Functional at speed test system for integrated circuits on undiced wafers
First Claim
1. In a digital test system for functionally testing undiced integrated circuits or dies on wafers at relatively high test frequencies, the system having generator means for generating input signals to be applied to a die under test or DUT and also having analyzer means for analyzing response signals supplied by the DUT in response to the input signals to thereby determine if the DUT is functioning properly, the DUT including a plurality of contact pads arranged in a predetermined configuration, an improvement in combination therewith comprising:
- a probe card assembly including a plurality of printed circuit boards laminated together as a single laminated structure, a plurality of printed circuit patterns formed on the boards, a first one of the circuit patterns including a plurality of equal length and equal impedance elongated micro strip test signal traces, a second one of the circuit patterns including a relatively large reference plane which extends substantially over the test signal traces and is separated from the test signal traces by a uniform thickness of a circuit board to establish a uniform impedance per unit of length for the test signal traces, a third one of the circuit patterns including a power plane of a size approximately equal to the size or the reference plane, a probe ring having a plurality of resilient probes retained by a mounting ring in a pattern in which tips at one end of the probes are positioned to physically and electrically contact the contact pads of the DUT, the mounting ring attached to the laminated structure, an end of each of the probes opposite the tip electrically connected to the circuit patterns of the laminated structure, the connection end of a majority of the probes electrically connected to the ends of test signal traces, the connection end of each of a plurality of the remaining probes connected to at least one of the power plane and the reference plane, and a plurality of high frequency connectors attached to the laminated structure in electrical contact with the test signal traces at the end thereof opposite the end at which the connection ends are connected; and
interface means for electrically conducting the input signals from the generator means to the probe card assembly and for electrically conducting the response signals from the probe card assembly to the analyzer means, the interface means including a plurality of high frequency conductors electrically connected to the high frequency connectors of the probe card assembly for conducting the input and response signals to and from the DUT, respectively.
5 Assignments
0 Petitions
Accused Products
Abstract
A digital test system for functionally testing undiced ICs on wafers at relatively high test frequencies includes an improved probe card and interface assemblies. The probe card and interface assemblies each include a plurality of printed circuit boards laminated together as a single laminated structure. Equal length and equal impedance elongated micro strip test signal traces conduct the signals to and from a probe ring with a plurality of resilient probes physically and electrically in contact with the contact pads of the IC. Other circuit patterns includes a relatively large reference plane and a power plane of approximately equal size. The interface assembly performs selective I/O functions to electrically conduct input signals from a test signal generator to the probe card assembly and to electrically conduct response signals from the probe card assembly to the signal analyzer for determining the proper functionality of the IC. The printed circuit techniques assures a high degree of signal integrity, control over the signals at very high test frequencies, and efficiency in signal path routing.
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Citations
36 Claims
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1. In a digital test system for functionally testing undiced integrated circuits or dies on wafers at relatively high test frequencies, the system having generator means for generating input signals to be applied to a die under test or DUT and also having analyzer means for analyzing response signals supplied by the DUT in response to the input signals to thereby determine if the DUT is functioning properly, the DUT including a plurality of contact pads arranged in a predetermined configuration, an improvement in combination therewith comprising:
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a probe card assembly including a plurality of printed circuit boards laminated together as a single laminated structure, a plurality of printed circuit patterns formed on the boards, a first one of the circuit patterns including a plurality of equal length and equal impedance elongated micro strip test signal traces, a second one of the circuit patterns including a relatively large reference plane which extends substantially over the test signal traces and is separated from the test signal traces by a uniform thickness of a circuit board to establish a uniform impedance per unit of length for the test signal traces, a third one of the circuit patterns including a power plane of a size approximately equal to the size or the reference plane, a probe ring having a plurality of resilient probes retained by a mounting ring in a pattern in which tips at one end of the probes are positioned to physically and electrically contact the contact pads of the DUT, the mounting ring attached to the laminated structure, an end of each of the probes opposite the tip electrically connected to the circuit patterns of the laminated structure, the connection end of a majority of the probes electrically connected to the ends of test signal traces, the connection end of each of a plurality of the remaining probes connected to at least one of the power plane and the reference plane, and a plurality of high frequency connectors attached to the laminated structure in electrical contact with the test signal traces at the end thereof opposite the end at which the connection ends are connected; and interface means for electrically conducting the input signals from the generator means to the probe card assembly and for electrically conducting the response signals from the probe card assembly to the analyzer means, the interface means including a plurality of high frequency conductors electrically connected to the high frequency connectors of the probe card assembly for conducting the input and response signals to and from the DUT, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 13)
