Particle beam measuring method for non-contact testing of interconnect networks
First Claim
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1. A particle beam measuring method for non-contact testing of an interconnect network for shorts and opens, comprising the steps of:
- measuring reference signals at uncharged contact points before charging at least one point of the interconnect network, and intermediately storing the reference signals;
charging said at least one point of the interconnect network during a first time span by use of a particle beam of given energy directed to the at least one point;
subsequently directing the same particle beam with the same given energy to at least one further point of the same interconnect network; and
determining a potential at said at least one further point during a second time span by a measurement of secondary electrons emitted from said at least one further point, said second time span being significantly shorter in comparison to said first time span and the energy of said particle beam having the same value during both the first and second time spans.
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Abstract
For testing an interconnect network for shorts and interruptions, a point of the network to be tested is charged with a particle beam. Subsequently, a potential at least one further contact point is read with the same particle beam and an unaltered primary energy. An identification of potential occurs by documenting the secondary electrons triggered at the contact points. In order to avoid a disturbing change of potential during the measuring phase, the measuring time is only a fraction of the time for charging the network.
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Citations
16 Claims
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1. A particle beam measuring method for non-contact testing of an interconnect network for shorts and opens, comprising the steps of:
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measuring reference signals at uncharged contact points before charging at least one point of the interconnect network, and intermediately storing the reference signals; charging said at least one point of the interconnect network during a first time span by use of a particle beam of given energy directed to the at least one point; subsequently directing the same particle beam with the same given energy to at least one further point of the same interconnect network; and determining a potential at said at least one further point during a second time span by a measurement of secondary electrons emitted from said at least one further point, said second time span being significantly shorter in comparison to said first time span and the energy of said particle beam having the same value during both the first and second time spans.
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2. A particle beam measuring method for non-contact testing of an interconnect network for shorts and interruptions, comprising the steps of:
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charging at least one point of the interconnect network to a specific voltage potential during a first time duration of predetermined length by directing a particle beam of given energy to the at least one point; measuring a voltage potential of at least one further point of the same interconnect network by directing a particle beam having an energy which is the same as an energy of the particle beam charging the at least one point for a second time duration whose length is substantially shorter in comparison to the first time duration length; comparing the voltage potential at an end of the second time duration at said at least one further point with a reference potential; and said reference potential being a voltage potential at said at least one further point determined in a calibration sequence before charging said at least one point.
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3. A particle beam measuring method for non-contact testing of an interconnect network for shorts and interruptions, comprising the steps of:
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charging at least one point of the interconnect network to a specific voltage potential during a first time duration of predetermined length by directing a particle beam of given energy to the at least one point; measuring a voltage potential of at least one further point of the same interconnect network by directing a particle beam having an energy which is the same as an energy of the particle beam charging the at least one point for a second time duration whose length is substantially shorter in comparison to the first time duration length; comparing the voltage potential at an end of the second time duration at said at least one further point with a reference potential; and said reference potential comprising a voltage potential at a reference point in the interconnect network determined in a calibration sequence before charging said at least one point of the interconnect network. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification