Patents by Inventor Jorma Matero

Jorma Matero 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: 7742748
    Abstract: A transmission signal to be transmitted from a radio transmitter is predistorted in order to compensate for the signal distortion caused by a power amplifier. The transmission signal and a signal modeling a power supply voltage applied to the power amplifier are compared with distortion properties of the power amplifier using these signals. The distortion information is comprised in an amplitude distortion lookup table and a phase distortion lookup table. Transmission signal and power supply signal values are associated with envelope and phase predistortion information comprised in the respective lookup tables and the envelope and the phase of the transmission signal is predistorted accordingly.
    Type: Grant
    Filed: January 25, 2007
    Date of Patent: June 22, 2010
    Assignee: Nokia Corporation
    Inventors: Jorma Matero, Marko J. Alanen, Jussi H. Vepsäläinen, Jaako Maunuksela
  • Patent number: 7551688
    Abstract: A method and device for improving the efficiency of an envelope tracking transmitter in which a power amplifier for coupling modulated signals in a carrier frequency to an antenna for transmission. The transmitter comprises a power supply for providing a supply voltage to the power amplifier, and a computation means for providing a waveform indicative of the envelope of the modulated signal to the power supply in order to modify the supply voltage. A lower limit is imposed to the waveform so that the supply voltage to the power supply is always greater than a predetermined value. Moreover, when information is transmitted in times slots which are started and ended by ramp periods, a constant signal, based on the root-mean-square value of the waveform, is used to modify the waveform so that the supply voltage to the power amplifier includes a constant voltage level in the ramp periods.
    Type: Grant
    Filed: April 18, 2002
    Date of Patent: June 23, 2009
    Assignee: Nokia Corporation
    Inventors: Jorma Matero, Jarkko Kesti
  • Patent number: 7522676
    Abstract: A test signal comprising a periodic waveform, such as a triangular waveform and sawtooth waveform, is used for propagation delay matching in a transceiver front-end. The test signal is separately fed to the envelope path and the RF path. At the power amplifier stage, a phase modulator is used to obtain the envelope signal and the phase modulated RF signal for demodulation by an IQ demodulator. At the output end of the IQ demodulator, the I-signal is measured while the delay block is adjusted in order to vary the propagation delay. When the propagation delay matching is correct, the peak-to-peak value of the I-signal is a minimum. Preferably, during calibration using the test signal, the transmitter RF power amplifier is disabled so that no spurious signals will be sent. The transmitter can be an EDGE polar transmitter, a non-EDGE transmitter or a EER polar transmitter.
    Type: Grant
    Filed: February 6, 2006
    Date of Patent: April 21, 2009
    Assignee: Nokia Corporation
    Inventor: Jorma Matero
  • Patent number: 7522011
    Abstract: A radio frequency modulator based on direct frequency/phase modulation of output signal of a controllable oscillator (724) that is a part of a phase locked loop (PLL) provides a direct modulator that is able to operate over a wide frequency range with a flat frequency response. A modulation signal is digitally processed (721, 730) before injection to a high-pass path of a direct modulator. Applicability of digital signal processing is based on the fact that the modulation signal is a base band signal. Therefore, the modulation signal (702) occupies such a band in the frequency domain so that a sufficient ratio of a sampling rate to an upper edge frequency of the modulation signal can be achieved. Digital processing is used for compensating an effect of non-flat high-pass PLL transfer function and/or to perform pre-distortion of the input signal of a controlled oscillator to compensate an effect of non-linearity of a controlled oscillator.
