DVM - Design Verification Module

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 ▶Source ▶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
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.