Patents by Inventor Rajiv V. Joshi
Rajiv V. Joshi 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: 9135987Abstract: A memory circuit includes a voltage boosting circuit for generating a voltage that exceeds a voltage supply of the voltage boosting circuit. The voltage boosting circuit includes a first transistor having a first polarity type and a second transistor having a second polarity type opposite the first transistor. The first transistor is a planar transistor, a source of the first transistor being connected with the voltage supply, and a gate of the first transistor receiving a control signal. The second transistor includes a gate formed in at least two planes. A source of the second transistor is connected with the voltage supply, a gate of the second transistor receives the control signal, and a drain of the second transistor is connected with a drain of the first transistor and forms an output of the voltage boosting circuit for generating a boosted supply voltage as a function of the control signal.Type: GrantFiled: July 1, 2013Date of Patent: September 15, 2015Assignee: Internatinal Business Machines CorporationInventors: Rajiv V. Joshi, Keunwoo Kim
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Publication number: 20150247890Abstract: A method for calculating leakage of a circuit including a plurality of transistors includes simulating a three-dimensional model of the circuit, wherein the simulating accounts for a subset of the plurality of the transistors that includes less than all of the plurality of transistors, and calculating the leakage in accordance with the three-dimensional model.Type: ApplicationFiled: February 28, 2014Publication date: September 3, 2015Applicant: International Business Machines CorporationInventors: RAJIV V. JOSHI, Keunwoo Kim
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Publication number: 20150227669Abstract: A method for predicting a condition in a circuit under design includes obtaining a set comprising first static noise margin curve for the circuit and a second static noise margin curve for the circuit, wherein the second static noise margin curve is complementary to the first static noise margin curve, matching the set to a two-dimensional model of a cell, and predicting the condition in accordance with hardware characterization data corresponding to the cell.Type: ApplicationFiled: February 10, 2014Publication date: August 13, 2015Applicant: International Business Machines CorporationInventors: Rajiv V. Joshi, Keunwoo Kim
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Patent number: 9036430Abstract: A memory circuit includes a voltage boosting circuit for generating a voltage that exceeds a voltage supply of the voltage boosting circuit. The voltage boosting circuit includes a first transistor having a first polarity type and a second transistor having a second polarity type opposite the first transistor. The first transistor is a planar transistor, a source of the first transistor being connected with the voltage supply, and a gate of the first transistor receiving a control signal. The second transistor includes a gate formed in at least two planes. A source of the second transistor is connected with the voltage supply, a gate of the second transistor receives the control signal, and a drain of the second transistor is connected with a drain of the first transistor and forms an output of the voltage boosting circuit for generating a boosted supply voltage as a function of the control signal.Type: GrantFiled: July 26, 2013Date of Patent: May 19, 2015Assignee: International Business Machines CorporationInventors: Rajiv V. Joshi, Keunwoo Kim
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Publication number: 20150099356Abstract: Semiconductor structures are provided containing an electronic fuse (E-fuse) that includes a fuse element and at least one underlying tungsten contact that is used for programming the fuse element. In some embodiments, a pair of neighboring tungsten contacts is used for programming the fuse element. In another embodiment, an overlying conductive region can be used in conjunction with one of the underlying tungsten contacts to program the fuse element. In the disclosed structures, the fuse element is in direct contact with upper surfaces of a pair of underlying tungsten contacts. In one embodiment, the semiconductor structures may include an interconnect level located atop the fuse element. The interconnect level has a plurality of conductive regions embedded therein. In other embodiments, the fuse element is located within an interconnect level that is located atop the tungsten contacts.Type: ApplicationFiled: December 17, 2014Publication date: April 9, 2015Inventors: Rajiv V. Joshi, Chih-Chao Yang
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Patent number: 8941110Abstract: Semiconductor structures are provided containing an electronic fuse (E-fuse) that includes a fuse element and at least one underlying tungsten contact that is used for programming the fuse element. In some embodiments, a pair of neighboring tungsten contacts is used for programming the fuse element. In another embodiment, an overlying conductive region can be used in conjunction with one of the underlying tungsten contacts to program the fuse element. In the disclosed structures, the fuse element is in direct contact with upper surfaces of a pair of underlying tungsten contacts. In one embodiment, the semiconductor structures may include an interconnect level located atop the fuse element. The interconnect level has a plurality of conductive regions embedded therein. In other embodiments, the fuse element is located within an interconnect level that is located atop the tungsten contacts.Type: GrantFiled: November 17, 2011Date of Patent: January 27, 2015Assignee: International Business Machines CorporationInventors: Rajiv V. Joshi, Chih-Chao Yang
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Publication number: 20150003173Abstract: A memory circuit includes a voltage boosting circuit for generating a voltage that exceeds a voltage supply of the voltage boosting circuit. The voltage boosting circuit includes a first transistor having a first polarity type and a second transistor having a second polarity type opposite the first transistor. The first transistor is a planar transistor, a source of the first transistor being connected with the voltage supply, and a gate of the first transistor receiving a control signal. The second transistor includes a gate formed in at least two planes. A source of the second transistor is connected with the voltage supply, a gate of the second transistor receives the control signal, and a drain of the second transistor is connected with a drain of the first transistor and forms an output of the voltage boosting circuit for generating a boosted supply voltage as a function of the control signal.Type: ApplicationFiled: July 1, 2013Publication date: January 1, 2015Inventors: Rajiv V. Joshi, Keunwoo Kim
