Patents by Inventor Rajanatha Shettigara
Rajanatha Shettigara 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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Publication number: 20230204780Abstract: A light detection and ranging (LIDAR) system may include a transceiver disposed on a first substrate and comprising a plurality of receiver detectors; and a shared clock source disposed remotely from the transceiver on a second substrate and comprising a shared clock that is structured and arranged to control and synchronize operation of the plurality of receiver detectors to determine time-of-flight or reflectance.Type: ApplicationFiled: December 22, 2021Publication date: June 29, 2023Inventor: Rajanatha Shettigara
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Publication number: 20230168348Abstract: Methods and systems for combining return signals from multiple channels of a LIDAR measurement system are described herein. In one aspect, the outputs of multiple receive channels are electrically coupled before input to a single channel of an analog to digital converter. In another aspect, a DC offset voltage is provided at the output of each transimpedance amplifier of each receive channel to improve measured signal quality. In another aspect, a bias voltage supplied to each photodetector of each receive channel is adjusted based on measured temperature to save power and improve measurement consistency. In another aspect, a bias voltage supplied to each illumination source of each transmit channel is adjusted based on measured temperature. In another aspect, a multiplexer is employed to multiplex multiple sets of output signals of corresponding sets of receive channels before analog to digital conversion.Type: ApplicationFiled: September 2, 2022Publication date: June 1, 2023Inventors: David S. Hall, Rajanatha Shettigara, Nathan Slattengren, Aaron Chen, Anand Gopalan
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Patent number: 11435446Abstract: Methods and systems for combining return signals from multiple channels of a LIDAR measurement system are described herein. In one aspect, the outputs of multiple receive channels are electrically coupled before input to a single channel of an analog to digital converter. In another aspect, a DC offset voltage is provided at the output of each transimpedance amplifier of each receive channel to improve measured signal quality. In another aspect, a bias voltage supplied to each photodetector of each receive channel is adjusted based on measured temperature to save power and improve measurement consistency. In another aspect, a bias voltage supplied to each illumination source of each transmit channel is adjusted based on measured temperature. In another aspect, a multiplexer is employed to multiplex multiple sets of output signals of corresponding sets of receive channels before analog to digital conversion.Type: GrantFiled: August 6, 2020Date of Patent: September 6, 2022Assignee: VELODYNE LIDAR USA, INC.Inventors: David S. Hall, Rajanatha Shettigara, Nathan Slattengren, Aaron Chen, Anand Gopalan
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Publication number: 20200379094Abstract: Methods and systems for combining return signals from multiple channels of a LIDAR measurement system are described herein. In one aspect, the outputs of multiple receive channels are electrically coupled before input to a single channel of an analog to digital converter. In another aspect, a DC offset voltage is provided at the output of each transimpedance amplifier of each receive channel to improve measured signal quality. In another aspect, a bias voltage supplied to each photodetector of each receive channel is adjusted based on measured temperature to save power and improve measurement consistency. In another aspect, a bias voltage supplied to each illumination source of each transmit channel is adjusted based on measured temperature. In another aspect, a multiplexer is employed to multiplex multiple sets of output signals of corresponding sets of receive channels before analog to digital conversion.Type: ApplicationFiled: August 6, 2020Publication date: December 3, 2020Inventors: David S. Hall, Rajanatha Shettigara, Nathan Slattengren, Aaron Chen, Anand Gopalan
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Patent number: 10739444Abstract: Methods and systems for combining return signals from multiple channels of a LIDAR measurement system are described herein. In one aspect, the outputs of multiple receive channels are electrically coupled before input to a single channel of an analog to digital converter. In another aspect, a DC offset voltage is provided at the output of each transimpedance amplifier of each receive channel to improve measured signal quality. In another aspect, a bias voltage supplied to each photodetector of each receive channel is adjusted based on measured temperature to save power and improve measurement consistency. In another aspect, a bias voltage supplied to each illumination source of each transmit channel is adjusted based on measured temperature. In another aspect, a multiplexer is employed to multiplex multiple sets of output signals of corresponding sets of receive channels before analog to digital conversion.Type: GrantFiled: September 18, 2018Date of Patent: August 11, 2020Assignee: VELODYNE LIDAR, INC.Inventors: David S. Hall, Rajanatha Shettigara, Nathan Slattengren, Aaron Chen, Anand Gopalan
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Patent number: 10461918Abstract: A data transmission method includes, detecting an incoming link training sequence that is transmitted from an upstream transmitter, generating a marker indicating a timing location of a word included in the incoming link training sequence, generating a self link training sequence based on a local reference clock, adjusting a time difference in the incoming link training sequence and the self link training sequence, and retransmitting an incoming bit stream based on the self link training sequence being matched to the incoming link training sequence.Type: GrantFiled: August 31, 2018Date of Patent: October 29, 2019Assignee: MEGACHIPS TECHNOLOGY AMERICA CORPORATIONInventors: Alan Kobayashi, Rajanatha Shettigara, Ramakrishna Chilukuri, Rahul Kumar Agarwal, Nobuhiro Yanagisawa, Sujan Valiyaka Thomas, Ryuichi Moriizumi, Satoru Kumashiro
