Patents by Inventor Per-Olof Brandt

Per-Olof Brandt 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).

  • Publication number: 20230387958
    Abstract: A multi-antenna transceiver system is disclosed. The system comprises a group of transceiver chips, wherein each transceiver chip has a respective chip-associated (e.g., on-chip) frequency generator configured to provide a respective conversion frequency, and wherein each transceiver chip is configured to use the respective conversion frequency for on-chip frequency conversion of a transceiver signal. The system also comprises a controller adapted to cause configuration of the respective chip-associated frequency generator of at least one of the transceiver chips, wherein the configuration comprises dynamically setting the respective conversion frequency. In some embodiments, the controller comprises a single piece of circuitry separate from the transceiver chips. The single piece of circuitry is adapted to cause configuration of the respective chip-associated frequency generator of two or more of the transceiver chips.
    Type: Application
    Filed: October 7, 2021
    Publication date: November 30, 2023
    Inventors: Bengt Lindoff, Per-Olof Brandt, Jonas Lindstrand
  • Publication number: 20230318655
    Abstract: A multi-antenna transceiver system including a group of transceiver chips, and a reference frequency generator configured to provide a reference frequency for each transceiver chip. Each transceiver chip has a respective chip-associated (e.g., on-chip) frequency generator configured to provide a respective conversion frequency based on the reference frequency, wherein each respective conversion frequency is higher than the reference frequency. Each transceiver chip is configured to use the respective conversion frequency for on-chip frequency conversion of a transceiver signal. The reference frequency may be provided directly to each transceiver chip of the group or may be provided directly to a first transceiver chip of the group and to a second transceiver chip of the group via the first transceiver chip.
    Type: Application
    Filed: October 7, 2021
    Publication date: October 5, 2023
    Inventors: Bengt Lindoff, Per-Olof Brandt, Jonas Lindstrand
  • Patent number: 10644728
    Abstract: A MIMO transceiver has a plurality of analog processing subsystems that each includes at least one antenna, a duplexer, at least one power amplifier, at least one mixer, an interface connectable to a baseband processing subsystem, and the MIMO transceiver has one or more analog radio frequency processing chips. Each analog processing subsystem of the plurality of analog processing subsystems is on a single one of the analog radio frequency processing chips, and each analog radio frequency processing chip comprises a metallization on at least one side of the chip and wherein the metallization comprises integration of the at least one antenna.
    Type: Grant
    Filed: March 2, 2019
    Date of Patent: May 5, 2020
    Assignee: BEAMMWAVE AB
    Inventors: Markus Törmänen, Per-Olof Brandt
  • Publication number: 20190199380
    Abstract: A MIMO transceiver has a plurality of analog processing subsystems that each includes at least one antenna, a duplexer, at least one power amplifier, at least one mixer, an interface connectable to a baseband processing subsystem, and the MIMO transceiver has one or more analog radio frequency processing chips. Each analog processing subsystem of the plurality of analog processing subsystems is on a single one of the analog radio frequency processing chips, and each analog radio frequency processing chip comprises a metallization on at least one side of the chip and wherein the metallization comprises integration of the at least one antenna.
    Type: Application
    Filed: March 2, 2019
    Publication date: June 27, 2019
    Inventors: Markus TÖRMÄNEN, Per-Olof BRANDT
  • Patent number: 10263646
    Abstract: An analog processing subsystem is disclosed. Said subsystem comprising at least one antenna (202,302), a duplexer (202a,302a), at least one power amplifier (203a,203b), at least one mixer (204a,204b, 304a, 304b) and an interface connectable to a baseband processing subsystem. The at least one mixer (204a,204b,304a,304b) is adapted to down-convert and inphase/quadrature—IQ—demodulate a received analog radio frequency signal, received by the at least one antenna (202,302), to provide a received analog baseband signal and to IQ-modulate and up-convert a transmit analog baseband signal, to be transmitted by the at least one antenna (202, 302), to provide a transmit analog radio frequency signal. The analog processing subsystem is comprised on a single analog radio frequency processing chip (201,301) comprising a metallization on at least one side of the chip for integration of the at least one antenna (202,302).
    Type: Grant
    Filed: September 8, 2016
    Date of Patent: April 16, 2019
    Assignee: BEAMMWAVE AB
    Inventors: Markus Törmänen, Per-Olof Brandt
  • Publication number: 20180219563
    Abstract: An analog processing subsystem is disclosed. Said subsystem comprising at least one antenna (202,302), a duplexer (202a,302a), at least one power amplifier (203a,203b), at least one mixer (204a,204b, 304a, 304b) and an interface connectable to a baseband processing subsystem. The at least one mixer (204a,204b,304a,304b) is adapted to down-convert and inphase/quadrature—IQ—demodulate a received analog radio frequency signal, received by the at least one antenna (202,302), to provide a received analog baseband signal and to IQ-modulate and up-convert a transmit analog baseband signal, to be transmitted by the at least one antenna (202, 302), to provide a transmit analog radio frequency signal. The analog processing subsystem is comprised on a single analog radio frequency processing chip (201,301) comprising a metallization on at least one side of the chip for integration of the at least one antenna (202,302).
