Patents by Inventor Iason Vassiliou
Iason Vassiliou 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: 10396845Abstract: A communication system includes a conversion module configured to convert a signal between a radio frequency baseband (RF-BB) and an intermediate frequency (IF). At least one RF front-end module converts the signal between the IF and a radio frequency (RF). The RF front-end module is configured as an RF phased array and includes a coaxial interconnect configured to connect the conversion module with the RF front-end module. The signal is transmitted between the conversion module and the RF-front end module via the coaxial interconnect. At least one RF front-end module includes an active front-end (AFE) configured to allow the signal to be transmitted via the coaxial interconnect while minimizing any deterioration of the signal.Type: GrantFiled: February 28, 2017Date of Patent: August 27, 2019Assignee: Maxlinear Asia Singapore PTE LTDInventors: Iason Vassiliou, Michael Boers, Sean Nicolson, Brima Ibrahim, Spyridon Kavvadias
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Publication number: 20170179999Abstract: A communication system includes a conversion module configured to convert a signal between a radio frequency baseband (RF-BB) and an intermediate frequency (IF). At least one RF front-end module converts the signal between the IF and a radio frequency (RF). The RF front-end module is configured as an RF phased array and includes a coaxial interconnect configured to connect the conversion module with the RF front-end module. The signal is transmitted between the conversion module and the RF-front end module via the coaxial interconnect. At least one RF front-end module includes an active front-end (AFE) configured to allow the signal to be transmitted via the coaxial interconnect while minimizing any deterioration of the signal.Type: ApplicationFiled: February 28, 2017Publication date: June 22, 2017Inventors: Iason Vassiliou, Michael Boers, Sean Nicolson, Brima Ibrahim, Spyridon Kavvadias
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Patent number: 9621330Abstract: A communication system includes a conversion module configured to convert a signal between a radio frequency baseband (RF-BB) and an intermediate frequency (IF). At least one RF front-end module converts the signal between the IF and a radio frequency (RF). The RF front-end module is configured as an RF phased array and includes a coaxial interconnect configured to connect the conversion module with the RF front-end module. The signal is transmitted between the conversion module and the RF-front end module via the coaxial interconnect. At least one RF front-end module includes an active front-end (AFE) configured to allow the signal to be transmitted via the coaxial interconnect while minimizing any deterioration of the signal.Type: GrantFiled: March 30, 2012Date of Patent: April 11, 2017Assignee: Maxlinear Asia Singapore Private LimitedInventors: Iason Vassiliou, Michael Boers, Sean Nicolson, Brima Ibrahim, Spyridon Kavvadias
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Patent number: 9184857Abstract: A method for calibrating a transceiver includes selecting one of a plurality of available calibration paths on the transceiver to be active. The transceiver includes a transmitter and a receiver. The selected one of the plurality of available calibration paths couples the transmitter to the receiver through a circuit that is external to the transceiver. A calibration signal may be provided to enable calibration of the transceiver via the selected one of the plurality of available calibration paths. The calibration signal may be received after it has passed through the selected one of the plurality of calibration paths. Characteristics of the transceiver may be measured using the received calibration signal.Type: GrantFiled: May 11, 2010Date of Patent: November 10, 2015Assignee: BROADCOM CORPORATIONInventors: Iason Vassiliou, Theodore Georgantas, Akira Yamanaka, Konstantinos Vavelidis, Sofoklis Plevridis
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Publication number: 20130137381Abstract: A communication system includes a conversion module configured to convert a signal between a radio frequency baseband (RF-BB) and an intermediate frequency (IF). At least one RF front-end module converts the signal between the IF and a radio frequency (RF). The RF front-end module is configured as an RF phased array and includes a coaxial interconnect configured to connect the conversion module with the RF front-end module. The signal is transmitted between the conversion module and the RF-front end module via the coaxial interconnect. At least one RF front-end module includes an active front-end (AFE) configured to allow the signal to be transmitted via the coaxial interconnect while minimizing any deterioration of the signal.Type: ApplicationFiled: March 30, 2012Publication date: May 30, 2013Applicant: Broadcom CorporationInventors: Iason VASSILIOU, Michael BOERS, Sean NICOLSON, Brima Ibrahim, Spyridon Kavvadias
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Patent number: 8081941Abstract: Aspects of a method and system for an RF front-end calibration scheme using signals from a fractional-N frequency synthesized and received signal strength indicator (RSSI) are provided. A frequency synthesizer within a wireless receiver may generate a signal for dynamically modifying a gain in an integrated low-noise amplifier (LNA) for each selected receiver channel. The frequency-synthesized signals may be applied to at least one tunable load communicatively coupled to the LNA. The tunable load may be an input load or an output load. The signal generated by the frequency synthesizer may be sequentially applied to the input load and the output load. A logarithmic amplifier may generate an RSSI signal from the LNA output during the calibration process. The RSSI signal may be utilized for controlling a tunable load coupled to the LNA and optimize the tuning of the LNA in a desired channel by adjusting the tunable load.Type: GrantFiled: February 22, 2010Date of Patent: December 20, 2011Assignee: Broadcom CorporationInventors: Konstantinos Vavelidis, Charalampos Kapnistis, Iason Vassiliou
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Patent number: 8027376Abstract: Aspects for measuring IQ path mismatch in signal modulation are described. The aspects include estimating a transmitter IQ mismatch in a form of gain and phase response for transmitter I and Q paths sharing a receiver path, and estimating a receiver IQ mismatch in a form of gain and phase response for receiver I and Q paths sharing a signal source. Further included is compensating for the difference of the transmitter and receiver I and Q paths using a digital FIR filter. Iterative estimation is utilized for filter tap parameters during the compensating.Type: GrantFiled: February 6, 2004Date of Patent: September 27, 2011Inventors: Akira Yamanaka, Iason Vassiliou
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Patent number: 7818028Abstract: A communication device may include one or more circuits in an integrated transmitter and receiver that includes a transmit path and a receive path. The transmit path may include an I processing baseband transmit path and a Q processing baseband transmit path. The receive path may include an I processing baseband receive path and a Q processing baseband receive path. The one or more circuits may enable sharing a first common filter by the I processing baseband transmit path and the I processing baseband receive path. The one or more circuits may also enable sharing a second common filter by the Q processing baseband transmit path and the Q processing baseband receive path. The first common filter and the second common filter are independently programmable to adjust a phase and/or a gain of the said first common filter, and/or a phase and/or a gain of the second common filter.Type: GrantFiled: December 8, 2008Date of Patent: October 19, 2010Inventors: Iason Vassiliou, Nikos Haralabidis, Theodore Georgantas, Akira Yamanaka, Konstantinos Vavelidis, Sofoklis Plevridis
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Publication number: 20100233971Abstract: A method for calibrating a transceiver includes selecting one of a plurality of available calibration paths on the transceiver to be active. The transceiver includes a transmitter and a receiver. The selected one of the plurality of available calibration paths couples the transmitter to the receiver through a circuit that is external to the transceiver. A calibration signal may be provided to enable calibration of the transceiver via the selected one of the plurality of available calibration paths. The calibration signal may be received after it has passed through the selected one of the plurality of calibration paths. Characteristics of the transceiver may be measured using the received calibration signal.Type: ApplicationFiled: May 11, 2010Publication date: September 16, 2010Inventors: Iason Vassiliou, Theodore Georgantas, Akira Yamanaka, Konstantinos Vavelidis, Sofoklis Plevridis
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Patent number: 7715836Abstract: A transceiver for transmitting and receiving signals includes a transmitter operative to up-convert baseband signals from a baseband frequency into RF signals at a radio frequency (RF) frequency and output the RF signals, a receiver operative to receive RF signals and down-convert the RF signals into baseband signals having the baseband frequency, and a plurality of calibration paths coupling the transmitter to the receiver. Any of the calibration paths can be selected to be active when calibrating components of the transceiver. Tunable components can use calibration information to optimize transceiver performance.Type: GrantFiled: September 2, 2003Date of Patent: May 11, 2010Inventors: Iason Vassiliou, Theodore Georgantas, Akira Yamanaka, Konstantinos Vavelidis, Sofoklis Plevridis
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Publication number: 20090088086Abstract: A communication device may include one or more circuits in an integrated transmitter and receiver that includes a transmit path and a receive path. The transmit path may include an I processing baseband transmit path and a Q processing baseband transmit path. The receive path may include an I processing baseband receive path and a Q processing baseband receive path. The one or more circuits may enable sharing a first common filter by the I processing baseband transmit path and the I processing baseband receive path. The one or more circuits may also enable sharing a second common filter by the Q processing baseband transmit path and the Q processing baseband receive path. The first common filter and the second common filter are independently programmable to adjust a phase and/or a gain of the said first common filter, and/or a phase and/or a gain of the second common filter.Type: ApplicationFiled: December 8, 2008Publication date: April 2, 2009Inventors: Iason Vassiliou, Nikos Haralabidis, Theodore Georgantas, Akira Yamanaka, Konstantinos Vavelidis, Sofoklis Plevridis
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Patent number: 7463864Abstract: A dual band direct conversion architecture for both the receive (RX) and transmit (TX) path of a communications transceiver that minimizes the transceiver area by sharing common circuits used in both RX and TX paths is disclosed. The transceiver also allows the use of extensive digital calibration in order to achieve performance adequate to support high bit rate modulation schemes.Type: GrantFiled: April 11, 2005Date of Patent: December 9, 2008Assignee: Broadcom CorporationInventors: Iason Vassiliou, Nikos Haralabidis, Theodore Georgantas, Akira Yamanaka, Konstantinos Vavelidis, Sofoklis Plevridis
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Publication number: 20070207759Abstract: Aspects of a method and system for an RF front-end calibration scheme using signals from a fractional-N frequency synthesized and received signal strength indicator (RSSI) are provided. A frequency synthesizer within a wireless receiver may generate a signal for dynamically modifying a gain in an integrated low-noise amplifier (LNA) for each selected receiver channel. The frequency-synthesized signals may be applied to at least one tunable load communicatively coupled to the LNA. The tunable load may be an input load or an output load. The signal generated by the frequency synthesizer may be sequentially applied to the input load and the output load. A logarithmic amplifier may generate an RSSI signal from the LNA output during the calibration process. The RSSI signal may be utilized for controlling a tunable load coupled to the LNA and optimize the tuning of the LNA in a desired channel by adjusting the tunable load.Type: ApplicationFiled: May 11, 2006Publication date: September 6, 2007Inventors: Konstantinos Vavelidis, Charalampos Kapnistis, Iason Vassiliou
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Publication number: 20070066272Abstract: Aspects of a method and system for a multi-band direct conversion CMOS mobile television tuner are provided. A single-chip multi-band RF receiver in a mobile terminal comprising UHF and L-band front-ends receives and amplifies an RF signal utilizing an LNA integrated into the front-end that corresponds to the type of signal received. A received signal strength indicator (RSSI) value may be determined for the amplified signal within the single-chip receiver and may be utilized to adjust a gain of the LNA. The adjustment may be made via on-chip or off-chip processing of the RSSI value. The single-chip receiver may directly convert the amplified signal to a baseband frequency signal and generate in-phase and quadrature components. The components of the baseband frequency signal may be filtered and/or amplified via programmable devices within the single-chip receiver. Circuitry within the single-chip receiver may be controller via an on-chip digital interface.Type: ApplicationFiled: March 21, 2006Publication date: March 22, 2007Inventors: Iason Vassiliou, Konstantinos Vavelidis, Stamatios Bouras, Spyridon Kavadias, Ioannis Kokolakis, Georgios Kamoulakos, Aristeidis Kyranas, Charalampos Kapnistis, Nikolaos Haralabidis
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Publication number: 20070066271Abstract: Certain aspects of a method and system for programmable biasing mechanism for a mobile digital television environment are disclosed. Aspects of one method may include controlling a bias of components within each of a plurality of radio frequency (RF) front-ends that comprise low noise amplifiers (LNAs) integrated within a single chip multi-band RF receiver, and of components within each of a plurality of baseband processors integrated within the single chip multi-band RF receiver. The controlling of the bias is based on signal power measurements within the integrated RF front-ends and within the baseband processors, and each of the plurality of RF front-ends handles processing of at least one of: a received UHF signal and a received L-band signal.Type: ApplicationFiled: March 21, 2006Publication date: March 22, 2007Inventors: Konstantinos Vavelidis, Iason Vassiliou
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Publication number: 20060178165Abstract: A dual band direct conversion architecture for both the receive (RX) and transmit (TX) path of a communications transceiver that minimizes the transceiver area by sharing common circuits used in both RX and TX paths is disclosed. The transceiver also allows the use of extensive digital calibration in order to achieve performance adequate to support high bit rate modulation schemes.Type: ApplicationFiled: April 11, 2005Publication date: August 10, 2006Inventors: Iason Vassiliou, Nikos Haralabidis, Theodore Georgantas, Akira Yamanaka, Konstantinos Vavelidis, Sofoklis Plevridis
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Publication number: 20040217753Abstract: Aspects for measuring IQ path mismatch in signal modulation are described. The aspects include estimating a transmitter IQ mismatch in a form of gain and phase response for transmitter I and Q paths sharing a receiver path, and estimating a receiver IQ mismatch in a form of gain and phase response for receiver I and Q paths sharing a signal source. Further included is compensating for the difference of the transmitter and receiver I and Q paths using a digital FIR filter. Iterative estimation is utilized for filter tap parameters during the compensating.Type: ApplicationFiled: February 6, 2004Publication date: November 4, 2004Inventors: Akira Yamanaka, Iason Vassiliou
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Publication number: 20040106380Abstract: A transceiver for transmitting and receiving signals includes a transmitter operative to up-convert baseband signals from a baseband frequency into RF signals at a radio frequency (RF) frequency and output the RF signals, a receiver operative to receive RF signals and down-convert the RF signals into baseband signals having the baseband frequency, and a plurality of calibration paths coupling the transmitter to the receiver. Any of the calibration paths can be selected to be active when calibrating components of the transceiver. Tunable components can use calibration information to optimize transceiver performance.Type: ApplicationFiled: September 2, 2003Publication date: June 3, 2004Inventors: Iason Vassiliou, Theodore Georgantas, Akira Yamanaka, Konstantinos Vavelidis, Sofoklis Plevridis
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Patent number: 6690657Abstract: A multichannel distributed wireless repeater network, methods for its operation, and system components are disclosed. The network is designed to facilitate high-bit-rate data communication within a home, office, or similarly constrained area. According to the described embodiments, RF radiation outside of the desired network area can be minimized by use of low power transmitter and repeaters, while short paths and uniform signal strength within the network area predominate, facilitating high bit rates. The network utilizes low-power RF transmitters that generally have insufficient power to reliably span the entire network of receivers. To provide uniform coverage throughout the network, channel-shifting repeaters are used. These repeaters pick up a transmitted (or retransmitted) signal on one channel, shift it to a substantially non-interfering channel, and retransmit the signal.Type: GrantFiled: February 25, 2000Date of Patent: February 10, 2004Assignees: Berkeley Concept Research Corporation, Kawasaki Microelectronics, Inc.Inventors: Kam Y. Lau, Iason Vassiliou, Mahesh Venkatraman