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公开(公告)号：US12204970B1
公开(公告)日：2025-01-21
申请号：US17970794
申请日：2022-10-21
Applicant: Impinj, Inc.
Inventor： Charles J. T. Peach , John D. Hyde , Jay A. Kuhn , Theron Stanford , Amita Patil
IPC: G06K19/07 , H03K17/687
Abstract: Embodiments are directed to rectifiers using a single bias current or bias current path to bias multiple rectifying elements. A rectifier that has multiple rectifier stages coupled together serially includes a bias current path coupled to each of the rectifier stages. Thee bias current path is configured to simultaneously bias rectifying elements in each of the rectifier stages by using a bias current to bias a first rectifying element and reusing the bias current to bias other rectifying elements.
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公开(公告)号：US11798392B1
公开(公告)日：2023-10-24
申请号：US17749292
申请日：2022-05-20
Applicant: Impinj, Inc.
Inventor： Christopher J. Diorio , Harley Heinrich , Matthew Robshaw , Theron Stanford , Charles J. T. Peach , John D. Hyde , Tan Mau Wu
CPC classification number: G08B21/182 , G06K7/10366 , G06K19/0723
Abstract: RFID ICs sense and indicate changes in their surrounding environment, such as changes in temperature, humidity, chemical presence, RF signals, and similar. An RFID IC indicates when a significant environmental change has occurred, for example by adjusting the value of a flag, writing data to memory, transmitting a message to an external entity, exiting a sleep state, and/or responding repeatedly to an inventorying reader. In some cases, RFID IC actively notifies an external entity that a significant environmental change has been sensed. For example, RFID IC may alert the external entity by participating in a special inventory process meant for RFID ICs sending environmental change. The RFID IC may alert the external entity by interjecting itself into an inventory round, re-participating in an inventory round, refraining from entering a sleep state after inventorying, and/or adjusting timing of a scheduled reply to communicate with an RFID reader ahead of schedule.
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公开(公告)号：US08600298B1
公开(公告)日：2013-12-03
申请号：US13666285
申请日：2012-11-01
Applicant: Impinj, Inc.
Inventor： John D. Hyde , Kurt E. Sundstrom
IPC: H04B5/00
CPC classification number: G06K7/10029 , G06K19/0707 , G06K19/0723
Abstract: RFID tags, tag circuits, and methods are provided that reject at least in part the distortion caused to wireless signals by interference in the environment. When the received RF wave is converted into an unfiltered input (971), a filtered output (972) is generated that does not include an artifact feature deriving from the distortion. The filtered output is used instead of the unfiltered input, which results in tag operation as if there were less interference in the environment, or none at all.
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公开(公告)号：US12125364B1
公开(公告)日：2024-10-22
申请号：US18490786
申请日：2023-10-20
Applicant: Impinj, Inc.
Inventor： Christopher J. Diorio , Harley Heinrich , Matthew Robshaw , Theron Stanford , Charles J. T. Peach , John D. Hyde , Tan Mau Wu
CPC classification number: G08B21/182 , G06K7/10366 , G06K19/0723
Abstract: RFID ICs sense and indicate changes in their surrounding environment, such as changes in temperature, humidity, chemical presence, RF signals, and similar. An RFID IC indicates when a significant environmental change has occurred, for example by adjusting the value of a flag, writing data to memory, transmitting a message to an external entity, exiting a sleep state, and/or responding repeatedly to an inventorying reader. In some cases, RFID IC actively notifies an external entity that a significant environmental change has been sensed. For example, RFID IC may alert the external entity by participating in a special inventory process meant for RFID ICs sending environmental change. The RFID IC may alert the external entity by interjecting itself into an inventory round, re-participating in an inventory round, refraining from entering a sleep state after inventorying, and/or adjusting timing of a scheduled reply to communicate with an RFID reader ahead of schedule.
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公开(公告)号：US11734540B1
公开(公告)日：2023-08-22
申请号：US17534576
申请日：2021-11-24
Applicant: Impinj, Inc.
Inventor： Amita Patil , Jay A. Kuhn , Charles J. T. Peach , John D. Hyde , Jaskarn Johal
CPC classification number: G06K19/0723 , G06K19/0715
Abstract: Backflow in rectifiers may be reduced via biasing. Upon determining that backflow within a rectifier is likely, one or more rectifying elements in the rectifier may be debiased, via analog or digital means. The debiased rectifying elements become less conductive or nonconductive, thereby reducing or preventing backflow. The determination of backflow likelihood may be performed based on a signal to be backscattered or the amplitude-modulated envelope of an incident RF wave, and may be digital or analog in nature.
