Patents by Inventor Lars Gunnar Torbjorn Grahm

Lars Gunnar Torbjorn Grahm 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).

  • Pre-recorded sigma delta values for power amplifier control
    Patent number: 6097251
    Abstract: In order to increase the resolution of signals input to a power amplifier, this system includes a power control circuit which utilizes sigma delta modulated values which are stored in a memory device. These values, after retrieval from an addressable memory, are supplied only to a low pass filter before being sent to the control input of the power amplifier. The use of sigma delta modulated values can result in a reduction of hardware within the power control circuit of communication devices and increase the signal resolution by moving noise elements from the signal.
    Type: Grant
    Filed: May 29, 1998
    Date of Patent: August 1, 2000
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventors: Anders Khullar, Lars Gunnar Torbjorn Grahm, Karl H.ang.kan Torbjorn Gardenfors, Sven Hans Sebastian Sedvallson