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:

In this topic:

Model Name Pulse Input 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_PULSE
Symbols
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 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 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.

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Note: In the following testplans, the Load column is prefaced with the characters *?@ because it is the first column in the testplan.
*?@ 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