Patents by Inventor Tomas Bolin

Tomas Bolin 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).

  • Filter device for suppressing harmonics in radio frequency signals when dual frequencies exist
    Patent number: 6023611
    Abstract: The present invention relates to a power amplifier device (10), switchable for at least two separate basic frequency bands, for radio frequency signals with effective suppression of harmonics, where harmonics, corresponding to a first basic frequency band, can be permitted to overlap the frequency range of at least one second basic frequency band. The power amplifier device (10) comprises a power amplifier (1) and an impedance matching circuit (2), switchable by means of a PIN-diode, which provides a load impedance adapted to each individual basic frequency band. Furthermore, the power amplifier device comprises a filter device (3) comprising a fixed low-pass filter (3b) and a switchable filter (3b) acting as an engageable and disengageable notch filter, which comprises at least one reversible PIN-diode.
    Type: Grant
    Filed: February 13, 1998
    Date of Patent: February 8, 2000
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventors: Tomas Bolin, Per-Olof Brandt, Ulrik Imberg