Method and apparatus for calibrating and/or deskewing communications channels
First Claim
1. A probe card comprising:
- a plurality of probes disposed to contact terminals of an electronic device to be tested;
means for electrically connecting ones of said probes to a source of test signals; and
circuitry configured to process a composite signal comprising a combination of calibration signals received at said probe card from said source of test signals and driven through ones of said probes into input terminals of a calibration substrate, said composite signal received at said probe card through a calibration probe disposed to contact an output terminal of said calibration substrate.
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0 Petitions
Accused Products
Abstract
A series of pulses may be driven down each drive channel, which creates a series of composite pulses at the output of the buffer. Each composite pulse is a composition of the individual pulses driven down the drive channels. Timing offsets associated with the drive channels may be adjusted until the individual pulses of the composite pulse align or closely align. Those timing offsets calibrate and/or deskew the drive channels, compensating for differences in the propagation delays through the drive channels. The composite pulse may be feed back to the tester through compare channels, and offsets associated with compare signals for each compare channel may be aligned to the composite pulse, which calibrates and/or deskews the compare channels.
27 Citations
19 Claims
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1. A probe card comprising:
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a plurality of probes disposed to contact terminals of an electronic device to be tested; means for electrically connecting ones of said probes to a source of test signals; and circuitry configured to process a composite signal comprising a combination of calibration signals received at said probe card from said source of test signals and driven through ones of said probes into input terminals of a calibration substrate, said composite signal received at said probe card through a calibration probe disposed to contact an output terminal of said calibration substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A probe card comprising:
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a plurality of probes disposed to contact terminals of an electronic device to be tested; an electrical connection configured to receive test signals from a tester; means for electrically connecting ones of said probes to said test signals; a data storage device configured to store data representing deskewing offsets for said probe card, wherein said deskewing offsets correspond to an improved alignment of the test signals through said probe card. - View Dependent Claims (19)
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Specification