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The
DSP Lab Software consists of a set of Virtual Test Instruments designed
specifically for Soft Test's Fundamentals of Mixed Signal Testing course.
The DSP Lab software is included with the "Fundamentals of Mixed
Signal Testing" text book, and is used to provide a "Hands On"
programming experience throughout the training class. It helps visualize
the concepts associated with wave form generation, signal sampling and
signal analyses.
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The
Fouries Series function is used to create sine waves of various frequencies.
Harmonics and noise can also be added to the signal. Several predefined
signals are also available for analyses. Once a signal is defined it can
be viewed via the Oscilloscope.
The Oscilloscope Showing a Square Wave
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The
Oscilloscope is available for viewing wave forms. In this example a 1
kHz square wave is shown, notice the fundamental and each harmonic frequency
is show in a unique color.
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Signal sampling is an important step in the process of mixed signal testing. The Sampler function was designed to allow the user to experiment and visualize the results, via the oscilloscope.
The Oscilloscope showing Sample Points
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This
example shows the Sample Points for a 1 kHz sine wave, as define above
in the Sampler Window.
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The
Spectrum Analyzer displays signal data in the frequency spectrum. When
used in association with the Oscilloscope, a signal can be viewed in both
the Time and Frequency domains. This instrument also illustrates the effects
of various windowing functions.
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Signal
generation is an important step in the process of mixed signal testing.
The Sine Generator was designed to allow the student to experiment creating
sinewaves. This activity is similarly to using the AWG (arbitrary wave
form generator) of a mixed signal test system.
Wave Form Generation Data Points
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During the signal generation process the data points used to create the wave form are written to a file. This data can be compared to the data points shown in the Sine Generator window. This example shows data points used to construct the signal as seen in the Sine Generator Window above.
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The
Inverse FFT function offers a means of creating a signal via the frequency
spectrum, then viewing the results in the time spectrum using the Oscilloscope
The Oscilloscope showing IFFT Wave Form
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The
frequency data defined in the Inverse FFT function above is displayed
in the time domain using the Oscilloscope
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Many engineers find the DSP Lab software a very effective aid in understanding the complex issues associated with signal generation, signal sampling and signal analyses. It allows the user to experiment with various test concepts and methods in a safe environment and it eliminates the need for expensive test system time (often costing several hundred dollars per hour). This software is included with the text book "Fundamentals of Mixed Signal Testing" which is distributed in the training class, or it can be purchased separately.
Purchase
"Fundamentals of
Mixed Signal Testing" textbook
