System for digitizing and displaying analog signatures of integrated circuits
First Claim
1. An apparatus for developing, digitizing, and displaying analog signature information, comprising:
- means for developing an analog signature signal representative of the operating condition of a selected element of an electronic circuit;
means for converting said analog signature signal to test digital values and storing said test digital values;
means for developing and storing reference digital values for the same element as said selected element, wherein said same element is known to be operating properly;
means responsive to said stored digital values and said reference digital values, respectively, to produce reconstructed analog signatures therefrom which are substantially identical to analog signatures obtained directly from said selected element and said same element; and
means for simultaneously displaying said reconstructed signatures.
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Accused Products
Abstract
A semiconductor test instrument (12) provides an AC interrogating signal to an element under test, such as a single pin of an IC. Horizontal and vertical signals are developed and applied to a display (33) which produces an analog signature signal representative of the operating condition of the test element. The horizontal and vertical signals are converted to digital signals by an A-D converter (34) and stored in memory (39). An analog signature is also obtained from the same element as the test element but which is known to be good. The horizontal and vertical components of this signature are also converted into digital signals and stored in memory (42). The test and reference digital signals are then compared and those test digital signals which are different identified. The analog signatures corresponding to both the test and reference digital values are then reconstructed for display and superimposed, for viewing by an operator.
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Citations
15 Claims
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1. An apparatus for developing, digitizing, and displaying analog signature information, comprising:
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means for developing an analog signature signal representative of the operating condition of a selected element of an electronic circuit; means for converting said analog signature signal to test digital values and storing said test digital values; means for developing and storing reference digital values for the same element as said selected element, wherein said same element is known to be operating properly; means responsive to said stored digital values and said reference digital values, respectively, to produce reconstructed analog signatures therefrom which are substantially identical to analog signatures obtained directly from said selected element and said same element; and means for simultaneously displaying said reconstructed signatures. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for digitizing and displaying analog signature information which is representative of the operating condition of a selected element to be tested of an electronic circuit, comprising;
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means for converting analog signature information for said test element to corresponding test digital information, and storing said test digital information; means for storing reference digital information for said selected element, the reference digital information being from an element identical to said selected test element and which is known to be operating properly; and means for reconstructing analog signatures from said test digital information and said reference digital information and for simultaneously displaying said two analog signatures. - View Dependent Claims (14, 15)
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Specification