    Type: Grant
    Filed: August 15, 2005
    Date of Patent: April 21, 2009
    Assignee: Nokia Corporation
    Inventors: Jorma Matero, Niall Eric Shakeshaft
  • Patent number: 7519336
    Abstract: The invention relates to optimizing efficiency of a power amplifier of a transmitter. In a solution according to the invention a detected envelope (306) of an input signal of the power amplifier is filtered with a non-linear filter (307) that substantially preserves a rise time of a peak in a waveform of the envelope but lengthens a temporal duration of the peak. A filtered envelope is used as an input quantity (308) for a control system that controls a supply voltage of the power amplifier. For the control system it is easier to react to peaks of the filtered envelope than to the peaks of the envelope because the temporal duration of the peaks of the filtered envelope is longer than that of the peaks of the envelope.
    Type: Grant
    Filed: May 5, 2006
    Date of Patent: April 14, 2009
    Assignee: Nokia Corporation
    Inventors: Jussi Vepsäläinen, Jorma Matero
  • Publication number: 20080139140
    Abstract: A transmission signal to be transmitted from a radio transmitter is predistorted in order to compensate for the signal distortion caused by a power amplifier. The transmission signal and a signal modeling a power supply voltage applied to the power amplifier are compared with distortion properties of the power amplifier using these signals. The distortion information is comprised in an amplitude distortion lookup table and a phase distortion lookup table. Transmission signal and power supply signal values are associated with envelope and phase predistortion information comprised in the respective lookup tables and the envelope and the phase of the transmission signal is predistorted accordingly.
    Type: Application
    Filed: January 25, 2007
    Publication date: June 12, 2008
    Inventors: Jorma Matero, Marko J. Alanen, Jussi H. Vepsalainen, Jaako Maunuksela
  • Publication number: 20070258602
    Abstract: The invention relates to optimizing efficiency of a power amplifier of a transmitter. In a solution according to the invention a detected envelope (306) of an input signal of the power amplifier is filtered with a non-linear filter (307) that substantially preserves a rise time of a peak in a waveform of the envelope but lengthens a temporal duration of the peak. A filtered envelope is used as an input quantity (308) for a control system that controls a supply voltage of the power amplifier. For the control system it is easier to react to peaks of the filtered envelope than to the peaks of the envelope because the temporal duration of the peaks of the filtered envelope is longer than that of the peaks of the envelope.
    Type: Application
    Filed: May 5, 2006
    Publication date: November 8, 2007
    Inventors: Jussi Vepsalainen, Jorma Matero
  • Publication number: 20070183532
    Abstract: A test signal comprising a periodic waveform, such as a triangular waveform and sawtooth waveform, is used for propagation delay matching in a transceiver front-end. The test signal is separately fed to the envelope path and the RF path. At the power amplifier stage, a phase modulator is used to obtain the envelope signal and the phase modulated RF signal for demodulation by an IQ demodulator. At the output end of the IQ demodulator, the I-signal is measured while the delay block is adjusted in order to vary the propagation delay. When the propagation delay matching is correct, the peak-to-peak value of the I-signal is a minimum. Preferably, during calibration using the test signal, the transmitter RF power amplifier is disabled so that no spurious signals will be sent. The transmitter can be an EDGE polar transmitter, a non-EDGE transmitter or a EER polar transmitter.
    Type: Application
    Filed: February 6, 2006
    Publication date: August 9, 2007
    Inventor: Jorma Matero
  • Patent number: 7236542
    Abstract: An RF transceiver having dual-mode envelope restoration architecture. In narrow-band applications such as GSM/EDGE, a switch-mode amplifier is used to provide an envelope signal for amplitude modulating the phase-modulated signals. To achieve required modulation bandwidth in wide-band applications such as WDCMA, an analog amplifier is used to provide the envelope signal. Furthermore, in the wide-band mode, the envelope modulation is applied through the base of an emitter follower while the collector voltage is scaled to achieve a desired power output in the amplitude-modulated signals.
