DVM - Design Verification Module

Cosine Waveform Source

The Cosine Waveform Source subcircuit models a time-varying source with a cosinusoidal voltage. At time=0, the source begins at the FINAL_VOLTAGE value and has a cosine function. The Cosine Waveform Source is not used in any test objectives, but you can change any source to a cosine source with a Cos() function call in a Source column.

Other similar sources include:

Sine Source - similar to the Cosine Waveform Source but with a sine function.

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Parameters
Testplan Entry
Examples

Model Name	Cosine 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_COS
Symbols
Schematic

Parameters

The following table explains the relevant parameters.

Parameter Name	Default	Data Type	Range	Units	Parameter Description
COEFFICIENT	0	Real			The damping coefficient for the cosinusoidal source voltage. If non-zero, the cosinusoidal source voltage amplitude will decay with a time constant equal to $\frac{1}{\text{COEFFICIENT}}$.
FINAL_VOLTAGE	750m	Real		V	The peak or maximum voltage for the source. 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 cosine waveform source
IDLE_IN_POP	0	Real	0 or 1		If set to 0, the source voltage during the POP analysis is set to the FINAL_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 $\frac{1}{2}\left(\text{START_VOLTAGE}+\text{FINAL_VOLTAGE}\right)$ 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 cosinusoidal waveform, used only if the USE_PHASE parameter is 1.
START_VOLTAGE	0	Real		V	The minimum or starting voltage for the cosine waveform source. 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 cosinusoid 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 Cosine Waveform Source subcircuit, place a Cos() testplan entry in a Source column.

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

Cos(REF, START_VOLTAGE, FINAL_VOLTAGE, FREQUENCY)
Cos(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 minimum or starting voltage for the cosine waveform 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 cosine 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 cosine waveform 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 three examples set the first DVM managed source to a Cosine Waveform Source with a minimum voltage of 0V and a peak voltage of 1V. The timing parameters and the optional parameter strings are different in each example.

Note: In all of the examples below, the Source column is the first column in the testplan and, therefore, begins with the special three character sequence: *?@.

Zero Time Delay Example

Since the TIME_DELAY parameter is set to zero in this example, the cosine wave begins with the FINAL_VOLTAGE value of 1V at t=0.

*?@ Source
Cos(INPUT:1, 0, 1, 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 25us. Since the OFF_UNTIL_DELAY parameter is not specified, the TIME_DELAY value is interpreted as a phase delay. This results in the same waveform as a Sine Waveform Source.

*?@ Source
Cos(INPUT:1, 0, 1, 10k, TIME_DELAY=25u)

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 25us, and the OFF_UNTIL_DELAY is set to 1; therefore, for simulation times less than the TIME_DELAY parameter, the source voltage is 0.5V, as determined by the following equation:
$\frac{1}{2}\left(\text{START_VOLTAGE}+\text{FINAL_VOLTAGE}\right)$

*?@ Source
Cos(INPUT:1, 0, 1, 10k, TIME_DELAY=25u OFF_UNTIL_DELAY=1)

The results of this testplan entry are shown below: