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Definitions (302)
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prpg
(Pseudo- Random Pattern Generator) PRPGs are LFSRs that are sometimes used on the front end of BIST engines to generate pseudo-random patterns to be presented to a circuit under test.
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ac scan
Form of scan test application, where only the sample interval is required at the specified operating frequency in order to verify timing performance, as well as structural content. The scan data may be shifted at a different frequency (typically slower). AC scan allows slower testers to be utilized and does not place unnecessary constraints on the [..]
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active filter
An electronic filter that combines active circuit devices, usually operational amplifiers, with resistors and capacitors. Typically, active filters more closely match ideal filters than passive filters do.
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active load
A programmable circuit that acts as a pullup or pulldown load when connected to a DUT pin.
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active test site
An operational test site that has its tester channel numbers present in the test-programs pinlists. A multisite device test starts with all operational sites active. If a device fails, its site is deactivated.
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algorithm
A set of rules with a finite number of steps for solving a problem.
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aliasing
There are a number of different kinds of aliasing that can occur in BIST engines. The most commonly discussed type of aliasing occurs when two faults have a canceling effect in the signature register. In other words, two wrongs appear to make a right. Two other forms of aliasing are zeroing and overcounting the LFSR. Zeroing refers to the occurrenc [..]
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ambient level
The values of signals and noise that exist at a test location when the device under test is not active.
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amplitude modulation
The process in which the amplitude of a carrier wave is varied according to a specific law.
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