Patents by Inventor Lakshmikanth Namburi
Lakshmikanth Namburi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10859602Abstract: Transferring electronic probe assemblies to space transformers. In accordance with a first method embodiment, a plurality of probes is formed in a sacrificial material on a sacrificial substrate via microelectromechanical systems (MEMS) processes. The tips of the plurality of probes are formed adjacent to the sacrificial substrate and the remaining structure of the plurality of probes extends outward from the sacrificial substrate. The sacrificial material comprising the plurality of probes is attached to a space transformer. The space transformer includes a plurality of contacts on one surface for contacting the plurality of probes at a probe pitch and a corresponding second plurality of contacts on another surface at a second pitch, larger than the probe pitch, wherein each of the second plurality of contacts is electrically coupled to a corresponding one of the plurality of probes. The sacrificial substrate is removed, and the sacrificial material is removed, leaving the plurality of probes intact.Type: GrantFiled: March 7, 2013Date of Patent: December 8, 2020Inventors: Lakshmikanth Namburi, Florent Cros
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Patent number: 9599665Abstract: A method for testing a semiconductor device is disclosed. The method comprises positioning a probe card comprising a plurality of probes above the semiconductor device and moving the probe card in a vertical direction towards the semiconductor device. The plurality of probes are moving in a vertical direction towards a plurality of electrical structures of the semiconductor device until each probe of the plurality of probes has made mechanical contact with a corresponding electrical structure of the plurality of electrical structures with a minimum quantity of force. The each probe of the plurality of probes absorbs a portion of vertical overdrive after contacting their corresponding electrical structures. The probe card absorbs any remaining vertical overdrive. The vertical overdrive is a continuing vertical movement of the plurality of probes after a first probe of the plurality of probes mechanically contacts a first corresponding electrical structure.Type: GrantFiled: May 21, 2013Date of Patent: March 21, 2017Assignee: ADVANTEST CORPORATIONInventors: Ting Hu, Lakshmikanth Namburi
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Patent number: 9335347Abstract: Disclosed herein is a cost effective, efficient, massively parallel multi-wafer test cell. Additionally, this test cell can be used for both single-touchdown and multiple-touchdown applications. The invention uses a novel “split-cartridge” design, combined with a method for aligning wafers when they are separated from the probe card assembly, to create a cost effective, efficient multi-wafer test cell. A “probe-card stops” design may be used within the cartridge to simplify the overall cartridge design and operation.Type: GrantFiled: September 10, 2012Date of Patent: May 10, 2016Assignee: ADVANTEST CORPORATIONInventors: John W. Andberg, Ira H. Leventhal, Matthew W. Losey, Yohannes Desta, Lakshmikanth Namburi, Vincent E. Lopopolo, Sanjeev Grover, Erik Volkerink
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Patent number: 9250290Abstract: A method for testing a semiconductor device. The method comprises moving a probe in a vertical direction towards an electrical structure on a semiconductor device to position the probe alongside the electrical structure. A tip of the probe is positioned lower than an elevation of an outermost periphery of the electrical structure. The method also includes moving the probe in a lateral direction towards the electrical structure to contact the electrical structure. The probe tip mechanically and electrically engages the electrical structure.Type: GrantFiled: March 25, 2013Date of Patent: February 2, 2016Assignee: ADVANTEST CORPORATIONInventors: Lakshmikanth Namburi, Florent Cros, Yohannes Desta
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Patent number: 8901950Abstract: Microelectronic contactors on a probe contactor substrate, or adhesive elements on a probe contactor or space transformer substrate, are protected by a sacrificial material as 1) the microelectronic contactors or adhesive elements are planarized, or 2) a surface of the substrate on which the microelectronic contactors or adhesive elements are formed is planarized. The adhesive elements are used to bond the probe contactor substrate to the space transformer substrate.Type: GrantFiled: February 19, 2010Date of Patent: December 2, 2014Assignee: Advantest America, IncInventors: Yohannes Desta, Lakshmikanth Namburi, Matthew Losey
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Publication number: 20140070828Abstract: Disclosed herein is a cost effective, efficient, massively parallel multi-wafer test cell. Additionally, this test cell can be used for both single-touchdown and multiple-touchdown applications. The invention uses a novel “split-cartridge” design, combined with a method for aligning wafers when they are separated from the probe card assembly, to create a cost effective, efficient multi-wafer test cell. A “probe-card stops” design may be used within the cartridge to simplify the overall cartridge design and operation.Type: ApplicationFiled: September 10, 2012Publication date: March 13, 2014Inventors: John W. Andberg, Ira H. Leventhal, Matthew W. Losey, Yohannes Desta, Lakshmikanth Namburi, Vincent E. Lopopolo, Sanjeev Grover, Erik Volkerink