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Publication number: 20150003174Abstract: A memory circuit includes a voltage boosting circuit for generating a voltage that exceeds a voltage supply of the voltage boosting circuit. The voltage boosting circuit includes a first transistor having a first polarity type and a second transistor having a second polarity type opposite the first transistor. The first transistor is a planar transistor, a source of the first transistor being connected with the voltage supply, and a gate of the first transistor receiving a control signal. The second transistor includes a gate formed in at least two planes. A source of the second transistor is connected with the voltage supply, a gate of the second transistor receives the control signal, and a drain of the second transistor is connected with a drain of the first transistor and forms an output of the voltage boosting circuit for generating a boosted supply voltage as a function of the control signal.Type: ApplicationFiled: July 26, 2013Publication date: January 1, 2015Applicant: International Business Machines CorporationInventors: Rajiv V. Joshi, Keunwoo Kim
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Patent number: 8849643Abstract: In one embodiment, the invention is a method and apparatus for table-lookup-based models for yield analysis acceleration. One embodiment of a method for statistically evaluating a design of an integrated circuit includes simulating the integrated circuit and generating a lookup table for use in the simulating, the lookup table comprising one or more blocks that specify a device element for an associated bias voltage, wherein the generating comprises generating only those of the one or more blocks that specify the device element for a bias voltage that is required during the simulating.Type: GrantFiled: May 13, 2011Date of Patent: September 30, 2014Assignee: International Business Machines CorporationInventors: Rajiv V. Joshi, Rouwaida N. Kanj, Keunwoo Kim, Tong Li
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Publication number: 20140278309Abstract: The present disclosure relates generally to the field of selective importance sampling. In various examples, selective importance sampling may be implemented in the form of systems and/or algorithms.Type: ApplicationFiled: March 15, 2013Publication date: September 18, 2014Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Rajiv V. Joshi, Rouwaida N. Kanj, Pranita Kerber
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Publication number: 20140278296Abstract: The present disclosure relates generally to the field of selective importance sampling. In various examples, selective importance sampling may be implemented in the form of methods and/or algorithms.Type: ApplicationFiled: September 11, 2013Publication date: September 18, 2014Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Rajiv V. Joshi, Rouwaida N. Kanj, Pranita Kerber
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Patent number: 8799732Abstract: Correlated failure distribution for memory arrays having different groupings of memory cells is estimated by constructing memory unit models for the groupings based on multiple parameters, establishing failure conditions of the memory unit model using fast statistical analysis, calculating a fail boundary of the parameters for each memory unit model based on its corresponding failure conditions, and constructing memory array models characterized by the fail boundaries. Operation of a memory array model is repeatedly simulated with random values of the parameters assigned to the memory cells and peripheral logic elements to identify memory unit failures for each simulated operation. A mean and a variance is calculated for each memory array model, and an optimal architecture can thereafter be identified by selecting the grouping exhibiting the best mean and variance, subject to any other circuit requirements such as power or area.Type: GrantFiled: February 9, 2012Date of Patent: August 5, 2014Assignee: International Business Machines CorporationInventors: Rajiv V. Joshi, Rouwaida N. Kanj, Sani R. Nassif
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Publication number: 20140215274Abstract: A mechanism is provided for reusing importance sampling for efficient cell failure rate estimation of process variations and other design considerations. First, the mechanism performs a search across circuit parameters to determine failures with respect to a set of performance variables. For a single failure region, the initial search may be a uniform sampling of the parameter space. Mixture importance sampling (MIS) efficiently may estimate the single failure region. The mechanism then finds a center of gravity for each metric and finds importance samples. Then, for each new origin corresponding to a process variation or other design consideration, the mechanism finds a suitable projection and recomputes new importance sampling (IS) ratios.Type: ApplicationFiled: April 1, 2014Publication date: July 31, 2014Applicant: International Business Machines CorporationInventors: Rajiv V. Joshi, Rouwaida N. Kanj, Sani R. Nassif, Carl J. Radens
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Patent number: 8767501Abstract: Associative index extended (AIX) caches can be functionally implemented through a reconfigurable decoder that employs programmable line decoding. The reconfigurable decoder features scalability in the number of lines, the number of index extension bits, and the number of banks. The reconfigurable decoder can switch between pure direct mapped (DM) mode and direct mapped-associative index extended (DM-AIX) mode of operation. For banked configurations, the reconfigurable decoder provides the ability to run some banks in DM mode and some other banks in DM-AIX mode. A cache employing this reconfigurable decoder can provide a comparable level of latency as a DM cache with minimal modifications to a DM cache circuitry of an additional logic circuit on a critical signal path, while providing low power operation at low area overhead with SA cache-like miss rates. Address masking and most-recently-used-save replacement policy can be employed with a single bit overhead per line.Type: GrantFiled: July 17, 2012Date of Patent: July 1, 2014Assignee: International Business Machines CorporationInventors: Rajiv V. Joshi, Ajay N. Bhoj
