Integrated circuit with test interface
First Claim
1. Integrated circuit with a test interface, the integrated circuit comprising a supply pad;
- a functional block with a supply input;
a conductive connection between the supply pad and the supply input;
a current test circuit having test inputs coupled to a first and a second point along the conductive connection, for comparing a voltage across the test inputs with a threshold, the current test circuit comprising a threshold shifting circuit for shifting the threshold to a shifted value dependent on a voltage across the test inputs when the threshold shifting circuit is active;
wherein the test interface is connected to the threshold shifting circuit and the current test circuit, and the test interface provides for execution of a test command, the execution comprising at least the steps of making the threshold shifting circuit active when a first voltage is applied across test inputs and comparing a second voltage at the test input with the shifted threshold, one of the first and second voltage being a voltage drop across the connection when the integrated circuit is set to draw current along said connection, the other one of the first and second voltage being a reference voltage.
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Accused Products
Abstract
Integrated circuit with a test interface for testing a conductive connection between a supply pad and a supply of a functional block in the integrated circuit. A current test circuit has test inputs coupled to a first and a second point along the conductive connection, for comparing a voltage across the test inputs with a threshold. The current test circuit contains a threshold shifting circuit for shifting the threshold to a shifted value dependent on a voltage across the test inputs when the threshold shifting circuit is active. Testing is executed in two steps, making the threshold shifting circuit active when a first voltage is applied across test inputs and comparing a second voltage at the test input with the shifted threshold. One of the first and second voltage is a voltage drop across the connection when the integrated circuit is set to draw current along said connection, the other one of the first and second voltage is a reference voltage. In an embodiment the integrated circuit has a shunt circuit to provoke current through the conductive connection under test in parallel with current through the functional block.
55 Citations
15 Claims
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1. Integrated circuit with a test interface, the integrated circuit comprising
a supply pad; -
a functional block with a supply input;
a conductive connection between the supply pad and the supply input;
a current test circuit having test inputs coupled to a first and a second point along the conductive connection, for comparing a voltage across the test inputs with a threshold, the current test circuit comprising a threshold shifting circuit for shifting the threshold to a shifted value dependent on a voltage across the test inputs when the threshold shifting circuit is active;
wherein the test interface is connected to the threshold shifting circuit and the current test circuit, and the test interface provides for execution of a test command, the execution comprising at least the steps of making the threshold shifting circuit active when a first voltage is applied across test inputs and comparing a second voltage at the test input with the shifted threshold, one of the first and second voltage being a voltage drop across the connection when the integrated circuit is set to draw current along said connection, the other one of the first and second voltage being a reference voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. Method of testing an integrated circuit, wherein the integrated circuit comprises a supply pad, a functional block and a conductive connection between the supply pad and the functional block;
- the integrated circuit comprising a current test circuit having test inputs coupled to the conductive connection for comparing a threshold with a voltage drop along said conductive connection due to a supply current from the supply pad to the functional block, the method comprising at least the steps shifting the threshold dependent on a first voltage applied across test inputs and comparing a second voltage at the test input with the shifted threshold, one of the first and second voltage being a voltage drop across the connection when the integrated circuit is set to draw current along said connection, the other one of the first and second voltage being a reference voltage.
- View Dependent Claims (15)
Specification