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Publication number: 20190178992Abstract: Methods and systems for combining return signals from multiple channels of a LIDAR measurement system are described herein. In one aspect, the outputs of multiple receive channels are electrically coupled before input to a single channel of an analog to digital converter. In another aspect, a DC offset voltage is provided at the output of each transimpedance amplifier of each receive channel to improve measured signal quality. In another aspect, a bias voltage supplied to each photodetector of each receive channel is adjusted based on measured temperature to save power and improve measurement consistency. In another aspect, a bias voltage supplied to each illumination source of each transmit channel is adjusted based on measured temperature. In another aspect, a multiplexer is employed to multiplex multiple sets of output signals of corresponding sets of receive channels before analog to digital conversion.Type: ApplicationFiled: September 18, 2018Publication date: June 13, 2019Inventors: David S. Hall, Rajanatha Shettigara, Nathan Slattengren, Aaron Chen, Anand Gopalan
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Publication number: 20190028262Abstract: A data transmission method includes, detecting an incoming link training sequence that is transmitted from an upstream transmitter, generating a marker indicating a timing location of a word included in the incoming link training sequence, generating a self link training sequence based on a local reference clock, adjusting a time difference in the incoming link training sequence and the self link training sequence, and retransmitting an incoming bit stream based on the self link training sequence being matched to the incoming link training sequence.Type: ApplicationFiled: August 31, 2018Publication date: January 24, 2019Applicant: MEGACHIPS TECHNOLOGY AMERICA CORPORATIONInventors: Alan KOBAYASHI, Rajanatha SHETTIGARA, Ramakrishna CHILUKURI, Rahul Kumar AGARWAL, Nobuhiro YANAGISAWA, Sujan Valiyaka THOMAS, Ryuichi MORIIZUMI, Satoru KUMASHIRO
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Patent number: 7398443Abstract: System and method for automatic fault-testing of a logic block and the interfaces of macros with logic gates inside a chip, using an at-speed logic-BIST internal to the chip. Following an initialization of internal storage elements, a set of test signals are generated and processed by the logic block. The output of the logic block is accumulated into a signature and compared to a reference signature to detect faults. Testing can be performed on an ATE (Automatic Test Equipment) using a simple test vector, or can be performed by a field engineer on the actual board comprising the chip.Type: GrantFiled: May 31, 2005Date of Patent: July 8, 2008Assignee: Genesis Microchip Inc.Inventors: Venkat Chary Mushirabad, Rajanatha Shettigara
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Patent number: 7222037Abstract: A method of automatic gain control in both analog and digital domain is performed by receiving an incoming analog signal, determining an overall gain factor, determining a coarse analog gain control value and a fine digital gain control value, each of which, when taken together substantially equals the already determined overall gain factor, modifying the incoming analog signal using the coarse analog gain control value to form a coarsely adjusted digital signal, digitizing the coarsely adjusted digital signal, and using the fine digital gain control value to process the coarsely adjusted digital signal to form an outgoing digital signal, wherein the outgoing digital signal has been modified in both the analog domain and subsequently in the digital domain to achieve an appropriate signal to noise ratio.Type: GrantFiled: August 10, 2005Date of Patent: May 22, 2007Assignee: Genesis Microchip Inc.Inventors: Venkat Chary Mushirahad, Sujan Thomas, Rajanatha Shettigara
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Publication number: 20060107151Abstract: System and method for automatic fault-testing of a logic block and the interfaces of macros with logic gates inside a chip, using an at-speed logic-BIST internal to the chip. Following an initialization of internal storage elements, a set of test signals are generated and processed by the logic block. The output of the logic block is accumulated into a signature and compared to a reference signature to detect faults. Testing can be performed on an ATE (Automatic Test Equipment) using a simple test vector, or can be performed by a field engineer on the actual board comprising the chip.Type: ApplicationFiled: May 31, 2005Publication date: May 18, 2006Inventors: Venkat Mushirabad, Rajanatha Shettigara
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Publication number: 20060089813Abstract: A method of automatic gain control in both analog and digital domain is performed by receiving an incoming analog signal, determining an overall gain factor, determining a coarse analog gain control value and a fine digital gain control value, each of which, when taken together substantially equals the already determined overall gain factor, modifying the incoming analog signal using the coarse analog gain control value to form a coarsely adjusted digital signal, digitizing the coarsely adjusted digital signal, and using the fine digital gain control value to process the coarsely adjusted digital signal to form an outgoing digital signal, wherein the outgoing digital signal has been modified in both the analog domain and subsequently in the digital domain to achieve an appropriate signal to noise ratio.Type: ApplicationFiled: August 10, 2005Publication date: April 27, 2006Applicant: Genesis Microchip Inc.Inventors: Venkat Mushirahad, Sujan Thomas, Rajanatha Shettigara