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9. In a digital test system for functionally testing undiced integrated circuits or dies on wafers at relatively high test frequencies, the system having generator means for generating input signals to be applied to a die under test or DUT and also having analyzer means for analyzing response signals supplied by the DUT in response to the input signals to thereby determine if the DUT is functioning properly, the DUT including a plurality of contact pads arranged in a predetermined configuration, an improvement in combination therewith comprising:
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a probe card assembly including a plurality of printed circuit boards laminated together as a single laminated structure, a plurality of printed circuit patterns formed on the boards, a first one of the circuit patterns including a plurality of equal length and equal impedance elongated micro strip test signal traces, a second one of the circuit patterns including a relatively large reference plane which extends substantially over the test signal traces and is separated from the test signal traces by a uniform thickness of a circuit board to establish a uniform impedance per unit of length for the test signal traces, a third one of the circuit patterns including a power plane of a size approximately equal to the size of the reference plane, a probe ring having a plurality of resilient probes retained by a mounting ring in a pattern in which tips at one end of the probes are positioned to physically and electrically contact the contact pads of the DUT, the mounting ring attached to the laminated structure, an end of each of the probes opposite the tip electrically connected to the circuit patterns of the laminated structure, the connection end of a majority of the probes electrically connected to the ends of test signal traces, the connection ends of each of a plurality of the remaining probes connected to at least one of the power plane and the reference plane, and a plurality of high frequency conductors attached to the laminated structure in electrical contact with the test signal traces at the end thereof opposite the end at which the connection ends are connected; and interface means for electrically conducting the input signals from the generator means to the probe card assembly and for electrically conducting the response signals from the probe card assembly to the analyzer means, the interface means including a plurality of high frequency conductors electrically connected to the high frequency connectors of the probe card assembly for conducting the input and response signals to and from the DUT, respectively; and
wherein;the first circuit pattern includes a power divider means formed by micro strip traces, the power divider means receiving a test clock signal having a predetermined frequency from the interface means and in response thereto supplying a pair of DUT clock signals of approximately equal power. - View Dependent Claims (10, 11, 12)
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14. In a digital test system for functionally testing undiced integrated circuits or dies on wafers at relatively high test frequencies, the system having generator means for generating input signals to be applied to a die under test or DUT and also having analyzer means for analyzing response signals supplied by the DUT in response to the input signals to thereby determine if the DUT is functioning properly, the DUT including a plurality of contact pads arranged in a predetermined configuration, an improvement in combination therewith comprising:
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a probe card assembly including a plurality of printed circuit boards laminated together as a single laminated structure, a plurality of printed circuit patterns formed on the boards, a first one of the circuit patterns including a plurality of equal length and equal impedance elongated micro strip test signal traces, a second one of the circuit patterns including a relatively large reference plane which extends substantially over the test signal traces and is separated from the test signal traces by a uniform thickness of a circuit board to establish a uniform impedance per unit of length for the test signal traces, a third one of the circuit patterns including a power plane of a size approximately equal to the size of the reference plane, a probe ring having a plurality of resilient probes retained by a mounting ring in a pattern in which tips at one end of the probes are positioned to physically and electrically contact the contact pads of the DUT, the mounting ring attached to the laminated structure, an end of each of the probes opposite the tip electrically connected to the circuit patterns of the laminated structure, the connection end of a majority of the probes electrically connected to the ends of test signal traces, the connection end of each of a plurality of the remaining probes connected to at least one of the power plane and the reference plane, and a plurality of high frequency connectors attached to the laminated structure in electrical contact with the test signal traces at the end thereof opposite the end at which the connection ends are connected; and interface means for electrically conducting the input signals from the generator means to the probe card assembly and for electrically conducting the response signals from the probe card assembly to the analyzer means, the interface means including a plurality of high frequency conductors electrically connected to the high frequency connectors of the probe card assembly for conducting the input and response signals to and from the DUT, respectively; and
wherein;the high frequency conductors of the interface means include interconnect conductors electrically connected to the high frequency connectors connected to the test signal traces of the probe card assembly, and the interface means comprises a plurality of selection switch means by which to selectively alternatively connect each interconnect conductor to either receive the input signal from the generator means or to transmit the response signal to the analyzer means. - View Dependent Claims (15, 16, 17)
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18. In a digital test system for functionally testing undiced integrated circuits or dies on wafers at relatively high test frequencies, the system having generator means for generating input signals to be applied to a die under test or DUT and also having analyzer means for analyzing response signals supplied by the DUT in response to the input signals to thereby determine if the DUT is functioning properly, the DUT including a plurality of contact pads arranged in a predetermined configuration, an improvement in combination therewith comprising:
