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.

Model Name DC Input Impedance Source
Simulator This device is compatible with both the SIMetrix and SIMPLIS simulators.
Parts Selector
Menu Location		 DVM > Sources > DVM Input Source
Symbol Library None - the symbol is automatically generated when placed or edited.
Model File SIMPLIS_DVM_ADVANCED.lb
Subcircuit Name SIMPLIS_DVM_ADVANCED_SOURCE_DC_IMPEDANCE
Symbols
Schematic

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 - Multi-Tone AC Analysis

The following table summarizes the parameters used when a 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:
  • 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.