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Patent Agency Ranking
公开(公告)号：US09886658B1
公开(公告)日：2018-02-06
申请号：US15191540
申请日：2016-06-24
Applicant: Impinj, Inc.
Inventor： Theron Stanford , Charles J. T. Peach , Jay A. Kuhn , Harley K. Heinrich , John D. Hyde , Christopher J. Diorio , Alberto Pesavento
IPC: G06K19/06 , G06K19/07 , G06K19/077
CPC classification number: G06K19/0723 , G06K19/07749
Abstract: Embodiments are directed to mitigating power-based impedance changes in Radio Frequency Identification (RFID) tags. The intrinsic impedance of components in an RFID tag front-end may change as incident RF power on the tag changes, causing the input impedance of the front-end to change and altering the RF properties of the RFID tag. A number of approaches can be used to mitigate input impedance variations due to power variations. One approach involves adjusting the operating point of one or more components in the RFID tag front-end to change their intrinsic impedances so as to counteract or mitigate the RF-power-based input impedance variation.
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公开(公告)号：US09646186B1
公开(公告)日：2017-05-09
申请号：US15042162
申请日：2016-02-12
Applicant: Impinj, Inc.
Inventor： John D. Hyde , Harley K. Heinrich , Charles Peach , Christopher J. Diorio , Theron Stanford
IPC: G06K7/10 , G06K19/07 , G06K19/077
CPC classification number: G06K7/10297 , G06K7/10198 , G06K19/0723 , G06K19/0726 , G06K19/07754 , G06K19/07773
Abstract: Impedance matching between an RFID IC and an antenna may be tuned to increase the amount of power that the IC can extract from an RF wave incident on the antenna. A tuning circuit tunes the impedance matching by adjusting a variable impedance coupling the IC and the antenna and/or adjusting a bias of a rectifier in the IC. The tuning circuit may adjust the variable impedance and/or the rectifier bias based on predetermined or stored tuning settings. For example, the tuning circuit may retrieve stored tuning settings from a nonvolatile memory (NVM) configured to operate with limited functionality at low power.
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公开(公告)号：US11853826B1
公开(公告)日：2023-12-26
申请号：US17868504
申请日：2022-07-19
Applicant: Impinj, Inc.
Inventor： John D. Hyde , Shailendra Srinivas , Jay Kuhn , Ronald A. Oliver , Harley Heinrich , Theron Stanford , Christopher J. Diorio
CPC classification number: G06K19/0712 , G06K7/016 , G06K7/10148 , G06K7/10198
Abstract: An RFID IC may operate at a relatively low clock frequency while impedance matching to an antenna is being tuned to increase the amount of power that the IC can extract from an incident RF wave. A tuning circuit tunes the impedance matching by adjusting a variable impedance coupling the IC and the antenna. The IC may power-up with a low clock frequency or reduce its current clock frequency to a lower clock frequency prior to tuning or during the tuning process, and may increase its clock frequency upon completion of tuning or during the tuning process.
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公开(公告)号：US11481591B1
公开(公告)日：2022-10-25
申请号：US16925576
申请日：2020-07-10
Applicant: Impinj, Inc.
Inventor： Charles J. T. Peach , John D. Hyde , Jay A. Kuhn , Theron Stanford , Amita Patil
IPC: G06K19/07 , H03K17/687
Abstract: Embodiments are directed to rectifiers using a single bias current or bias current path to bias multiple rectifying elements. A rectifier that has multiple rectifier stages coupled together serially includes a bias current path coupled to each of the rectifier stages. The bias current path is configured to simultaneously bias rectifying elements in each of the rectifier stages by using a bias current to bias a first rectifying element and reusing the bias current to bias other rectifying elements.
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公开(公告)号：US11188803B1
公开(公告)日：2021-11-30
申请号：US16810892
申请日：2020-03-06
Applicant: Impinj, Inc.
Inventor： Amita Patil , Jay A. Kuhn , Charles J. T. Peach , John D. Hyde , Jaskarn Johal
Abstract: Backflow in rectifiers may be reduced via biasing. Upon determining that backflow within a rectifier is likely, one or more rectifying elements in the rectifier may be debiased, via analog or digital means. The debiased rectifying elements become less conductive or nonconductive, thereby reducing or preventing backflow. The determination of backflow likelihood may be performed based on a signal to be backscattered or the amplitude-modulated envelope of an incident RF wave, and may be digital or analog in nature.
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