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公开(公告)号：US20190341960A1
公开(公告)日：2019-11-07
申请号：US15971992
申请日：2018-05-04
Applicant: pSemi Corporation
Inventor： Kashish Pal , Vikas Sharma , Sebastian Diebold
Abstract: A hybrid coupler-based T/R switch for use in a TDM system. An output hybrid coupler of a balanced amplifier is used to selectively switch a transmit or receive path to an antenna. During transmission, power at the output of the balanced amplifier is delivered directly to the antenna. During reception, power from the antenna is reflected through ports of the hybrid coupler connected to respective two amplifiers of the balanced amplifier, to constructively combine at a port of the coupler coupled to the receive path, with a ninety degrees phase shift. A pair of shunting switches coupled to the ports of the hybrid coupler connected to the two amplifiers, and a shunting switch coupled to the port coupled to the receive path, control operation of the hybrid coupler-based T/R switch.
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公开(公告)号：US20190140622A1
公开(公告)日：2019-05-09
申请号：US16052337
申请日：2018-08-01
Applicant: pSemi Corporation
Inventor： John Birkbeck , Vikas Sharma , Kashish Pal
Abstract: A phase shifter for altering the phase of a radio frequency signal is disclosed herein. A Lange coupler is used having reflective ports that are coupled to artificial transmission lines. The artificial transmission lines provide a reflection transmission path, the length of which can be determined by digital control lines. Transistors placed along the length of the central trace provide independent paths to ground that serve to shorten the electrical length of the ATL. Accordingly, by selectively turning the transistors on/off, the electrical length of the ATL can be selected and thus the amount of phase delay introduced by the phase shifter.
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公开(公告)号：US20190068298A1
公开(公告)日：2019-02-28
申请号：US16169903
申请日：2018-10-24
Applicant: pSemi Corporation
Inventor： Vikas Sharma , Mark James O'Leary
Abstract: A calibration architecture that enables accurate calibration of radio frequency (RF) integrated circuits (ICs) chips used in transceiver RF systems in a relatively simple testing environment. Embodiments of the invention include one or more on-chip switchable internal calibration paths that enable direct coupling of a portion of the on-chip circuit to an RF test system while isolating other circuitry on the chip. Some embodiments allow interconnection of switchable internal calibration paths between separate IC chips. Still other embodiments utilize internal switches and antenna mutual coupling to provide over-the-air calibration, alone or in combination with direct signal coupling via internal calibration paths. Periodic self-calibration of an RF IC can be performed after initial factory calibration, so that adjustments in desired performance parameters can be made while such an IC is embedded within a final system, and/or to take into account component degradation due to age or other factors.
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4.发明申请公开(公告)号：US20210135656A1
公开(公告)日：2021-05-06
申请号：US17094654
申请日：2020-11-10
Applicant: pSemi Corporation
Inventor： John Birkbeck , Vikas Sharma , Kashish Pal , Mark James O'Leary
Abstract: A phase shifter for altering the phase of a radio frequency signal is disclosed herein. A Lange coupler is used having reflective ports that are coupled to artificial transmission lines. The artificial transmission lines provide a reflection transmission path, the length of which can be determined by digital control lines. Transistors placed along the length of the central trace provide independent paths to ground that serve to shorten the electrical length of the ATL. Accordingly, by selectively turning the transistors on/off, the electrical length of the ATL can be selected and thus the amount of phase delay introduced by the phase shifter.
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公开(公告)号：US10770770B2
公开(公告)日：2020-09-08
申请号：US15855901
申请日：2017-12-27
Applicant: pSemi Corporation
Inventor： Vikas Sharma
Abstract: A low loss, wide band, phase shifter utilizing one or more transformers in presented. In one case, the phase shifter includes a reflective SPDT switch that is coupled to a transformer. In another case, the phase shifter includes a distributed SPDT switch that includes switchable conduction paths having series connected unit elements of a same phase shift. The transformer may be part of an existing circuit and may be reused to provide the functionality of the phase shifter by introducing the reflective or the distributed SPDT switch.
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Patent Agency Ranking
公开(公告)号：US10505511B1
公开(公告)日：2019-12-10
申请号：US16013844
申请日：2018-06-20
Applicant: pSemi Corporation
Inventor： Vikas Sharma , Peter Bacon
Abstract: Digital step attenuator (DSA) and digital phase shifter (DPS) multi-stage circuit architectures that provide for high resolution. Embodiments use a dithering approach to weight bit positions to provide a much finer resolution than the lowest-valued individual stage. Bit position weights for stages are determined so as to enable selection of combinations of n bit positions that provide a desired total attenuation or phase shift range while allowing utilization of the large number of states (2n) available to produce fractional intermediate steps of attenuation or phase shift. The fractional intermediate steps have a resolution finer than the lowest-valued stage. Bit position weights may be determined using a weighting function, including weightings determined from a linear series, a geometric series, a harmonic series, or alternating variants of such series. In some embodiments, at least one bit position has a fixed value that is not determined by the bit position weighting function.
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公开(公告)号：US20190198957A1
公开(公告)日：2019-06-27
申请号：US15855901
申请日：2017-12-27
Applicant: pSemi Corporation
Inventor： Vikas Sharma
Abstract: A low loss, wide band, phase shifter utilizing one or more transformers in presented. In one case, the phase shifter includes a reflective SPDT switch that is coupled to a transformer. In another case, the phase shifter includes a distributed SPDT switch that includes switchable conduction paths having series connected unit elements of a same phase shift. The transformer may be part of an existing circuit and may be reused to provide the functionality of the phase shifter by introducing the reflective or the distributed SPDT switch.
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公开(公告)号：US20180248633A1
公开(公告)日：2018-08-30
申请号：US15965366
申请日：2018-04-27
Applicant: pSemi Corporation
Inventor： Vikas Sharma , Mark James O'Leary
Abstract: A calibration architecture that enables accurate calibration of radio frequency (RF) integrated circuits (ICs) chips used in transceiver RF systems in a relatively simple testing environment. Embodiments of the invention include one or more on-chip switchable internal calibration paths that enable direct coupling of a portion of the on-chip circuit to an RF test system while isolating other circuitry on the chip. Some embodiments allow interconnection of switchable internal calibration paths between separate IC chips. Still other embodiments utilize internal switches and antenna mutual coupling to provide over-the-air calibration, alone or in combination with direct signal coupling via internal calibration paths. Periodic self-calibration of an RF IC can be performed after initial factory calibration, so that adjustments in desired performance parameters can be made while such an IC is embedded within a final system, and/or to take into account component degradation due to age or other factors.
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公开(公告)号：US12040769B2
公开(公告)日：2024-07-16
申请号：US18082360
申请日：2022-12-15
Applicant: pSemi Corporation
Inventor： Vikas Sharma , Peter Bacon
IPC: H03H11/20 , H03H7/20 , H03H7/25 , H03H11/24 , H03K17/687
CPC classification number: H03H7/25 , H03H7/20 , H03H11/20 , H03H11/245 , H03K17/687
Abstract: Digital step attenuator (DSA) and digital phase shifter (DPS) multi-stage circuit architectures that provide for high resolution. Embodiments use a dithering approach to weight bit positions to provide a much finer resolution than the lowest-valued individual stage. Bit position weights for stages are determined so as to enable selection of combinations of n bit positions that provide a desired total attenuation or phase shift range while allowing utilization of the large number of states (2n) available to produce fractional intermediate steps of attenuation or phase shift. The fractional intermediate steps have a resolution finer than the lowest-valued stage. Bit position weights may be determined using a weighting function, including weightings determined from a linear series, a geometric series, a harmonic series, or alternating variants of such series. In some embodiments, at least one bit position has a fixed value that is not determined by the bit position weighting function.
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公开(公告)号：US20210203374A1
公开(公告)日：2021-07-01
申请号：US17141857
申请日：2021-01-05
Applicant: pSemi Corporation
Inventor： Kashish Pal , Vikas Sharma , Sebastian Diebold , Leland Gilreath , Daoud Salameh , Farshid Aryanfar
Abstract: A hybrid coupler-based T/R switch for use in a TDM system. An output hybrid coupler of a balanced amplifier is used to selectively switch a transmit or receive path to an antenna. During transmission, power at the output of the balanced amplifier is delivered directly to the antenna. During reception, power from the antenna is reflected through ports of the hybrid coupler connected to respective two amplifiers of the balanced amplifier, to constructively combine at a port of the coupler coupled to the receive path, with a ninety degrees phase shift. A pair of shunting switches or series switches coupled to the ports of the hybrid coupler connected to the two amplifiers, and a shunting switch coupled to the port coupled to the receive path, control operation of the hybrid coupler-based T/R switch. An additional switch coupled to the port of the coupler that is coupled to the receive path can provide a bypass path for reception or transmission through the antenna while bypassing the balanced amplifier of the transmit path and an amplifier of the receive path.
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