    Type: Application
    Filed: September 8, 2016
    Publication date: August 2, 2018
    Inventors: Markus TÖRMÄNEN, Per-Olof BRANDT
  • Patent number: 8269572
    Abstract: Signal modulation apparatus for applying a modulation signal to a carrier signal, the apparatus comprising: an amplitude modulator for modulating the amplitude of the carrier signal in accordance with a control signal; first mixing means for mixing together fractions of the carrier signal before and after action of the amplitude modulator to produce a first detection signal indicative of the amplitude modulation applied by the amplitude modulator; and detection means for comparing the control signal with a first detection signal to evaluate distortion in the first detection signal as compared with the control signal.
    Type: Grant
    Filed: February 26, 2009
    Date of Patent: September 18, 2012
    Assignee: Cambridge Silicon Radio Limited
    Inventor: Per-Olof Brandt
  • Patent number: 7944294
    Abstract: An apparatus for amplifying a signal. The apparatus includes an amplifier powered by a power supply, a monitor that monitors an output signal of the amplifier and a controller operative to adjust the power supply if distortion is detected in the output signal of the amplifier by the monitor.
    Type: Grant
    Filed: June 27, 2008
    Date of Patent: May 17, 2011
    Assignee: Cambridge Silicon Radio Limited
    Inventors: Steven Robert Jones, Per-Olof Brandt
  • Publication number: 20100327988
    Abstract: Signal modulation apparatus for applying a modulation signal to a carrier signal, the apparatus comprising: an amplitude modulator for modulating the amplitude of the carrier signal in accordance with a control signal; first mixing means for mixing together fractions of the carrier signal before and after action of the amplitude modulator to produce a first detection signal indicative of the amplitude modulation applied by the amplitude modulator; and detection means for comparing the control signal with a first detection signal to evaluate distortion in the first detection signal as compared with the control signal.
    Type: Application
    Filed: February 26, 2009
    Publication date: December 30, 2010
    Applicant: CAMBRIDGE SILICON RADIO LIMITED
    Inventor: Per-Olof Brandt
  • Publication number: 20090322422
    Abstract: Apparatus for amplifying a signal, the apparatus comprising an amplifier (12) powered by a power supply (14), a monitor (20) for monitoring an output signal of the amplifier (12) and a controller (22) operative to adjust the power supply (14) if distortion is detected in the output signal of the amplifier (12) by the monitor (20).
    Type: Application
    Filed: June 27, 2008
    Publication date: December 31, 2009
    Applicant: CAMBRIDGE SILICON RADIO LIMITED
    Inventors: Steven Robert Jones, Per-Olof Brandt
  • Patent number: 7330072
    Abstract: A radio frequency (RF) power amplifier, including an external control loop and a protection circuit, which functions to maintain a constant output power during variations in impedance on the RF load. In the external control loop a collector current from an output transistor is detected and then regulated with respect to a reference current. The regulated signal is utilised to generate a bias control signal which is input to the base electrode of both a driver transistor and the output transistor. The protection circuit detects a voltage envelope at the collector electrode of the output transistor and utilises this signal to form a bias reduction signal which is input to the base electrode of the driver transistor.
    Type: Grant
    Filed: July 21, 2003
    Date of Patent: February 12, 2008
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Per-Olof Brandt
  • Patent number: 7330073
    Abstract: Predistortion that will compensate for distortion introduced by a power amplifier circuit is determined by applying a time-varying reference signal to the power amplifier circuit, wherein at each moment the time-varying reference signal has a reference amplitude and a reference phase. A corresponding output signal supplied by the power amplifier circuit is measured, wherein at each moment the output signal has a measured amplitude and a measured phase. Amplitude predistortion is determined by comparing the reference amplitude with the measured amplitude, and phase predistortion is determined by comparing the reference phase with the measured phase. A relationship between the phase predistortion and the reference amplitude is determined such that, for any value of the reference amplitude, a corresponding value of the phase predistortion is identified.
    Type: Grant
    Filed: June 29, 2005
    Date of Patent: February 12, 2008
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Jonas Persson, Per-Olof Brandt
  • Patent number: 7268618
    Abstract: A method of controlling output power in a power amplifier having a driver stage and an output stage. The driver current is measured and the output stage biased in dependence upon the measured driver current.
    Type: Grant
    Filed: May 19, 2003
    Date of Patent: September 11, 2007
    Assignee: Telefonktiebolaget LM Ericsson (publ)
    Inventor: Per-Olof Brandt
  • Patent number: 7197284
    Abstract: The present invention provides a transceiver circuit that includes a transmission amplifier coupled with an antenna input/output node. The transmission amplifier is configured to amplify communications to be transmitted from the transceiver circuit. The transceiver circuit further includes a receiver and a field effect transistor. The receiver includes a receiver input coupled with the antenna input/output node. The field effect transistor is coupled between the receiver input and an electrical reference. The field effect transistor is configured to provide an open circuit when communications are received at the receiver input and to provide a closed circuit when communications are not being received at the receiver input.
    Type: Grant
    Filed: April 25, 2003
    Date of Patent: March 27, 2007
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Per-Olof Brandt, Jesper Olsander
  • Patent number: 7145385
    Abstract: RF polar modulation circuit has a self-compensated temperature stable envelope controller and self-compensated temperature stable power amplifier bias. The circuit has an adaptive current-to-voltage modulation interface with pre-distortion compensation capability. AM/PM distortion are compensated for envelope dependent power amplifier transistor biasing. Automatic compensation is provided for RF loads that are higher or lower than nominal loads. This Abstract is provided to comply with rules requiring an Abstract that allows a searcher or other reader to quickly ascertain subject matter of the technical disclosure. This Abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).
    Type: Grant
    Filed: June 17, 2004
    Date of Patent: December 5, 2006
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Per-Olof Brandt, Jonas Persson
  • Patent number: 7138861
    Abstract: Coupler-based amplifiers provide a measure of load mismatch based on the difference between the two output signal amplitudes from the amplifiers. This measure can be used to control variable matching networks (VMNs) or amplifier supply voltages to maintain constant distortion levels and high power transfer/efficiency and even to control output power. Load mismatch is measured by comparing the amplifier device output amplitudes and adjusting the circuit based on the comparison to counteract undesired behavior, such as increasing distortion levels.
    Type: Grant
    Filed: December 29, 2004
    Date of Patent: November 21, 2006
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Lars Sundström, Per-Olof Brandt
  • Publication number: 20060139092
    Abstract: Coupler-based amplifiers provide a measure of load mismatch based on the difference between the two output signal amplitudes from the amplifiers. This measure can be used to control variable matching networks (VMNs) or amplifier supply voltages to maintain constant distortion levels and high power transfer/efficiency and even to control output power. Load mismatch is measured by comparing the amplifier device output amplitudes and adjusting the circuit based on the comparison to counteract undesired behavior, such as increasing distortion levels.
    Type: Application
    Filed: December 29, 2004
    Publication date: June 29, 2006
    Inventors: Lars Sundstrom, Per-Olof Brandt
  • Patent number: 7062237
    Abstract: A circuit for regulating the power provided to a load connected to an output of a power amplifier. The circuit includes an amplitude detector that outputs a voltage corresponding to the amplitude of the signal outputted by the power amplifier. This output voltage is a function of the impedance of the load. Thus, when the impedance of the load changes, the output voltage also changes. Given a constant current into the load, it is the load impedance that determines the power delivered to the load. Therefore, because the output voltage reflects changes in the impedance of the load, the output voltage can be used by a regulator circuit to maintain a constant output power, regardless of changes in the impedance of the load.
    Type: Grant
    Filed: June 5, 2001
    Date of Patent: June 13, 2006
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Per-Olof Brandt
  • Publication number: 20060071711
    Abstract: Predistortion that will compensate for distortion introduced by a power amplifier circuit is determined by applying a time-varying reference signal to the power amplifier circuit, wherein at each moment the time-varying reference signal has a reference amplitude and a reference phase. A corresponding output signal supplied by the power amplifier circuit is measured, wherein at each moment the output signal has a measured amplitude and a measured phase. Amplitude predistortion is determined by comparing the reference amplitude with the measured amplitude, and phase predistortion is determined by comparing the reference phase with the measured phase. A relationship between the phase predistortion and the reference amplitude is determined such that, for any value of the reference amplitude, a corresponding value of the phase predistortion is identified.
    Type: Application
    Filed: June 29, 2005
    Publication date: April 6, 2006
    Inventors: Jonas Persson, Per-Olof Brandt
  • Publication number: 20060066396
    Abstract: A radio frequency (RF) power amplifier, including an external control loop and a protection circuit, which functions to maintain a constant output power during variations in impedance on the RF load. In the external control loop a collector current from an output transistor is detected and then regulated with respect to a reference current. The regulated signal is utilised to generate a bias control signal which is input to the base electrode of both a driver transistor and the output transistor. The protection circuit detects a voltage envelope at the collector electrode of the output transistor and utilises this signal to form a bias reduction signal which is input to the base electrode of the driver transistor.
    Type: Application
    Filed: July 21, 2003
    Publication date: March 30, 2006
    Inventor: Per-Olof Brandt