Pulse Auxiliary Source

The pulse input source can be used to pulse a voltage between two or three voltages. The source includes probes for both the source voltage and current.

In this topic:

Model Name Pulse Auxiliary Source
Simulator This device is compatible with both the SIMetrix and SIMPLIS simulators.
Parts Selector
Menu Location		 DVM > Sources > DVM Aux. 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_AUX_PULSE
Symbols
Schematic

Pulse Auxiliary 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 Auxiliary Source

To set any DVM Aux source to a Pulse Auxiliary 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 AUX source. 
START_VOLTAGE min: 0 The starting voltage for the source.
PULSE_VOLTAGE min: 0 The pulse voltage for the source.
FINAL_VOLTAGE min: 0 The final voltage for the source.
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.

Note: In the following testplans, the Load column is prefaced with the characters *?@ because it is the first column in the testplan.
*?@ Source
Pulse(V5, 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 DVM Aux Source with reference designator V5 to a Pulse Aux 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(V5, 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