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a probe card assembly including a plurality of printed circuit boards laminated together as a single laminated structure, a plurality of printed circuit patterns formed on the boards, a first one of the circuit patterns including a plurality of equal length and equal impedance elongated micro strip test signal traces, a second one of the circuit patterns including a relatively large reference plane which extends substantially over the test signal traces and is separated from the test signal traces by a uniform thickness of a circuit board to establish a uniform impedance per unit of length for the test signal traces, a third one of the circuit patterns including a power plane of a size approximately equal to the size of the reference plane, a probe ring having a plurality of resilient probes retained by a mounting ring in a pattern in which tips at one end of the probes are positioned to physically and electrically contact the contact pads of the DUT, the mounting ring attached to the laminated structure, an end of each of the probes opposite the tip electrically connected to the circuit patterns of the laminated structure, the connection end of a majority of the probes electrically connected to the ends of test signal traces, the connection end of each of a plurality of the remaining probes connected to at least one of the power plane and the reference plane, and a plurality of high frequency connectors attached to the laminated structure in electrical contact with the test signal traces at the end thereof opposite the end at which the connection ends are connected; clock means for generating a system clock signal at a predetermined frequency; and interface means for electrically conducting the input signals from the generator means to the probe card assembly and for electrically conducting the response signals from the probe card assembly to the analyzer means, the interface means further connected to the clock means and receptive of the system clock signal;
the interface means including a plurality of high frequency conductors electrically connected to the high frequency conductors of the probe card assembly for conducting the input and response signals to and from the DUT, respectively, directional coupler means for generating a coupled signal at the frequency of the system clock signal, and divider means receptive of the coupled signal and operative in response thereto for deriving a clock signal having a frequency which is an integer division of the frequency of the system clock signal, the interface means further electrically conducting the clock signal to the generator and analyzer means to synchronize operation of the generator means and the analyzer means. - View Dependent Claims (19, 20)
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21. A method of functionally testing undiced integrated circuits or dies on wafers at relatively high test frequencies using a digital test system having a generator for generating input signals to be applied to a die under test or DUT and also having an analyzer for analyzing response signals supplied by the DUT in response to the input signals to thereby determine if the DUT is functioning properly, the DUT including a plurality of contact pads arranged in a predetermined configuration, said method comprising the steps of:
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physically and electrically contacting the contact pads of the DUT with a plurality of resilient probes retained in a pattern in which tips at one end of the probes are positioned to align with the contact pads; laminating a plurality of printed circuit boards together as a single laminated structure in which a plurality of printed circuit patterns are formed on the boards; forming a plurality of equal length and equal impedance elongated micro strip test signal traces on a first one of the circuit patterns; forming a reference plane which extends substantially over the test signal traces and is separated from the test signal traces by a uniform thickness of a circuit board to establish a uniform impedance per unit of length for the test signal traces on a second one of the circuit patterns, the reference plane being relatively larger than the test signal traces; forming a power plane of a size approximately equal to the size of the reference plane on a third one of the circuit patterns; electrically connecting each of the probes at a connection end opposite the tip to the circuit patterns of the laminated structure, with a majority of the probes electrically connected to the ends of the test signal traces, and with a plurality of the remaining probes connected to at least one of the power plane and the reference plane; attaching a plurality of high frequency conductors to the laminated structure in electrical contact with the test signal traces at the end thereof opposite the end at which the connection ends of the probes are connected; electrically conducting input signals from the generator through the high frequency conductors to the test signal traces; and electrically conducting the response signals from the DUT to the analyzer through the high frequency conductors. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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28. A method of functionally testing undiced integrated circuits or dies on wafers at relatively high test frequencies using a digital test system having a generator for generating input signals to be applied to a die under test or DUT and also having an analyzer for analyzing response signals supplied by the DUT in response to the input signals to thereby determine if the DUT is functioning properly, the DUT including a plurality of contact pads arranged in a predetermined configuration, said method comprising the steps of:
