DVM - Design Verification Module

Pulse Input Source - Single Pulse

The pulse input source can be configured to pulse the input voltage between two or three voltages. This source is used in the PulseLine() Test Objective.

Other similar sources include:

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

In this Topic ShowHide

Pulse Input Source Parameters
Testplan Entry for the Pulse Input Source
Timing
Symmetric Pulse Example
Asymmetric Pulse Example

Model Name	Pulse Input 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_PULSE
Schematic

Pulse Input Source Parameters

The following table explains the relevant parameters.

Parameter Name	Default	Data Type	Range	Units	Parameter Description
FALL_TIME	50u	Real	min: 0	s	The fall time of the source
FINAL_VOLTAGE	12	Real		V	The final voltage of the source
PULSE_VOLTAGE	9	Real		V	The pulse voltage of the source
PULSE_WIDTH	200u	Real	min: 0	s	The time which the source voltage is the PULSE_VOLTAGE
RISE_TIME	100u	Real	min: 0	s	The pulse rise time in seconds
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
START_VOLTAGE	5	Real		V	The starting voltage for the source
TIME_DELAY	10u	Real	min: 0	s	The time delay before the pulse initiates

Testplan Entry for the Pulse Input Source

To set any managed DVM source to a Pulse Input Source subcircuit, place a Pulse testplan entry in the Source column.

The Pulse() testplan entry has the following syntax with the arguments explained in the table below.

Pulse(REF, START_VOLTAGE, PULSE_VOLTAGE, FINAL_VOLTAGE)
Pulse(REF, START_VOLTAGE, PULSE_VOLTAGE, FINAL_VOLTAGE, OPTIONAL_PARAMETER_STRING)

where:

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	min: 0	The starting voltage for the source. This can be a numeric value or a symbolic value, such as a percentage of the nominal source voltage.
PULSE_VOLTAGE	min: 0	The pulse voltage for the source. This can be a numeric value or a symbolic value, such as a percentage of the nominal source voltage.
FINAL_VOLTAGE	min: 0	The final voltage for the source. This can be a numeric value or a symbolic value, such as a percentage of the nominal source voltage.
OPTIONAL_PARAMETER_STRING	n/a	Parameter string with a combination of one or more timing parameters: TIME_DELAY* RISE_TIME* PULSE_WIDTH* FALL_TIME*

* If more than one parameter is specified, join the parameter key-value pairs with a space, as shown in the example below. The order of the parameter names does not matter.

Timing

The timing for the Pulse Source is determined by the following parameters.

TIME_DELAY
RISE_TIME
PULSE_WIDTH
FALL_TIME

Timing parameters can be assigned using the optional parameter string as shown in the following examples.

Symmetric Pulse Example

This example shows a symmetric pulse with equal rise and fall times. The final voltage is the same as the starting voltage.

*?@ Source
Pulse(INPUT:1, 1, 5, 1, TIME_DELAY=25u RISE_TIME=25u PULSE_WIDTH=100u FALL_TIME=25u)

The results of this testplan entry are shown below:

Annotation	Value
X0	TIME_DELAY
X1	TIME_DELAY + RISE_TIME
X2	TIME_DELAY + RISE_TIME + PULSE_WIDTH
X3	TIME_DELAY + RISE_TIME + PULSE_WIDTH + FALL_TIME
Y0	START_VOLTAGE
Y1	PULSE_VOLTAGE
Y2	PULSE_VOLTAGE
Y3	FINAL_VOLTAGE

Asymmetric Pulse Example

The following example sets the first DVM managed source to a Pulse Voltage Source, with a starting voltage of 1V, a pulse voltage of 5V and a final voltage of 4.5V. Note the rise and fall times are not the same and the pulse does not have to return to the starting voltage value.

*?@ Source
Pulse(INPUT:1, 1, 5, 4.5, TIME_DELAY=25u RISE_TIME=25u PULSE_WIDTH=75u FALL_TIME=50u)

The results of this testplan entry are shown below:

Annotation	Value
X0	TIME_DELAY
X1	TIME_DELAY + RISE_TIME
X2	TIME_DELAY + RISE_TIME + PULSE_WIDTH
X3	TIME_DELAY + RISE_TIME + PULSE_WIDTH + FALL_TIME
Y0	START_VOLTAGE
Y1	PULSE_VOLTAGE
Y2	PULSE_VOLTAGE
Y3	FINAL_VOLTAGE