DVM - Design Verification Module

Sawtooth Waveform Load

The Sawtooth Waveform Load subcircuit models a repeating Sawtooth waveform load current with a duty cycle of 99.9%. This load is not used in any test objectives, but you can set a load to use this subcircuit with a Saw() call in the Load column of your testplan.

Other similar loads include:

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Model Name

Sawtooth Waveform Load

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 Name
  • SIMPLIS_DVM_ADVANCED_LOAD_2T_SAW
  • SIMPLIS_DVM_ADVANCED_LOAD_3T_SAW
  • SIMPLIS_DVM_ADVANCED_LOAD_4T_SAW
Symbols
Schematic - 2 Terminal
Schematic - 3 Terminal
Schematic - 4 Terminal

Parameters

The following table explains the relevant parameters.

Parameter Name Default Data Type Range Units Parameter Description

FINAL_CURRENT

750m

Real

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

FREQUENCY

10k

Real

min: > 0 Hz The frequency of the load pulse

IDLE_IN_POP

0

Real

0 or 1   If set to 0, the load current during the POP analysis is set to the START_CURRENT; otherwise the load will be active during the POP analysis.

LOAD_NAME

LOAD

String

n/a

n/a

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

OFF_UNTIL_DELAY

0

Real

0 or 1   If set to 1, the load current will be the START_CURRENT 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 sawtooth waveform, used only if the USE_PHASE parameter is 1.

START_CURRENT

0

Real

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

TIME_DELAY

10u

Real

min: 0 s The delay before the load current pulse starts. The load 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 load is configured to use the phase angle supplied by the PHASE_ANGLE parameter.

Testplan Entry

To set any managed DVM load to a Sawtooth Load subcircuit, place a Saw() testplan entry in the Load column.

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

Saw(REF, START_CURRENT, FINAL_CURRENT, FREQUENCY)
Saw(REF, START_CURRENT,
FINAL_CURRENT, FREQUENCY, OPTIONAL_PARAMETER_STRING)

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

START_CURRENT n/a The valley or starting current for the sawtooth load current. This can be a numeric value or a symbolic value, such as a percentage of full load.
FINAL_CURRENT n/a The peak or final current for the sawtooth load current. This can be a numeric value or a symbolic value, such as a percentage of full load.
FREQUENCY min: > 0 The frequency of the sawtooth load
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 load to a Sawtooth Load with a starting current of 0A and a final current of 2.5A. 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 triangle wave begins with a START_CURRENT value of 0 at t=0.

*?@ Load
Saw(OUTPUT:1, 0, 2.5, 10k, 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 50us. Since the OFF_UNTIL_DELAY parameter is not specified, the TIME_DELAY is interpreted as a phase delay.

*?@ Load
Saw(OUTPUT:1, 0, 2.5, 10k, TIME_DELAY=50u)

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 50us, and the OFF_UNTIL_DELAY is set to 1; therefore, for simulation times less than the TIME_DELAY parameter, the load current is 0A, which is the value of the START_CURRENT argument.

*?@ Load
Saw(OUTPUT:1, 0, 2.5, 10k, TIME_DELAY=50u OFF_UNTIL_DELAY=1)

The results of this testplan entry are shown below:

 

 

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