Arbitrary waveform generator
- Arbitrary waveform generator
An arbitrary waveform generator (AWG) is a piece of electronic test equipment used to generate electrical waveforms. These waveforms can be either repetitive or single-shot (once only) in which case some kind of triggering source is required (internal or external). The resulting waveforms can be injected into a device under test and analyzed as they progress through the device, confirming the proper operation of the device or pinpointing a fault in the device.
Unlike function generators, AWGs can generate any arbitrarily defined waveshape as their output. The waveform is usually defined as a series of "waypoints" (specific voltage targets occurring at specific times along the waveform) and the AWG can either jump to those levels or use any of several methods to interpolate between those levels.
For example, a 50% duty cycle square wave is easily obtained by defining just two points: At t0, set the output voltage to 100% and at t50%, set the output voltage back to 0. Set the AWG to jump (not interpolate) between these values and the result is the desired square wave. By comparison, a triangle wave could be produced from the same data simply by setting the AWG to linearly interpolate between these two points.
Because AWGs synthesize the waveforms using digital signal processing techniques, their maximum frequency is usually limited to no more than a few megahertz. The output connector from the device is usually a BNC connector and requires a 50 or 75 ohm termination.
AWGs, like most signal generators, may also contain an attenuator, various means of modulating the output waveform, and often contain the ability to automatically and repetitively "sweep" the frequency of the output waveform (by means of a voltage-controlled oscillator) between two operator-determined limits. This capability makes it very easy to evaluate the frequency response of a given electronic circuit.
Some AWGs also operate as conventional function generators.
AWGs may also be contained within musical synthesizers.
Digital electronics engineers sometimes refer to 'digital patterns' as 'waves' or 'waveforms'. Hence, an 'Arbitrary Digital Waveform Generator' can refer to a Digital Pattern Generator, another type of Signal generator
See also
* Signal generator
* Digital Pattern Generator
* Electronic musical instrument
External links
* [http://lukeb.members.sonic.net/arb_project/docs/arb_main_project.html Step-by-Step Guide to Build an AWG]
* [http://www.edn.com/article/CA46108.html Soundcard to AWG]
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