DVM - Design Verification Module

Pulse Input Source - Repeating Pulse

The Pulse Source - Repeating Pulse subcircuit models a repeating pulsed voltage source. This source is not used in any test objectives, but you can set a source to use this subcircuit with a Pul() call in the Source column of your testplan.

Other similar pulsed voltage sources include:

Ramp Input Source - used when a single step or ramped voltage is required
Pulse Input Source - Single Pulse - a single pule
Pulse Source - Single Pulse w/ Exponential Decay - a single pulse with exponential rise and fall waveforms
Pulse Source - Repeating Pulse w/ Zero Rise and Fall Times - a repeating pulse with zero rise and fall times

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Pulse Source - Repeating Pulse Parameters
Testplan Entry for the Repeating Pulse Source
Examples

Model Name	Pulse Source - Single Voltage Pulse
Simulator		This device is compatible with both the SIMetrix and SIMPLIS simulators.
Parts Selector Menu Location	DVM ▶ Sources ▶ 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_PUL
Symbols
Schematic - 2 Terminal

Pulse Source - Repeating Pulse Parameters

The following table explains parameters used in the Repeating Pulse Source.

Parameter Name	Default	Data Type	Range	Units	Parameter Description
FALL_TIME	50u	Real	min: 0	s	The fall time of the source voltage pulse
FINAL_VOLTAGE	750m	Real		V	The pulse or final voltage for the source pulse. This can be a numeric value or a symbolic value, such as a percentage of full source
FREQUENCY	10k	Real	min: > 0	Hz	The frequency of the source pulse
IDLE_IN_POP	0	Real	0 or 1		If set to 0, the source voltage during the POP analysis is set to the START_VOLTAGE; otherwise the source will be active during the POP analysis.
SOURCE_NAME	SRC	String	n/a	n/a	Name of the DVM source. This name cannot contain spaces.
OFF_UNTIL_DELAY	0	Real	0 or 1		If set to 1, the source voltage will be the START_VOLTAGE until the time specified by TIME_DELAY. If set to 0, the value of TIME_DELAY is interpreted as a phase delay.
PHASE_ANGLE	90	Real		°	The phase angle of the voltage pulse, used only if the USE_PHASE parameter is 1.
PULSE_WIDTH	200u	Real	min: 0	s	The pulse width of the source, excluding the rise and fall times
RISE_TIME	100u	Real	min: 0	s	The rise time of the source voltage pulse
START_VOLTAGE	0	Real		V	The lower or starting voltage for the source voltage pulse. This can be a numeric value or a symbolic value, such as a percentage of nominal input voltage.
TIME_DELAY	10u	Real	min: 0	s	The delay before the source voltage pulse starts. The source behavior before the TIME_DELAY is determined by the OFF_UNTIL_DELAY parameter.
USE_PHASE	0	Real	0 or 1		If set to 1, the source is configured to use the phase angle supplied by the PHASE_ANGLE parameter.

Testplan Entry for the Repeating Pulse Source

To set any managed DVM source to a Repeating Pulse Source subcircuit, place a Pul() testplan entry in the Source column.

The Pul() testplan entry has the following syntax with the arguments taken from the list of parameters above.

Pul(REF, START_VOLTAGE, FINAL_VOLTAGE, FREQUENCY, RISE_TIME, FALL_TIME, PULSE_WIDTH)
Pul(REF, START_VOLTAGE, FINAL_VOLTAGE, FREQUENCY, RISE_TIME, FALL_TIME, PULSE_WIDTH, OPTIONAL_PARAMETER_STRING)

Argument	Range	Description
REF	n/a	The actual reference designator of the DVM source or the more generic syntax of INPUT:n where n is an integer indicating a position in the list of managed DVM sources.
START_VOLTAGE	n/a	The lower or starting voltage for the source voltage pulse
FINAL_VOLTAGE	n/a	The pulse or final voltage for the source pulse
FREQUENCY	min: > 0	The frequency of the source pulse
RISE_TIME	min: 0	The rise time of the source voltage pulse
FALL_TIME	min: 0	The fall time of the source voltage pulse
PULSE_WIDTH	min: 0	The pulse width of the source, excluding the rise and fall times
OPTIONAL_PARAMETER_STRING	n/a	Parameter string with any of the other parameters from the parameter table above*

* If multiple parameters are specified, join the parameter key-value pairs with a space, as shown in the examples below. The order of the parameter names does not matter.

Examples

The following examples set the first DVM managed source to a Repeating Pulse Source with a starting voltage of 0V and a final voltage of 5V. The timing parameters and the optional parameter strings are different for each example.

Zero Time Delay Example

Since the TIME_DELAY parameter is set to zero, the pulse begins with a START_VOLTAGE value of 0 at t=0.

*?@ Source
Pul(INPUT:1, 0, 5, 10k, 6u, 10u, 22u, TIME_DELAY=0)

The results of this testplan entry are shown below:

Time Delay Example

In this example, the TIME_DELAY parameter is set to 75us. Since the OFF_UNTIL_DELAY parameter is not specified, the TIME_DELAY is interpreted as a phase delay.

*?@ Source
Pul(INPUT:1, 0, 5, 10k, 6u, 10u, 22u, TIME_DELAY=75u)

The results of this testplan entry are shown below:

Time Delay Example With OFF_UNTIL_DELAY=1

In this example, the TIME_DELAY parameter is set to 75us, and the OFF_UNTIL_DELAY is set to 1; therefore, for simulation times less than the TIME_DELAY parameter,the source voltage is 0V, which is the value of the START_VOLTAGE argument.

*?@ Source
Pul(INPUT:1, 0, 5, 10k, 6u, 10u, 22u, TIME_DELAY=75u OFF_UNTIL_DELAY=1)

The results of this testplan entry are shown below: