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公开(公告)号：US20230074376A1
公开(公告)日：2023-03-09
申请号：US17468586
申请日：2021-09-07
Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION , FUJIKURA LTD
Inventor： Alberto Valdes Garcia , Arun Paidimarri , Bodhisatwa Sadhu , Jean-Olivier Plouchart , Xiaoxiong Gu , Christian Wilhelmus Baks , Yo Yamaguchi , Kiyoshi Kobayashi , Yoshiharu Fujisaku , Ning Guan
Abstract: A phased array antenna includes an antenna array substrate having a plurality of antenna elements. At least two beamformers are coupled to the plurality of antenna elements. At least two filters support different frequency bands and are respectively coupled to the at least two beamformers. A frequency converter is coupled to the at least two filters, the frequency converter including one intermediate frequency (IF) port and at least two radio frequency (RF) ports. The one IF port of the frequency converter is configured to support the at least two beamformers via the at least two RF ports. A first beamformer of the at least two beamformers is coupled to a first filter of the at least two filters to form a first beam in a direction different than a second beamformer of the first two beamformers coupled to a second filter of the at least two filters.
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公开(公告)号：US11533023B2
公开(公告)日：2022-12-20
申请号：US17239527
申请日：2021-04-23
Applicant: International Business Machines Corporation
Inventor： Wooram Lee , Bodhisatwa Sadhu
Abstract: A TX/RX switch includes a power amplifier (PA), a Low Noise Amplifier (LNA), and an antenna connection. The PA is connected to a PA matching network that has a PA network impedance and a common PA-LNA impedance connected in one or more series-parallel combinations in different embodiments in a transmitting mode. The LNA is connected to a LNA matching network that has a LNA. network impedance and the same common PA-LNA impedance connected in one or more series-parallel combinations in a receive mode. A mode switch can connect the common PA-LNA impedance in different configurations to enable the transmitting and receiving mode respectively. In some embodiments, the mode switch can short or open circuit the connection of the PA matching circuit or the LNA matching circuit to the antenna. In some embodiments, the mode switch can also turn power on or off to the PA or the LNA when the switch is in a mode where the respective amplifier is not selected. Accordingly, with specific design limitations on the common PA-LNA impedance combined with different mode switch configurations of the TX/RX switch components in either the TX or RX mode, the TX/RX switch operates within a design bandwidth without, transmission lines embedded in the TX/RX switch circuitry and provides optimum power transfer from/to the antenna at the antenna connection with reduced noise.
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公开(公告)号：US11444702B2
公开(公告)日：2022-09-13
申请号：US16836122
申请日：2020-03-31
Applicant: International Business Machines Corporation
Inventor： Bodhisatwa Sadhu , Supriyo Chakraborty
Abstract: Systems and methods for identifying a device are described. In an example, a processor can receive a first signal having a first waveform encoding data. The processor can extract the data from the first signal. The processor can determine a transformation being used to encode the data in the first waveform. The processor can generate a second signal using the determined transformation to encode the data in a second waveform. The processor can determine a difference between the first waveform and the second waveform. The processor can identify a device as a candidate device that sent the first signal, based on the determined difference.
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公开(公告)号：US11303245B2
公开(公告)日：2022-04-12
申请号：US16870357
申请日：2020-05-08
Applicant: International Business Machines Corporation
Inventor： Bodhisatwa Sadhu
IPC: H03B5/12
Abstract: Methods and systems for reducing phase noise in a voltage controlled oscillator (VCO) are described. In an example, a first transistor, a second transistor, a third transistor, and a fourth transistor, can be provided. A transformer can be used to decouple drain terminals and gate terminals of the first, second, third, and fourth transistors. An oscillation amplitude of the VCO can be increased by providing a first bias voltage to the transformer to adjust gate bias voltages of the first and second transistors. The oscillation amplitude of the VCO can also be increased by providing a second bias voltage to the transformer to adjust gate bias voltages of the third and the fourth transistors.
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公开(公告)号：US11290093B1
公开(公告)日：2022-03-29
申请号：US17229181
申请日：2021-04-13
Applicant: International Business Machines Corporation
Inventor： Sudipto Chakraborty , Bodhisatwa Sadhu , Wooram Lee
Abstract: A phased array system includes tunable delay elements having active delay element(s) and passive delay element(s). A second resolution by the passive delay element is smaller than a first resolution by the active delay element, and the resolution corresponds to delay applied to an input signal and has discrete steps for phase over which the delay element can be operated. For multiple sets of tunable delay elements, a calibration process sets, for one set of the delay elements, all but an n-th active delay element and the passive delay element to a first phase, and the n-th active delay element to a second phase. In a second set of the delay elements, all of the active delay elements are set to the first phase and the passive delay element is set to the second phase. A phase difference is detected and adjusted to meet a criterion between the two sets.
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Patent Agency Ranking
公开(公告)号：US11177843B2
公开(公告)日：2021-11-16
申请号：US16362639
申请日：2019-03-23
Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
Inventor： Bodhisatwa Sadhu , Duixian Liu , Arun Paidimarri
Abstract: A device includes a transmitter. A main antenna is coupled to the transmitter. A matching network coupled to the transmitter and configured to match an impedance of the main antenna, wherein one or more components of the matching network provide a desired radiation.
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公开(公告)号：US10749489B2
公开(公告)日：2020-08-18
申请号：US15926256
申请日：2018-03-20
Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
Inventor： John F. Bulzacchelli , Bodhisatwa Sadhu , Alberto Valdes Garcia
IPC: H01Q3/26 , H03G3/30 , H01Q21/22 , H01Q3/28 , H01Q3/36 , H03F3/19 , H03F3/45 , H04B1/48 , H01Q1/52 , H03F3/195 , H04B7/06
Abstract: Variable gain amplifiers and methods of designing the same include a first amplifying transistor configured to receive a first input signal and to provide a first amplified output signal based on the first input signal. A phase compensating resistor is connected to the first amplifying transistor and has a resistance calibrated as: R e = τ b C be , par where τb is the base transit time of the first amplifying transistor and Cbe,par is the gain-independent part of the base-emitter capacitance of the first amplifying transistor.
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公开(公告)号：US10680581B2
公开(公告)日：2020-06-09
申请号：US15820480
申请日：2017-11-22
Applicant: International Business Machines Corporation
Inventor： Alberto Valdes Garcia , Wayne H. Woods, Jr. , Bodhisatwa Sadhu
Abstract: An apparatus includes first and second electronically tunable transmission lines configured to transmit or receive a signal pair and provide a selected phase delay difference to the signal pair corresponding to a selected polarization, a first attenuation element connected to the first electronically tunable transmission line and a second attenuation element connected to the second electronically tunable transmission line. The first and second attenuation elements may each be configured to selectively attenuate signals carried on the electronically tunable transmission line to which they are connected according to a selected attenuation setting of a plurality of selectable attenuation settings provided by one or more attenuation control signals and thereby provide a selected attenuation to the signal pair that corresponds to the selected polarization. A corresponding method is also disclosed herein.
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公开(公告)号：US10666191B2
公开(公告)日：2020-05-26
申请号：US15832069
申请日：2017-12-05
Applicant: International Business Machines Corporation
Inventor： Alberto Valdes-Garcia , Bodhisatwa Sadhu
Abstract: A voltage controlled oscillator (VCO), a method of designing a voltage controlled oscillator, and a design structure comprising a semiconductor substrate including a voltage controlled oscillator are disclosed. In one embodiment, the VCO comprises an LC tank circuit for generating an oscillator output at an oscillator frequency, and an oscillator core including cross-coupled semiconductor devices to provide feedback to the tank circuit. The VCO further comprises a supply node, a tail node, and a noise by-pass circuit connected to the supply and tail nodes, in parallel with the tank circuit and the oscillator core. The by-pass circuit forms a low-impedance path at a frequency approximately twice the oscillator frequency to at least partially immunize the oscillator core from external noise and to reduce noise contribution from the cross-coupled semiconductor devices.
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公开(公告)号：US20190132132A1
公开(公告)日：2019-05-02
申请号：US15794201
申请日：2017-10-26
Applicant: International Business Machines Corporation
Inventor： Nicholas S. Kersting , Bodhisatwa Sadhu
Abstract: A method for securely broadcasting information to a group of undisclosed recipients. The information in an information system is encoded by applying a hash function to a group of messages to form the information stream, wherein portions of the information in the information stream are intended for respective ones of the group of undisclosed recipients. The information is encoded such that that only an intended recipient can decode a portion of the information intended for the intended recipient. The information stream is broadcasted to the group of undisclosed recipients.
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