DVM - Design Verification Module

Square Waveform Source

The Square Waveform Source subcircuit models a repeating square wave source voltage with zero rise and fall times. This source is not used in any test objectives, but you can set a source to use this subcircuit with a Squ() call in the Source column of your testplan.

Other similar pulsed voltage sources include:

Pulse Source - Repeating Pulse - similar to the square waveform source but with configurable rise time, fall time, and duty cycle
Pulse Source - Repeating Pulse w/ Zero Rise and Fall Times - similar to the square waveform source but with a configurable duty cycle

Similar pulsed sources which have only a single pulse include:

Pulse Input Source - Single Pulse - a single voltage pulse source with the starting voltage modeled with a resistor.

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Parameters
Testplan Entry for the Square Waveform Source
Examples

Model Name	Square 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_SQU
Symbols
Schematic

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 source pulse. 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 voltage pulse, used only if the USE_PHASE parameter is 1.
START_VOLTAGE	0	Real		V	The lower or starting voltage for the source voltage pulse. 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 for the Square Waveform Source

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

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

Squ(REF, START_VOLTAGE, FINAL_VOLTAGE, FREQUENCY)
Squ(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 lower or starting voltage for the square-wave source. 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 maximum voltage for the square-wave source. 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 square-wave 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 Square Waveform Source with a starting voltage of 0V and a final voltage of 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 square wave begins with the FINAL_VOLTAGE value of 5 at t=0.

*?@ Source
Squ(INPUT:1, 0, 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 75us. Since the OFF_UNTIL_DELAY parameter is not specified, the TIME_DELAY is interpreted as a phase delay.

*?@ Source
Squ(INPUT:1, 0, 5, 10k, TIME_DELAY=75u)

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 75us, 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
Squ(INPUT:1, 0, 5, 10k, TIME_DELAY=75u OFF_UNTIL_DELAY=1)

The results of this testplan entry are shown below: