Patents by Inventor Scott D. Kee

Scott D. Kee 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).

  • Patent number: 8577312
    Abstract: A system for controlling amplifier power is provided. The system includes a voltage envelope detector receiving a voltage signal and generating an attenuated voltage envelope signal. A current envelope detector receives a current signal and generates an attenuated current envelope signal. A controller receives power level data and generates attenuation control data for the voltage envelope signal and the current envelope signal. A detector receives the voltage envelope signal and the current envelope signal and generates a control signal based on the greater of the voltage envelope signal and the current envelope signal. A power amplifier level controller receives the control signal and generates a power amplifier level control signal.
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: November 5, 2013
    Assignee: Axiom Microdevices, Inc.
    Inventors: Rahul Magoon, Scott D. Kee, Seyed-Ali Hajimiri, Ichiro Aoki, Roberto Aparicio Joo, Morten Damgaard, Setu Mohta, Geoff Hatcher
  • Patent number: 8362839
    Abstract: A cross-differential amplifier is provided. The cross-differential amplifier includes an inductor connected to a direct current power source at a first terminal. A first and second switch, such as transistors, are connected to the inductor at a second terminal. A first and second amplifier are connected at their supply terminals to the first and second switch. The first and second switches are operated to commutate the inductor between the amplifiers so as to provide an amplified signal while limiting the ripple voltage on the inductor and thus limiting the maximum voltage imposed across the amplifiers and switches.
    Type: Grant
    Filed: July 29, 2011
    Date of Patent: January 29, 2013
    Assignee: California Institute of Technology
    Inventors: Seyed-Ali Hajimiri, Scott D. Kee, Ichiro Aoki
  • Patent number: 8350625
    Abstract: A power amplifier circuit comprising a scalable power amplifier including an input and an output, and a plurality of activated amplifier elements operative to produce an output signal at the output, and operative to dynamically vary a power output level of the output signal. A variable impedance circuit operatively responsive to dynamically load the output of the scalable power amplifier. Wherein the scalable power amplifier further includes an amplifier configuration circuit operatively responsive to selectively activate the selectively activated amplifier elements by at least reducing power to at least one of the selectively activated amplifier elements.
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: January 8, 2013
    Assignee: California Institute of Technology
    Inventors: Abbas Komijani, Seyed-Ali Hajimiri, Scott D. Kee, Ichiri Aoki
  • Patent number: 8242855
    Abstract: An integrated power combiner is disclosed. The power combiner includes a first circular geometry primary winding having one or more inductive elements, such as an active winding with one or more driver stages. A circular geometry secondary winding is disposed adjacent to the first primary winding, such as an active winding with one or more driver stages. A second circular geometry primary winding is disposed adjacent to the secondary winding and has one or more inductive elements. One or more connections are provided between one or more of the inductive elements of the first circular geometry primary winding and one or more of the inductive elements of the second circular geometry primary winding.
    Type: Grant
    Filed: March 29, 2011
    Date of Patent: August 14, 2012
    Assignee: Axiom Microdevices, Inc.
    Inventors: Scott D. Kee, Ichiro Aoki, Hui Wu, Seyed-Ali Hajimiri, Frank Carr, Rahul Magoon, Alexander Kral, Afshin Mellati, Florian Bohn, Donald McClymont
  • Publication number: 20120176200
    Abstract: A cross-differential amplifier is provided. The cross-differential amplifier includes an inductor connected to a direct current power source at a first terminal. A first and second switch, such as transistors, are connected to the inductor at a second terminal. A first and second amplifier are connected at their supply terminals to the first and second switch. The first and second switches are operated to commutate the inductor between the amplifiers so as to provide an amplified signal while limiting the ripple voltage on the inductor and thus limiting the maximum voltage imposed across the amplifiers and switches.
    Type: Application
    Filed: July 29, 2011
    Publication date: July 12, 2012
    Inventors: Seyed-Ali Hajimiri, Scott D. Kee, Ichiri Aoki
  • Publication number: 20120001692
    Abstract: Reconfigurable distributed active transformers are provided. The exemplary embodiments provided allow changing of the effective number and configuration of the primary and secondary windings, where the distributed active transformer structures can be reconfigured dynamically to control the output power levels, allow operation at multiple frequency bands, maintain a high performance across multiple channels, and sustain desired characteristics across process, temperature and other environmental variations. Integration of the distributed active transformer power amplifiers and a low noise amplifier on a semiconductor substrate can also be provided.
    Type: Application
    Filed: September 13, 2011
    Publication date: January 5, 2012
    Inventors: Abbas Komijani, Seyed-Ali Hajimiri, Scott D. Kee, Ichiri Aoki
  • Publication number: 20120001693
    Abstract: A system for controlling amplifier power is provided. The system includes a voltage envelope detector receiving a voltage signal and generating an attenuated voltage envelope signal. A current envelope detector receives a current signal and generates an attenuated current envelope signal. A controller receives power level data and generates attenuation control data for the voltage envelope signal and the current envelope signal. A detector receives the voltage envelope signal and the current envelope signal and generates a control signal based on the greater of the voltage envelope signal and the current envelope signal. A power amplifier level controller receives the control signal and generates a power amplifier level control signal.
    Type: Application
    Filed: September 13, 2011
    Publication date: January 5, 2012
    Inventors: Rahul Magoon, Scott D. Kee, Seyed-Ali Hajimiri, Ichiro Aoki, Roberto Aparicio Joo, Morten Damgaard, Setu Mohta, Geoff Hatcher
  • Patent number: 8049563
    Abstract: The present invention discloses a distributed power amplifier topology and device that efficiently and economically enhances the power output of an RF signal to be amplified. The power amplifier comprises a plurality of push-pull amplifiers interconnected in a novel circular geometry that preferably function as a first winding of an active transformer having signal inputs of adjacent amplification devices driven with an input signal of equal magnitude and opposite phase. The topology also discloses the use of a secondary winding that matches the geometry of primary winding and variations thereof that serve to efficiently combine the power of the individual power amplifiers. The novel architecture enables the design of low-cost, fully-integrated, high-power amplifiers in the RF, microwave, and millimeter-wave frequencies.
    Type: Grant
    Filed: September 12, 2008
    Date of Patent: November 1, 2011
    Assignee: California Institute of Technology
    Inventors: Ichiro Aoki, Seyed-Ali Hajimiri, David B. Ruthledge, Scott D. Kee
  • Patent number: 8018283
    Abstract: Reconfigurable distributed active transformers are provided. The exemplary embodiments provided allow changing of the effective number and configuration of the primary and secondary windings, where the distributed active transformer structures can be reconfigured dynamically to control the output power levels, allow operation at multiple frequency bands, maintain a high performance across multiple channels, and sustain desired characteristics across process, temperature and other environmental variations. Integration of the distributed active transformer power amplifiers and a low noise amplifier on a semiconductor substrate can also be provided.
    Type: Grant
    Filed: June 8, 2010
    Date of Patent: September 13, 2011
    Assignee: California Institute of Technology
    Inventors: Abbas Komijani, Seyed-Ali Hajimiri, Scott D. Kee, Ichiro Aoki
  • Patent number: 7999621
    Abstract: A cross-differential amplifier is provided. The cross-differential amplifier includes an inductor connected to a direct current power source at a first terminal. A first and second switch, such as transistors, are connected to the inductor at a second terminal. A first and second amplifier are connected at their supply terminals to the first and second switch. The first and second switches are operated to commutate the inductor between the amplifiers so as to provide an amplified signal while limiting the ripple voltage on the inductor and thus limiting the maximum voltage imposed across the amplifiers and switches.
    Type: Grant
    Filed: January 12, 2010
    Date of Patent: August 16, 2011
    Assignee: California Institute of Technology
    Inventors: Seyed-Ali Hajimiri, Scott D. Kee, Ichiro Aoki
  • Publication number: 20110175685
    Abstract: An integrated power combiner is disclosed. The power combiner includes a first circular geometry primary winding having one or more inductive elements, such as an active winding with one or more driver stages. A circular geometry secondary winding is disposed adjacent to the first primary winding, such as an active winding with one or more driver stages. A second circular geometry primary winding is disposed adjacent to the secondary winding and has one or more inductive elements. One or more connections are provided between one or more of the inductive elements of the first circular geometry primary winding and one or more of the inductive elements of the second circular geometry primary winding.
    Type: Application
    Filed: March 29, 2011
    Publication date: July 21, 2011
    Inventors: Scott D. KEE, Ichiro AOKI, Hui WU, Seyed-Ali HAJIMIRI, Frank CARR, Rahul MAGOON, Alexandre KRAL, Afshin MELLATI, Florian BOHN, Donald McCLYMONT
  • Patent number: 7915960
    Abstract: An integrated power combiner is disclosed. The power combiner includes a first circular geometry primary winding having one or more inductive elements, such as an active winding with one or more driver stages. A circular geometry secondary winding is disposed adjacent to the first primary winding, such as an active winding with one or more driver stages. A second circular geometry primary winding is disposed adjacent to the secondary winding and has one or more inductive elements. One or more connections are provided between one or more of the inductive elements of the first circular geometry primary winding and one or more of the inductive elements of the second circular geometry primary winding.
    Type: Grant
    Filed: July 19, 2010
    Date of Patent: March 29, 2011
    Assignee: Axiom Microdevices, Inc.
    Inventors: Scott D. Kee, Ichiro Aoki, Hui Wu, Seyed-Ali Hajimiri, Frank Carr, Rahul Magoon, Alexandre Kral, Afshin Mellati, Florian Bohn, Donald McClymont
  • Patent number: 7904045
    Abstract: A phase detector includes a plurality of phase detectors located in a phase correction loop, each phase detector configured to receive as input a radio frequency (RF) input signal and an RF reference signal, each of the plurality of phase detectors also configured to provide a signal representing a different phase offset based on the phase difference between the RE input signal and the RF reference signal; and a switch configured to receive an output of each of the plurality of phase detectors and configured to select the output representing the phase offset, that is closest to a phase of an output of an amplifier.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: March 8, 2011
    Assignee: Axiom Microdevices, Inc.
    Inventors: Ichiro Aoki, Scott D. Kee, Dongjiang Qiao, Alyosha C. Molnar
  • Patent number: 7894546
    Abstract: A power amplifier includes a power amplifier core in which a transmit signal having an amplitude-modulated (AM) component and a phase-modulated (PM) component is passed and amplified, the power amplifier comprising a forward path, and an additional amplification device configured to generate an output that is proportional to an output of the power amplifier core, such that the output of the additional amplification device indirectly controls the output of the power amplifier core.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: February 22, 2011
    Assignee: Axiom Microdevices, Inc.
    Inventors: Rahul Magoon, Roberto Aparicio Joo, Scott D. Kee, Ichiro Aoki
  • Publication number: 20100283548
    Abstract: An integrated power combiner is disclosed. The power combiner includes a first circular geometry primary winding having one or more inductive elements, such as an active winding with one or more driver stages. A circular geometry secondary winding is disposed adjacent to the first primary winding, such as an active winding with one or more driver stages. A second circular geometry primary winding is disposed adjacent to the secondary winding and has one or more inductive elements. One or more connections are provided between one or more of the inductive elements of the first circular geometry primary winding and one or more of the inductive elements of the second circular geometry primary winding.
    Type: Application
    Filed: July 19, 2010
    Publication date: November 11, 2010
    Inventors: Scott D. Kee, Ichiro Aoki, Hui Wu, Seyed-Ali Hajimiri, Frank Carr, Rahul Magoon, Alexandre Kral, Afshin Mellati, Florian Bohn, Donald McClymont
  • Publication number: 20100244955
    Abstract: Reconfigurable distributed active transformers are provided. The exemplary embodiments provided allow changing of the effective number and configuration of the primary and secondary windings, where the distributed active transformer structures can be reconfigured dynamically to control the output power levels, allow operation at multiple frequency bands, maintain a high performance across multiple channels, and sustain desired characteristics across process, temperature and other environmental variations. Integration of the distributed active transformer power amplifiers and a low noise amplifier on a semiconductor substrate can also be provided.
    Type: Application
    Filed: June 8, 2010
    Publication date: September 30, 2010
    Inventors: Abbas Komijani, Seyed-Ali Hajimiri, Scott D. Kee, Ichiro Aoki
  • Patent number: 7756491
    Abstract: A phase shifter includes a plurality of variable gain elements, each variable gain element configured to receive one of a plurality of input signals, each input signal having a phase that is shifted with respect to each other input signal; and a control signal supplied to each variable gain element, where the control signals define a phase shift.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: July 13, 2010
    Assignee: Axiom Microdevices, Inc.
    Inventors: Scott D. Kee, Ichiro Aoki, Weifeng Feng
  • Patent number: 7733183
    Abstract: Reconfigurable distributed active transformers are provided. The exemplary embodiments provided allow changing of the effective number and configuration of the primary and secondary windings, where the distributed active transformer structures can be reconfigured dynamically to control the output power levels, allow operation at multiple frequency bands, maintain a high performance across multiple channels, and sustain desired characteristics across process, temperature and other environmental variations. Integration of the distributed active transformer power amplifiers and a low noise amplifier on a semiconductor substrate can also be provided.
    Type: Grant
    Filed: February 8, 2008
    Date of Patent: June 8, 2010
    Assignee: California Institute of Technology
    Inventors: Abbas Komijani, Seyed-Ali Hajimiri, Scott D. Kee, Ichiro Aoki
  • Publication number: 20100117733
    Abstract: A cross-differential amplifier is provided. The cross-differential amplifier includes an inductor connected to a direct current power source at a first terminal. A first and second switch, such as transistors, are connected to the inductor at a second terminal. A first and second amplifier are connected at their supply terminals to the first and second switch. The first and second switches are operated to commutate the inductor between the amplifiers so as to provide an amplified signal while limiting the ripple voltage on the inductor and thus limiting the maximum voltage imposed across the amplifiers and switches.
    Type: Application
    Filed: January 12, 2010
    Publication date: May 13, 2010
    Applicant: CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Seyed-Ali Hajimiri, Scott D. Kee, Ichiro Aoki
  • Patent number: RE45974
    Abstract: An integrated power combiner is disclosed. The power combiner includes a first circular geometry primary winding having one or more inductive elements, such as an active winding with one or more driver stages. A circular geometry secondary winding is disposed adjacent to the first primary winding, such as an active winding with one or more driver stages. A second circular geometry primary winding is disposed adjacent to the secondary winding and has one or more inductive elements. One or more connections are provided between one or more of the inductive elements of the first circular geometry primary winding and one or more of the inductive elements of the second circular geometry primary winding.
    Type: Grant
    Filed: November 12, 2013
    Date of Patent: April 12, 2016
    Assignee: AXIOM MICRODEVICES, INC.
    Inventors: Scott D. Kee, Ichiro Aoki, Hui Wu, Seyed-Ali Hajimiri, Frank Carr, Rahul Magoon, Alexander Kral, Afshin Mellati, Florian Bohn, Donald McClymont