Predictive, adaptive power supply for an integrated circuit under test
First Claim
1. A method of testing a semiconductor device using a test apparatus, comprising:
- creating a demand record of expected input demand at a power terminal of the semiconductor device correlated in time with a test sequence for the semiconductor device;
testing the semiconductor device in accordance with the test sequence; and
providing during the testing power to the semiconductor device in accordance with the demand record, wherein the providing power comprises;
generating a first supply of power to the power terminal of the semiconductor device; and
selectively generating a second supply of power to the power terminal of the semiconductor device in accordance with the demand record such that the second supply of power is provided substantially concurrently with an expected increase in demand for current at the power terminal.
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Accused Products
Abstract
A main power source supplies current through path impedance to a power terminal of an integrated circuit device under test (DUT). The DUT'"'"'s demand for current at the power input terminal temporarily increases following edges of a clock signal applied to the DUT during a test as transistors within the IC switch in response to the clock signal edges. To limit variation (noise) in voltage at the power input terminal, an auxiliary power supply supplies an additional current pulse to the power input terminal to meet the increased demand during each cycle of the clock signal. The magnitude of the current pulse is a function of a predicted increase in current demand during that clock cycle, and of the magnitude of an adaption signal controlled by a feedback circuit provided to limit variation in voltage developed at the DUT'"'"'s power input terminal.
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Citations
12 Claims
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1. A method of testing a semiconductor device using a test apparatus, comprising:
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creating a demand record of expected input demand at a power terminal of the semiconductor device correlated in time with a test sequence for the semiconductor device; testing the semiconductor device in accordance with the test sequence; and providing during the testing power to the semiconductor device in accordance with the demand record, wherein the providing power comprises; generating a first supply of power to the power terminal of the semiconductor device; and selectively generating a second supply of power to the power terminal of the semiconductor device in accordance with the demand record such that the second supply of power is provided substantially concurrently with an expected increase in demand for current at the power terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A testing apparatus for a semiconductor device, comprising:
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a demand recorder for recording a demand record of expected input demand at a power terminal of the semiconductor device correlated in time with a test sequence for the semiconductor device; and a probe card configured to facilitate testing the semiconductor device in accordance with the test sequence; and power means for providing power to the semiconductor device in accordance with the demand record, wherein the power means comprises; a primary power supply for providing a supply of power to the power terminal of the semiconductor device; and an auxiliary power supply for providing an auxiliary supply of power to the power terminal in accordance with the demand record such that the auxiliary supply of power is provided substantially concurrently with an increase in demand for current at the power terminal. - View Dependent Claims (12)
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Specification