DVM - Design Verification Module

Sawtooth Waveform Source

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

Other similar sources include:

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Model Name

Sawtooth Waveform Source

Simulator

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

Parts Selector
Menu Location
  • DVM ▶Sources ▶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_SAW
Symbols
Schematic - 2 Terminal

Parameters

The following table explains the relevant parameters.

Parameter Name Default Data Type Range Units Parameter Description

FINAL_VOLTAGE

 750m Real   V The peak or final voltage for the sawtooth source voltage. This can be a numeric value or a symbolic value, such as a percentage of nominal input voltage.

FREQUENCY

 10k Real min: > 0 Hz The frequency of the source pulse

IDLE_IN_POP

 0 Real 0 or 1   If set to 0, the source voltage during the POP analysis is set to the START_VOLTAGE; otherwise the source will be active during the POP analysis.

SOURCE_NAME

 SRC String n/a n/a Name of the DVM source. This name cannot contain spaces.

OFF_UNTIL_DELAY

 0 Real 0 or 1   If set to 1, the source voltage will be the START_VOLTAGE 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_VOLTAGE

 0 Real   V The valley or starting voltage for the sawtooth source voltage. This can be a numeric value or a symbolic value, such as a percentage of nominal input voltage.

TIME_DELAY

 10u Real min: 0 s The delay before the source voltage pulse starts. The source 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 source is configured to use the phase angle supplied by the PHASE_ANGLE parameter.

Testplan Entry

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

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

Saw(REF, START_VOLTAGE, FINAL_VOLTAGE, FREQUENCY)
Saw(REF, START_VOLTAGE, FINAL_VOLTAGE, FREQUENCY, OPTIONAL_PARAMETER_STRING)

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 n/a The valley or starting voltage for the sawtooth source voltage. This can be a numeric value or a symbolic value, such as a percentage of nominal input voltage.
FINAL_VOLTAGE n/a The peak or final voltage for the sawtooth source voltage. This can be a numeric value or a symbolic value, such as a percentage of nominal input voltage.
FREQUENCY min: > 0 The frequency of the sawtooth source
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 source to a Sawtooth Source with a starting voltage of 0V and a final voltage of 2.5V. 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_VOLTAGE value of 0 at t=0.

*?@ Source
Saw(INPUT: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.

*?@ Source
Saw(INPUT: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 source voltage is 0V, which is the value of the START_VOLTAGE argument.

*?@ Source
Saw(INPUT: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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