DVM - Design Verification Module

Pulse Load - Single Current Pulse

The Pulse Load - Single Current Pulse subcircuit models a single pulse in parallel with a resistive load. At time=0, the load starts at the resistive load. The load pulse is determined by the pulse parameters. You can configure any managed DVM load to a Ramp Pure Load with a Pulse() function call in the Load column of your testplan.

This load is used in the following test objectives:

Other similar loads include the following:

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Model Name

Pulse Load - Single Current Pulse

Simulator

This device is compatible with both the SIMetrix and SIMPLIS simulators.

Parts Selector
Menu Location

  • DVM ▶ Loads ▶ DVM Output Load - 2 Terminal
  • DVM ▶ Loads ▶ DVM Output Load - 3 Terminal
  • DVM ▶ Loads ▶ DVM Output Load - 4 Terminal

Symbol Library

None - the symbol is automatically generated when placed or edited.

Model File

SIMPLIS_DVM_ADVANCED.lb

Subcircuit Names
  • SIMPLIS_DVM_ADVANCED_LOAD_2T_PULSE
  • SIMPLIS_DVM_ADVANCED_LOAD_3T_PULSE
  • SIMPLIS_DVM_ADVANCED_LOAD_4T_PULSE
Symbols
Schematic - 2 Terminal

 

 

Schematic - 3 Terminal
Schematic - 4 Terminal

Parameters

The table below explains the parameters used in the Pulse Load - Single Current Pulse subcircuit.

Parameter Name

Default

Data Type

Range

Units

Parameter Description

FALL_TIME

50u

Real

min: 0

s

The pulse fall time in seconds

FINAL_CURRENT

750m

Real

min: 0

A

The final current for the PWL current source portion of the load. The Pulse Load - Single Current Pulse continues at this current for all simulation times greater than TIME_DELAY + RISE_TIME. This can be a numeric value or a symbolic value, such as a percentage of full load.

LOAD_NAME

LOAD

String

n/a

n/a

Name of the DVM load. This name cannot contain spaces.

LOAD_RESISTANCE

2.00667

Real

min: 0

Ω

The resistance value which models the starting current of the load

PULSE_CURRENT

250m

Real

min: 0 A The pulsed current in amps. The pulse current can be a numeric value or a symbolic value, such as a percentage of full load.

PULSE_WIDTH

200u

Real

min: 0

s The pulse width in seconds.

Note: DVM considers the pulse width to be the duration of the pulse at the PULSE_CURRENT.

RISE_TIME

100u

Real

min: 0

s

The pulse rise time in seconds

START_CURRENT

0

Real

min: 0

A

The starting current for the PWL current source portion of the load. This is typically set to 0 since the minimum load current is modeled with the LOAD_RESISTANCE parameter.

TIME_DELAY

10u

Real

min: 0

s

The time delay before the pulse initiates

Testplan Entry

To set any managed DVM load to a Pulse Load - Single Current Pulse subcircuit, place a Pulse() testplan entry in the Load column.

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

Pulse(REF, ISTART, IPULSE, IFINAL)
Pulse(REF, ISTART, IPULSE, IFINAL, OPTIONAL_PARAMETER_STRING)

where:

Argument Range Description

REF

n/a

The actual reference designator of the DVM load or the more generic syntax of OUTPUT:n where n is an integer indicating a position in the list of managed DVM loads

ISTART

min: 0

The starting current for the load. In the Pulse load, the starting current is modeled with a resistor. This can be a numeric value or a symbolic value, such as a percentage of full load.

IFINAL

min: 0

The final current for the load. This can be a numeric value or a symbolic value, such as a percentage of full load.

OPTIONAL_PARAMETER_STRING

n/a

Parameter string with a combination of one or more timing parameters:

  • TIME_DELAY*
  • RISE_TIME*
  • FALL_TIME*
  • PULSE_WIDTH*

*    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.

DVM calculates the LOAD_RESISTANCE parameter from the $I_{START}$ argument and subtracts the equivalent starting current from the PWL portion of the load. The calculation for the LOAD_RESISTANCE parameter is based on the following:

Note: If the specified starting current is 0 and the load is configured by DVM using either a Pulse() function or the PulseLoad() test objective, DVM replaces the Pulse Load - Single Current Pulse subcircuit with a Pulse Load - Single Pure Current Pulse subcircuit. The Pulse Load - Single Current Pulse does not use a parallel resistance to model the starting current.

Timing

DVM sets the timing of the Pulse Load - Single Current Pulse in the PulseLoad() test objective. You can change the timing with a Pulse() function call by providing the timing parameters as an optional parameter string, which is the fifth argument to the Pulse() function call.

Symmetric Pulse Example

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

Note: In this example, the Load column is the first column in the testplan and, therefore, begins with the special three character sequence: *?@.

*?@ Load
Pulse(OUTPUT: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

ISTART (see note below)

Y1 IPULSE (see note below)
Y2 IPULSE (see note below)
Y3 IFINAL (see note below)

Note: The actual load current depends on the LOAD_RESISTANCE parameter and the actual time-varying load voltage. The $I_{START}$ current is modeled by a resistor defined by the LOAD_RESISTANCE parameter in the pulse load subcircuit. The PWL current source has points defined by the ramp-load START_CURRENT, PULSE_CURRENT, and FINAL_CURRENT parameter values.

Asymmetric Pulse Example

The following example sets the first DVM managed load to a Pulse Load - Single Current Pulse with a starting current of 1A, a pulse current of 5A, and a final current of 4.5A.

Note: The rise and fall times are not the same and the pulse does not have to return to the starting current value.

*?@ Load
Pulse(OUTPUT: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

ISTART (see note below)

Y1 IPULSE (see note below)
Y2 IPULSE (see note below)
Y3 IFINAL (see note below)

Note: The actual load current depends on the LOAD_RESISTANCE parameter and the actual time-varying load voltage. The $I_{START}$ current is modeled by a resistor with resistance LOAD_RESISTANCE, while the PWL current source has points defined by the START_CURRENT and FINAL_CURRENT parameter values.

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