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physically and electrically contacting the contact pads of the DUT with a plurality of resilient probes retained in a pattern in which tips at one end of the probes are positioned to align with the contact pads; laminating a plurality of printed circuit boards together as a single laminated structure in which a plurality of printed circuit patterns are formed on the boards; forming a plurality of equal length and equal impedance elongated micro strip test signal traces on a first one of the circuit patterns; forming a power divider on the first circuit pattern using micro strip traces; forming a reference plane which extends substantially over the test signal traces and is separated from the test signal traces by a uniform thickness of a circuit board to establish a uniform impedance per unit of length for the test signal traces on a second one of the circuit patterns, the reference plane being relatively larger than the test signal traces; forming a power plane of a size approximately equal to the size of the reference plane on a third one of the circuit patterns; electrically connecting each of the probes at a connection end opposite the tip to the circuit patterns of the laminated structure, with a majority of the probes electrically connected to the ends of the test signal traces, and with a plurality of the remaining probes connected to at least one of the power plane and the reference plane; attaching a plurality of high frequency conductors to the laminated structure in electrical contact with the test signal traces at the end thereof opposite the end at which the connection ends of the probes are connected; electrically conducting input signals from the generator through the high frequency conductors to the test signal traces; supplying a test clock signal having a predetermined frequency to the power divider; supplying a pair of DUT clock signals of approximately equal power by operation of the power divider in response to the test clock signal; and electrically conducting the response signals from the DUT to the analyzer through the high frequency conductors. - View Dependent Claims (29, 30, 31)
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32. A method of functionally testing undiced integrated circuits or dies on wafers at relatively high test frequencies using a digital test system having a generator for generating input signals to be applied to a die under test or DUT and also having an analyzer for analyzing response signals supplied by the DUT in response to the input signals to thereby determine if the DUT is functioning properly, the DUT including a plurality of contact pads arranged in a predetermined configuration, said method comprising the steps of:
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physically and electrically contacting the contact pads of the DUT with a plurality of resilient probes retained in a pattern in which tips at one end of the probes are positioned to align with the contact pads; laminating a plurality of printed circuit boards together as a single laminated structure in which a plurality of printed circuit patterns are formed on the boards; forming a plurality of equal length and equal impedance elongated micro strip test signals traces on a first one of the circuit patterns; forming a reference plane which extends substantially over the test signal traces and is separated from the test signal traces by a uniform thickness of a circuit board to establish a uniform impedance per unit of length for the test signal traces on a second one of the circuit patterns, the reference plane being relatively larger than the test signal traces; forming a power plane of a size approximately equal to the size of the reference plane on a third one of the circuit patterns; electrically connecting each of the probes at a connection end opposite the tip to the circuit patterns of the laminated structure, with a majority of the probes electrically connected to the ends of the test signal traces, and with a plurality of the remaining probes connected to at least one of the power plane and the reference plane; attaching a plurality of high frequency conductors to the laminated structure in electrical contact with the test signal traces at the end thereof opposite the end at which the connection ends of the probes are connected; generating a system clock signal at a predetermined frequency; utilizing a directional coupler for generating an coupled signal at the frequency of the system clock signal; supplying the coupled signal to a divider; deriving a clock signal from the divider in response to the coupled signal, the clock signal having a frequency which is an integer division of the frequency of the system clock signal; synchronizing the operation of the generator and analyzer by supplying the clock signal thereto; electrically conducting input signals from the generator through the high frequency conductors to the test signal traces; and electrically conducting the response signals from the DUT to the analyzer through the high frequency conductors.
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33. In a digital test system for functionally testing undiced integrated circuits or dies on wafers at relatively high test frequencies, the system having generator means for generating input signals to be applied to a die under test or DUT and also having analyzer means for analyzing response signals supplied by the DUT in response to the input signals to thereby determine of the DUT is functioning properly, the DUT including a plurality of contact pads arranged in a predetermined configuration, an improvement in combination therewith comprising:
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a probe card assembly including a plurality of printed circuit boards laminated together as a single laminated structure, a plurality of printed circuit patterns formed on the boards, a first one of the circuit patterns including a plurality of equal length and equal impedance elongated micro strip test signal traces, a second one of the circuit patterns including a relatively large reference plane which extends substantially over the test signal traces and is separated from the test signal traces by a uniform thickness of a circuit board to establish a uniform impedance per unit of length for the test signal traces, a third one of the circuit patterns including a positive power plane and a negative power plane which have a combined size approximately equal to the size of the reference plane, a probe ring having a plurality of resilient probes retained by a mounting ring in a pattern in which tips at one end of the probes are positioned to physically and electrically contact the contact pads of the DUT, the mounting ring attached to the laminated structure, an end of each of the probes opposite the tip electrically connected to the circuit patterns of the laminated structure, the connection end of a majority of the probes electrically connected to the ends of test signal traces, the connection end of each of a plurality of the remaining probes connected to one of the positive power plane, the negative power plane or the reference plane, the third circuit pattern also including a positive sensing conductor and a negative sensing conductor respectively extending from the positive and negative power planes at sensing points approximately at the location where the connection ends of the remaining probes connect to the power planes, and a plurality of high frequency connectors attached to the laminated structure in electrical contact with the test signal traces at the end thereof opposite the end at which the connection ends are connected; and integrated means for electrically conducting the input signals from the generator means to the probe card assembly and for electrically conducting the response signals from the probe card assembly to the analyzer means, the interface means including a plurality of high frequency conductors electrically connected to the high frequency connectors of the probe card assembly for conducting the input and response signals to and from the DUT, respectively. - View Dependent Claims (34)
