Patents by Inventor Niall Shakeshaft

Niall Shakeshaft 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: 20070237258
    Abstract: A method and arrangement is shown for measuring an indicator of delay mismatch between a phase information path and an amplitude information path of a polar modulator. In the solution according to the invention a substantially sinusoidal measurement signal (301, 302) is injected both into the amplitude information path (351) and into the phase information path (352). An indicator of the delay mismatch is obtained by measuring a quantity that is proportional to a difference between power represented by a lower side band of a spectrum of a polar modulated signal and power represented by an upper side band of the spectrum.
    Type: Application
    Filed: April 11, 2006
    Publication date: October 11, 2007
    Inventor: Niall Shakeshaft
  • 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: 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
  • Publication number: 20050191976
    Abstract: An RF transmitter uses two digital-to-RF conversion modules to convert digital baseband signals into RF signals. In Cartesian mode, baseband signals are conveyed to the conversion modules for RF conversion. In polar mode, baseband signals are converted into amplitude and phase data parts. Phase data part is converted into I and Q data parts to be converted by the conversion modules into RF signals, which are modulated in a power amplifier by amplitude data part through the power supply of the power amplifier. Each digital-to-RF module uses parallel unit cells to perform D/A conversion function and upconversion function by an IF signal. Each unit cell, adapted to receive a control voltage indicative of a data signal value, is a mixer cell type converter having a differential data switch section connected in series to a differential LO-switch pair. LO-switch is further connected in series to a current source.
    Type: Application
    Filed: April 29, 2005
    Publication date: September 1, 2005
    Inventors: Niall Shakeshaft, Jussi Vepsalainen, Petri Eloranta, Pauli Seppinen
  • Publication number: 20050190854
    Abstract: A polar transmitter, operable in linear mode or switched mode, uses a conversion module to convert baseband signals into amplitude data and phase data. The phase data is used to phase modulate a carrier frequency in a RF conversion module. The module comprises a plurality of parallel unit cells, each being a mixer cell type converter having a differential data switch section connected in series to a differential LO-switch pair. The differential LO-switch is connected in series to a current source. Each unit cell is adapted to receive a signal through an input end. In switched mode, the phase-modulated carrier frequency is amplitude modulated by the amplitude data through the supply voltage to a power amplifier. In linear mode, amplitude data is conveyed to the input end of the unit cells for modulating the phase-modulated carrier frequency in the conversion module.
    Type: Application
    Filed: April 29, 2005
    Publication date: September 1, 2005
    Inventors: Niall Shakeshaft, Jussi Vepsalainen, Petri Eloranta, Pauli Seppinen
  • Publication number: 20050111573
    Abstract: An RF transmitter having two digital to RF-conversion devices that combine the D/A conversion function and the upconversion function by a RF-carrier or IF-signal. The device comprises a plurality of parallel unit cells, each of which is a mixer cell type converter having a differential data switch section connected in series to a differential LO-switch pair. The differential LO-switch is further connected in series to a current source. Each unit cell is adapted to receive a control voltage indicative of a data signal value.
    Type: Application
    Filed: November 12, 2004
    Publication date: May 26, 2005
    Inventors: Niall Shakeshaft, Jussi Vepsalainen, Petri Eloranta, Pauli Seppinen