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Publication number: 20130285688Abstract: A method for testing a semiconductor device. The method comprises moving a probe in a vertical direction towards an electrical structure on a semiconductor device to position the probe alongside the electrical structure. A tip of the probe is positioned lower than an elevation of an outermost periphery of the electrical structure. The method also includes moving the probe in a lateral direction towards the electrical structure to contact the electrical structure. The probe tip mechanically and electrically engages the electrical structure.Type: ApplicationFiled: March 25, 2013Publication date: October 31, 2013Inventors: Lakshmikanth NAMBURI, Florent CROS, Yohannes DESTA
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Publication number: 20130234746Abstract: Shielded probe array. In accordance with a first embodiment, an article of manufacture includes a plurality of rows of electronic probes. Each row of probes is substantially in a plane. Each probe includes a metal signal layer and a ground layer, separated by an insulator. The article of manufacture also includes a space transformer for mechanically supporting the plurality of rows of electronic probes. The space transformer also provides an electrical path from each of the probe metal signal layers and the probe ground layers to a higher level electronic assembly. Each of the plurality of rows of electronic probes may include a handle including a substrate for handling the row of electronic probes.Type: ApplicationFiled: March 7, 2013Publication date: September 12, 2013Applicant: ADVANTEST CORPORATIONInventor: Lakshmikanth NAMBURI
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Publication number: 20130234748Abstract: Transferring electronic probe assemblies to space transformers. In accordance with a first method embodiment, a plurality of probes is formed in a sacrificial material on a sacrificial substrate via microelectromechanical systems (MEMS) processes. The tips of the plurality of probes are formed adjacent to the sacrificial substrate and the remaining structure of the plurality of probes extends outward from the sacrificial substrate. The sacrificial material comprising the plurality of probes is attached to a space transformer. The space transformer includes a plurality of contacts on one surface for contacting the plurality of probes at a probe pitch and a corresponding second plurality of contacts on another surface at a second pitch, larger than the probe pitch, wherein each of the second plurality of contacts is electrically coupled to a corresponding one of the plurality of probes. The sacrificial substrate is removed, and the sacrificial material is removed, leaving the plurality of probes intact.Type: ApplicationFiled: March 7, 2013Publication date: September 12, 2013Applicant: ADVANTEST CORPORATIONInventors: Lakshmikanth NAMBURI, Florent CROS
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Publication number: 20130234747Abstract: Fine pitch probe array from bulk material. In accordance with a first method embodiment, an article of manufacture includes an array of probes. Each probe includes a probe tip, suitable for contacting an integrated circuit test point. Each probe tip is mounted on a probe finger structure. All of the probe finger structures of the array have the same material grain structure. The probe fingers may have a non-linear profile and/or be configured to act as a spring.Type: ApplicationFiled: March 7, 2013Publication date: September 12, 2013Applicant: ADVANTEST CORPORATIONInventor: Lakshmikanth Namburi
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Patent number: 8305101Abstract: A plurality of inserts are anchored in holes or recesses in a probe head. Shafts are coupled to the inserts, and adjustable multi-part fasteners are attached to the shafts and to a stiffener. The multi-part fasteners are operated to move the shafts and couple the probe head, the stiffener, and other components of a microelectronic contactor assembly. In some embodiments, the inserts may be anchored in the probe head using an adhesive. In some embodiments, the probe head may comprise more than one major substrate, and the inserts may be anchored in either of the substrates.Type: GrantFiled: February 19, 2010Date of Patent: November 6, 2012Assignee: Advantest America, IncInventors: Yohannes Desta, Chang Huang, Lakshmikanth Namburi, Matthew Losey
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Patent number: 8232818Abstract: A probe head for a microelectronic contactor assembly includes a space transformer substrate and a probe contactor substrate. Surface mount technology (SMT) electronic components are positioned close to conductive elements on the probe contactor substrate by placing the SMT electronic components in cavities in the probe contactor substrate, which cavities may be through-hole or non-through-hole cavities. In some cases, the SMT electronic components may be placed on pedestal substrates. SMT electronic components may also be positioned between the probe contactor and space transformer substrates.Type: GrantFiled: February 19, 2010Date of Patent: July 31, 2012Assignee: Advantest America, Inc.Inventors: Yohannes Desta, Lakshmikanth Namburi, Matthew Losey
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Publication number: 20100308854Abstract: The present invention is directed to a probe head having a probe contactor substrate with at least one slot that passes through the probe contactor substrate, at least one probe contactor adapted to test a device under test, with the probe contactor being coupled to the a top side of the probe contactor substrate and electrically connected to a terminal also disposed on top of the probe contactor substrate, and a space transformer having at least one bond pad coupled to a top side of the space transformer, and a bond interconnect which electrically couples the bond pad to the terminal through the slot in the probe contactor substrate.Type: ApplicationFiled: April 5, 2010Publication date: December 9, 2010Applicant: TOUCHDOWN TECHNOLOGIES, INC.Inventors: Raffi Garabedian, Salleh Ismail, Lakshmikanth Namburi