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35. A method of functionally testing undiced integrated circuits or dies on wafers at relatively high test frequencies using a digital test system having a generator for generating input signals to be applied to a die under test or DUT and also having an analyzer for analyzing response signals supplied by the DUT in response to the input signals to thereby determine if the DUT is functioning properly, the DUT including a plurality of contact pads arranged in a predetermined configuration, said method comprising the steps of:
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physically and electrically contacting the contact pads of the DUT with a plurality of resilient probes retained in a pattern in which tips at one end of the probes are positioned to align with the contact pads; laminating a plurality of printed circuit boards together as a single laminated structure in which a plurality of printed circuit patterns are formed on the boards; forming a plurality of equal length and equal impedance elongated micro strip test signal traces on a first one of the circuit patterns; forming a reference plane which extends substantially over the test signal traces and is separated from the test signal traces by a uniform thickness of a circuit board to establish a uniform impedance per unit of length for the test signal traces on a second one of the circuit patterns, the reference plane being relatively larger than the test signal traces; forming a power plane of a size approximately equal to the size of the reference plane on a third one of the circuit patterns; electrically connecting each of the probes at a connection end opposite the tip to the circuit patterns of the laminated structure, with a majority of the probes electrically connected to the ends of the test signal traces, and with a plurality of remaining probes connected to at least one of the power plane and the reference plane; supplying electrical power to the power plane at a power supply location; including a sensing conductor in the third circuit pattern, the sensing conductor extending from the power plane at a sensing point located approximately where the connection ends of the probes are connected to the power plane, the sensing point located on the power plane at essentially the most remote location from the power supply location; attaching a plurality of high frequency conductors to the laminated structure in electrical contact with the test signal traces at the end thereof opposite the end at which the connection ends of the probes are connected; electrically conducting input signals from the generator through the high frequency conductors to the test signal traces; and electrically conducting the response signals from the DUT to the analyzer through the high frequency conductors.
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36. A method of functionally testing undiced integrated circuits or dies on wafers at relatively high test frequencies using a digital test system having a generator for generating input signals to be applied to a die under test or DUT and also having an analyzer for analyzing response signals supplied by the DUT in response to the input signals to thereby determine if the DUT is functioning properly, the DUT including a plurality of contact pads arranged in a predetermined configuration, said method comprising the steps of:
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physically and electrically contacting the contact pads of the DUT with a plurality of resilient probes retained in a pattern in which tips at one end of the probes are positioned to align with the contact pads; laminating a plurality of printed circuit boards together as a single laminated structure in which a plurality of printed circuit patterns are formed on the boards; forming a plurality of equal length and equal impedance elongated micro strip test signal traces on a first one of the circuit patterns; forming a reference plane which extends substantially over the test signal traces and is separated from the test signal traces by a uniform thickness of a circuit board to establish a uniform impedance per unit of length for the test signal traces on a second one of the circuit patterns, the reference plane being relatively larger than the test signal traces; forming a power plane of a size approximately equal to the size of the reference plane on a third one of the circuit patterns; electrically connecting each of the probes at a connection end opposite the tip to the circuit patterns of the laminated structure, with a majority of the probes electrically connected to the ends of the test signal traces, and with a plurality of the remaining probes connected to at least one of the power plane and the reference plane; attaching a plurality of high frequency conductors to the laminated structure in electrical contact with the test signal traces at the end thereof opposite the end at which the connection ends of the probes are connected; selectively alternatively connecting each of a plurality of high frequency conductors to either receive an input signal from the generator or to transmit a response signal to the analyzer; utilizing a plurality of selection switches by which to selectively alternatively connect each of the plurality of high frequency conductors; operatively controlling the operation of the generator and the analyzer by delivering control signals thereto; operatively controlling the selection switch to change the state of its selective alternative connection by delivering control signals thereto; electrically conducting the input signals to the DUT from the generator through the ones of the plurality of high frequency conductors connected to receive the input signal from the generator; and electrically conducting the response signals to the analyzer from the DUT through the ones of the plurality of high frequency conductors connected to transmit the response signal to the analyzer.
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Specification