Method for accurate output voltage testing
First Claim
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1. A method for testing an integrated circuit comprising:
- applying a reference voltage to a first input of a differential comparator located on the integrated circuit;
injecting a current at an I/O pad of the integrated circuit, wherein the I/O pad is coupled to a second input of the differential comparator;
enabling an output buffer, wherein an output of the output buffer is coupled to the I/O pad; and
comparing a voltage level of the first input of the differential comparator with a voltage level of the second input of the differential comparator.
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Abstract
A method for accurate testing of the output voltage of an integrated circuit comprises enabling a differential voltage comparator on the integrated circuit to be tested. One input to the differential comparator is set to a reference voltage, and the other input is coupled to a node to be tested. A current load is injected at the node, and the output of the voltage comparator can be used to determine if the integrated circuit performs within the specifications set by a manufacturer.
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Citations
21 Claims
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1. A method for testing an integrated circuit comprising:
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applying a reference voltage to a first input of a differential comparator located on the integrated circuit;
injecting a current at an I/O pad of the integrated circuit, wherein the I/O pad is coupled to a second input of the differential comparator;
enabling an output buffer, wherein an output of the output buffer is coupled to the I/O pad; and
comparing a voltage level of the first input of the differential comparator with a voltage level of the second input of the differential comparator. - View Dependent Claims (2, 3, 4)
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5. A test configuration for testing an integrated circuit comprising:
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a differential comparator located on the integrated circuit, having first and second inputs;
a reference voltage source coupled to the first input of the differential comparator;
a current source coupled to the second input of the differential comparator; and
an output buffer of the integrated circuit coupled to the second input of the differential comparator. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for testing a programmable logic device comprising:
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enabling a differential amplifier input of an I/O block of the programmable logic device;
enabling an output buffer of the I/O block, the output buffer having an output coupled to a first input of the differential amplifier input;
applying a reference voltage source to a second input of the differential amplifier input; and
injecting a current at the first input of the differential amplifier input. - View Dependent Claims (20, 21)
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Specification