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Publication number: 20100237887Abstract: A plurality of inserts are anchored in holes or recesses in a probe head. Shafts are coupled to the inserts, and adjustable multi-part fasteners are attached to the shafts and to a stiffener. The multi-part fasteners are operated to move the shafts and couple the probe head, the stiffener, and other components of a microelectronic contactor assembly. In some embodiments, the inserts may be anchored in the probe head using an adhesive. In some embodiments, the probe head may comprise more than one major substrate, and the inserts may be anchored in either of the substrates.Type: ApplicationFiled: February 19, 2010Publication date: September 23, 2010Applicant: TOUCHDOWN TECHNOLOGIES, INC.Inventors: Yohannes Desta, Chang Huang, Lakshmikanth Namburi, Matthew Losey
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Publication number: 20100237888Abstract: Microelectronic contactors on a probe contactor substrate, or adhesive elements on a probe contactor or space transformer substrate, are protected by a sacrificial material as 1) the microelectronic contactors or adhesive elements are planarized, or 2) a surface of the substrate on which the microelectronic contactors or adhesive elements are formed is planarized. The adhesive elements are used to bond the probe contactor substrate to the space transformer substrate.Type: ApplicationFiled: February 19, 2010Publication date: September 23, 2010Applicant: TOUCHDOWN TECHNOLOGIES, INC.Inventors: Yohannes Desta, Lakshmikanth Namburi, Matthew Losey
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Publication number: 20100237889Abstract: A probe head for a microelectronic contactor assembly includes a space transformer substrate and a probe contactor substrate. Surface mount technology (SMT) electronic components are positioned close to conductive elements on the probe contactor substrate by placing the SMT electronic components in cavities in the probe contactor substrate, which cavities may be through-hole or non-through-hole cavities. In some cases, the SMT electronic components may be placed on pedestal substrates. SMT electronic components may also be positioned between the probe contactor and space transformer substrates.Type: ApplicationFiled: February 19, 2010Publication date: September 23, 2010Applicant: TOUCHDOWN TECHNOLOGIES, INC.Inventors: Yohannes Desta, Lakshmikanth Namburi, Matthew Losey
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Patent number: 7761966Abstract: A method for repairing a damaged probe from a probe card comprising the steps of removing the damaged probe from the probe card, separating one a plurality of replacement probes from a substrate and installing the one probe separated from the plurality of replacement probes where the damaged probe was removed.Type: GrantFiled: July 16, 2007Date of Patent: July 27, 2010Assignee: Touchdown Technologies, Inc.Inventors: Lakshmikanth Namburi, Raffi Garabedian
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Patent number: 7692436Abstract: The present invention is directed to a probe head having a probe contactor substrate with at least one slot that passes through the probe contactor substrate, at least one probe contactor adapted to test a device under test, with the probe contactor being coupled to the a top side of the probe contactor substrate and electrically connected to a terminal also disposed on top of the probe contactor substrate, and a space transformer having at least one bond pad coupled to a top side of the space transformer, and a bond interconnect which electrically couples the bond pad to the terminal through the slot in the probe contactor substrate.Type: GrantFiled: March 20, 2008Date of Patent: April 6, 2010Assignee: Touchdown Technologies, Inc.Inventors: Raffi Garabedian, Salleh Ismail, Lakshmikanth Namburi
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Publication number: 20090237099Abstract: The present invention is directed to a probe head having a probe contactor substrate with at least one slot that passes through the probe contactor substrate, at least one probe contactor adapted to test a device under test, with the probe contactor being coupled to the a top side of the probe contactor substrate and electrically connected to a terminal also disposed on top of the probe contactor substrate, and a space transformer having at least one bond pad coupled to a top side of the space transformer, and a bond interconnect which electrically couples the bond pad to the terminal through the slot in the probe contactor substrate.Type: ApplicationFiled: March 20, 2008Publication date: September 24, 2009Applicant: TOUCHDOWN TECHNOLOGIES, INC.Inventors: Raffi Garabedian, Salleh Ismail, Lakshmikanth Namburi
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Publication number: 20090072851Abstract: A novel probe design is presented that comprises a plurality of pivots. These pivots allow the probe to store the displacement energy more efficiently. The novel probe comprises a substrate, and a probe connected to the substrate. The probe further comprises a base that is connected to the substrate, a bending element connected to the base and a probe tip connected to the bending element. In one embodiment, the plurality of pivots may be connected to the substrate such that a portion of the probe may contact the plurality of pivots while the probe tip contacts the device. In another embodiment, the plurality of pivots is connected to the bending element, such that the plurality of pivots may contact the substrate while the probe tip contacts the device. The bending element may also comprise a forked bending element connected to the base, such as the forked bending structure described in co-pending and related patent application Ser. No. 11/855,094.Type: ApplicationFiled: September 10, 2008Publication date: March 19, 2009Applicant: TOUCHDOWN TECHNOLOGIES, INC.Inventors: Lakshmikanth Namburi, Salleh Ismail