change a DVM source to a Power Supply source, right click the symbol to bring up the context menu, and select the menu option: Downgrade to SIMetrix/SIMPLIS Source/Load