DVM - Design Verification Module

Ramp Input Source

The ramp input source applies a ramp or a step voltage to the input of the circuit under test. The rise time is controlled by the RISE_TIME parameter and the source includes probes for the source voltage and current. This source is used in the StepLine() Test Objective.

Other similar sources include:

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Model Name

Ramp Input Source

Simulator

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

Parts Selector
Menu Location

DVM ▶Source ▶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_RAMP
Schematic DVM Ramp Source

Ramp Input Source Parameters

The following table explains the relevant parameters.

Parameter Name Default Data Type Range Units Parameter Description

FINAL_VOLTAGE

12 Real min: 0 V The final voltage for the source

RISE_TIME

100u Real min: 0 s The ramp rise time in seconds

SOURCE_NAME

SRC String n/a n/a

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

SOURCE_RESISTANCE

0.4 Real min:0

Sets the source resistance of the source

START_VOLTAGE

5 Real min: 0 V The starting voltage for the source

TIME_DELAY

10u Real min: 0 s

The time delay before the ramp initiates

Testplan Entry

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

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

Ramp(REF, START_VOLTAGE, FINAL_VOLTAGE)
Ramp(REF, START_VOLTAGE, FINAL_VOLTAGE, OPTIONAL_PARAMETER_STRING)

Argument Range Description

REF

n/a

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

START_VOLTAGE

min: 0

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

FINAL_VOLTAGE

min: 0

The final voltage for the source. This can be a numeric value or a symbolic value, such as a percentage of the nominal input voltage.

OPTIONAL_PARAMETER_STRING

n/a

Parameter string with timing parameters TIME_DELAY and/or RISE_TIME*

 *   If both parameters are specified, join the two parameter key-value pairs with a space, as shown in the example below. The order of the parameter names does not matter.

Timing

During a StepLine() test, DVM sets the input to use the Ramp Source subcircuit. Then DVM sets the TIME_DELAY and RISE_TIME parameters for the Ramp Source. You can change the timing with the Ramp() function call by providing the timing parameters as an optional parameter string, which is the fourth argument to the Ramp() function call.

Example

The following example sets the first DVM managed source to a Ramp Source, with a starting voltage of 1V and a final voltage of 5V. The optional parameter string in this example sets the time delay to 25us and the rise time to 100us.

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

*?@ Source
Ramp(INPUT:1, 1, 5, TIME_DELAY=25u RISE_TIME=100u)

The results of this testplan entry are shown below:

Annotation Parameter Value
X0 TIME_DELAY
X1 TIME_DELAY + RISE_TIME
Y0

START_VOLTAGE

Y1 FINAL_VOLTAGE

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