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Patent number: 8756643Abstract: A system and method for controlling an interactive media system includes generating, by a first communication system, an information signal and a display signal for display by an electronic medium, transferring the information signal by a wireless signal transfer network, receiving and processing the information signal by a server, providing, by the server, data included in the information signal to a functional network, wherein the server retrieves return data from the functional network and provides the return data to a second communication system, generating, by the second communication system, a return information signal and providing the return information signal to the wireless signal transfer network, and transferring, by the wireless signal transfer network, the return information signal to the first communication system, which generates the display signal for display on the electronic medium.Type: GrantFiled: April 30, 2012Date of Patent: June 17, 2014Assignee: International Business Machines CorporationInventors: Rajiv V. Joshi, Suchitra R. Joshi
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Patent number: 8687445Abstract: A method for repairing degraded field effect transistors includes forward biasing PN junctions of one of a source and a drain of a field effect transistor (FET), and a body of the FET. Charge is injected from a substrate to a gate region to neutralize charge in the gate region. The method is applicable to CMOS devices. Repair circuits are disclosed for implementing the repairs.Type: GrantFiled: March 18, 2013Date of Patent: April 1, 2014Assignee: International Business Machines CorporationInventors: Louis L. C. Hsu, Rajiv V. Joshi, Zhijian J. Yang, Ping-Chuan Wang
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Patent number: 8670281Abstract: An apparatus and method for combating the effects of bias temperature instability (BTI) and other variability in a memory cell. Bit lines connecting to a memory cell contain two alternate paths that criss-cross to connect a lower portion of a first bit line to an upper portion of a second bit line, and to connect a lower portion of the second bit line to an upper portion of the first bit line. Alternative to activating transistors on the bit lines to read and write to the memory cell, transistors on the alternative paths may be activated to read and write to the memory cell from the opposite bit line. In this fashion, the memory cell may be read through the bit lines to a sense amplifier where the bit values are latched. While the bit values remain latched in the sense amplifier, the transistors on the bit lines are deactivated and the transistors on the alternate paths are activated.Type: GrantFiled: June 12, 2013Date of Patent: March 11, 2014Assignee: International Business Machines CorporationInventors: Rajiv V. Joshi, Rouwaida N. Kanj, Jente B. Kuang, Carl J. Radens
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Publication number: 20140025881Abstract: Associative index extended (AIX) caches can be functionally implemented through a reconfigurable decoder that employs programmable line decoding. The reconfigurable decoder features scalability in the number of lines, the number of index extension bits, and the number of banks. The reconfigurable decoder can switch between pure direct mapped (DM) mode and direct mapped-associative index extended (DM-AIX) mode of operation. For banked configurations, the reconfigurable decoder provides the ability to run some banks in DM mode and some other banks in DM-AIX mode. A cache employing this reconfigurable decoder can provide a comparable level of latency as a DM cache with minimal modifications to a DM cache circuitry of an additional logic circuit on a critical signal path, while providing low power operation at low area overhead with SA cache-like miss rates. Address masking and most-recently-used-save replacement policy can be employed with a single bit overhead per line.Type: ApplicationFiled: July 17, 2012Publication date: January 23, 2014Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Rajiv V. Joshi, Ajay N. Bhoj
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Patent number: 8606557Abstract: Techniques for electronic circuit design simulation are provided. In one aspect, a method for electronic circuit design simulation includes the following steps. A model (e.g., a physics-based model) of the circuit design is created. Error tables are created containing data related to one or more regions of the circuit design. The model is modified with data from the error tables. The modified model is used to simulate the circuit design.Type: GrantFiled: February 2, 2010Date of Patent: December 10, 2013Assignee: International Business Machines CorporationInventors: Rajiv V. Joshi, Rouwaida N. Kanj, Keunwoo Kim
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Patent number: 8588009Abstract: An apparatus and method for combating the effects of bias temperature instability (BTI) in a memory cell. Bit lines connecting to a memory cell contain two alternate paths criss-crossing to connect a lower portion of a first bit line to an upper portion of a second bit line, and to connect a lower portion of the second bit line to an upper portion of the first bit line. Alternative to activating transistors on the bit lines to read and write to the memory cell, transistors on the alternative paths may be activated to read and write to the memory cell from the opposite bit lines. The memory cell may be read through the bit lines to a sense amplifier, the transistors on the bit lines are subsequently deactivated and the transistors on the alternate paths are activated to write transposed bit values to the memory cell, thereby reversing the biases.Type: GrantFiled: September 28, 2011Date of Patent: November 19, 2013Assignee: International Business Machines CorporationInventors: Rajiv V. Joshi, Rouwaida N. Kanj, Jente B. Kuang, Carl J. Radens