    Type: Grant
    Filed: September 19, 2006
    Date of Patent: June 26, 2007
    Assignee: Nokia Corporation
    Inventor: Jorma Matero
  • Publication number: 20070036238
    Abstract: A radio frequency modulator based on direct frequency/phase modulation of output signal of a controllable oscillator (724) that is a part of a phase locked loop (PLL) provides a direct modulator that is able to operate over a wide frequency range with a flat frequency response. A modulation signal is digitally processed (721, 730) before injection to a high-pass path of a direct modulator. Applicability of digital signal processing is based on the fact that the modulation signal is a base band signal. Therefore, the modulation signal (702) occupies such a band in the frequency domain so that a sufficient ratio of a sampling rate to an upper edge frequency of the modulation signal can be achieved. Digital processing is used for compensating an effect of non-flat high-pass PLL transfer function and/or to perform pre-distortion of the input signal of a controlled oscillator to compensate an effect of non-linearity of a controlled oscillator.
    Type: Application
    Filed: August 15, 2005
    Publication date: February 15, 2007
    Inventors: Jorma Matero, Niall Shakeshaft
  • Publication number: 20070019757
    Abstract: An RF transceiver having dual-mode envelope restoration architecture. I narrow-band applications such as GSM/EDGE, a switch-mode amplifier is used to provide an envelope signal for amplitude modulating the phase-modulated signals. To achieve required modulation bandwidth in wide-band applications such as WDCMA, an analog amplifier is used to provide the envelope signal. Furthermore, in the wide-band mode, the envelope modulation is applied through the base of an emitter follower while the collector voltage is scaled to achieve a desired power output in the amplitude-modulated signals.
    Type: Application
    Filed: September 19, 2006
    Publication date: January 25, 2007
    Inventor: Jorma Matero
  • Publication number: 20070014382
    Abstract: A transmission device and method are shown, wherein an amplification is implemented which can be changed between a switched operation mode and linear operation mode as desired, depending on which mode of operation best meets the needs of the radio system in use. This opens the possibility of using the same hardware for different systems.
    Type: Application
    Filed: July 15, 2005
    Publication date: January 18, 2007
    Inventors: Niall Shakeshaft, Esko Jarvinen, Marko Alanen, Vlad Grigore, Jorma Matero, Jarkko Kesti
  • Patent number: 7123664
    Abstract: An RF transceiver having dual-mode envelope restoration architecture. In narrow-band applications such as GSM/EDGE, a switch-mode amplifier is used to provide an envelope signal for amplitude modulating the phase-modulated signals. To achieve required modulation bandwidth in wide-band applications such as WDCMA, an analog amplifier is used to provide the envelope signal. Furthermore, in the wide-band mode, the envelope modulation is applied through the base of an emitter follower while the collector voltage is scaled to achieve a desired power output in the amplitude-modulated signals.
    Type: Grant
    Filed: September 17, 2002
    Date of Patent: October 17, 2006
    Assignee: Nokia Corporation
    Inventor: Jorma Matero
  • Publication number: 20040052312
    Abstract: An RF transceiver having dual-mode envelope restoration architecture. In narrow-band applications such as GSM/EDGE, a switch-mode amplifier is used to provide an envelope signal for amplitude modulating the phase-modulated signals. To achieve required modulation bandwidth in wide-band applications such as WDCMA, an analog amplifier is used to provide the envelope signal. Furthermore, in the wide-band mode, the envelope modulation is applied through the base of an emitter follower while the collector voltage is scaled to achieve a desired power output in the amplitude-modulated signals.
    Type: Application
    Filed: September 17, 2002
    Publication date: March 18, 2004
    Applicant: NOKIA CORPORATION
    Inventor: Jorma Matero
  • Publication number: 20030198300
    Abstract: A method and device for improving the efficiency of an envelope tracking transmitter in which a power amplifier for coupling modulated signals in a carrier frequency to an antenna for transmission. The transmitter comprises a power supply for providing a supply voltage to the power amplifier, and a computation means for providing a waveform indicative of the envelope of the modulated signal to the power supply in order to modify the supply voltage. A lower limit is imposed to the waveform so that the supply voltage to the power supply is always greater than a predetermined value. Moreover, when information is transmitted in times slots which are started and ended by ramp periods, a constant signal, based on the root-mean-square value of the waveform, is used to modify the waveform so that the supply voltage to the power amplifier includes a constant voltage level in the ramp periods.
    Type: Application
    Filed: April 18, 2002
    Publication date: October 23, 2003
    Applicant: Nokia Corporation
    Inventors: Jorma Matero, Jarkko Kesti
  • Patent number: 6215988
    Abstract: A dual band user terminal (10) includes a controller (18) for outputting a BAND signal for specifying operation in one of a first frequency band or a second, higher frequency band; a single frequency synthesizer (46) that is responsive to the BAND signal for outputting an RF signal in one of two frequency bands; and an RF transceiver (11) comprising a dual band receiver that receives RF signals in the first frequency band and in the second, higher frequency band, and a dual band transmitter that transmits RF signals in the same frequency bands.
    Type: Grant
    Filed: May 27, 1999
    Date of Patent: April 10, 2001
    Assignee: Nokia Mobile Phones, Ltd.
    Inventor: Jorma Matero
  • Patent number: 6125266
    Abstract: This invention teaches methods and apparatus for providing a low cost, low complexity, and low component count transmitter feedback function for use in mobile station transmitter linearization and self-test operations. Disclosed is a method for operating a mobile station of a type that includes a transmit chain having an output coupled to an antenna and a receive chain having an input coupled to the same or a different antenna.
    Type: Grant
    Filed: December 31, 1997
    Date of Patent: September 26, 2000
    Assignee: Nokia Mobile Phones Limited
    Inventors: Jorma Matero, Kari Kananen
  • Patent number: 6115585
    Abstract: Disclosed are various embodiments of circuitry for coupling first and second transceivers of a dual band radio telephone to integral and external antennas. The circuitry uses impedance matching lengths of transmission lines and switches arranged to provide a minimum insertion loss. Also disclosed is an embodiment for use with a single band radio telephone, such as a digital TDMA radio telephone that either transmits or receives at any given time. Also disclosed is an antenna switching arrangement for a dual band phone that eliminates a requirement for duplexers.
    Type: Grant
    Filed: January 6, 1998
    Date of Patent: September 5, 2000
    Assignee: Nokia Mobile Phones Limited
    Inventors: Jorma Matero, Matti I Kangas
  • Patent number: 5974305
    Abstract: A dual band user terminal (10) includes a controller (18) for outputting a BAND signal for specifying operation in one of a first frequency band or a second, higher frequency band; a single frequency synthesizer (46) that is responsive to the BAND signal for outputting an RF signal in one of two frequency bands; and an RF transceiver (11) comprising a dual band receiver that receives RF signals in the first frequency band and in the second, higher frequency band, and a dual band transmitter that transmits RF signals in the same frequency bands.
    Type: Grant
    Filed: May 15, 1997
    Date of Patent: October 26, 1999
    Assignee: Nokia Mobile Phones Limited
    Inventor: Jorma Matero
  • Patent number: 5898406
    Abstract: A diplexer for coupling plural electronic circuits to a common antenna, wherein the antenna has at least a portion which is in the shape of a rod. The diplexer includes a set of dielectric sleeves encircling the rod-shaped portion of the antenna. The diplexer is constructed of plural branches, each of which has a filter for passing signals in a portion of the spectrum different from the portions of the spectra passed by other ones of the branches. Inductors and capacitors employed in respective ones of the branches are formed by electrical elements disposed on surfaces of the sleeves. Such elements include bands of electrically conductive material which serve as plates of capacitors, and elongated conductive strips which serve as inductors. Resistive material may also be placed on surfaces of the sleeves for construction of resistors of the branches in the event that such resistors are required in the electrical filtering.
    Type: Grant
    Filed: March 13, 1997
    Date of Patent: April 27, 1999
    Assignee: Nokia Mobile Phones Limited
    Inventor: Jorma Matero