2.
    发明专利
    未知

    公开(公告)号:DE59409726D1

    公开(公告)日:2001-05-17

    申请号:DE59409726

    申请日:1994-12-02

    Abstract: A low-noise amplifier stage with reversible amplification includes a first series circuit of load paths of two transistors which is connected through a resistor to ground. A second series circuit or n series circuits of load paths of two transistors is likewise connected through a resistor to ground and is connected parallel to the first series circuit. Parallel-connected collectors of the first transistors of the series circuits are connected through an oscillator circuit to a supply voltage terminal. Two reference voltage sources are provided for supplying a first reference voltage to base terminals of the first transistors of the series circuits and for supplying a second reference voltage to base terminals of the second transistors of the series circuits. A reversing device connects a node point of the load paths of the transistors of the second series circuit to a supply voltage terminal as a function of a control signal.

    7.
    发明专利
    未知

    公开(公告)号:DE10328570B4

    公开(公告)日:2005-08-25

    申请号:DE10328570

    申请日:2003-06-25

    Abstract: In a method for alignment of an antenna (1) with an adjustable directional characteristic in a mobile station in a mobile radio system, the alignment process is based on determination of two variables as a function of the direction, with the first variable being characteristic of the signal strength (6) and the second variable being characteristic of the signal quality (5, 15), and their evaluation (7). Furthermore, it is possible to make use of position information and alignment information relating inter alia to satellite-based navigation systems, and to take account of the alignment of the user.

    8.
    发明专利
    未知

    公开(公告)号:DE10331572A1

    公开(公告)日:2005-02-03

    申请号:DE10331572

    申请日:2003-07-11

    Abstract: The invention discloses a sigma-delta converter arrangement with a forward path including an amplifier and a quantizer with a clock input, and a feedback path with a D/A converter. The amplifier is coupled to an integrator which is in the form of a resonator with a tunable frequency and is actuated by a frequency synthesizer that also prescribes the clock rate of the quantizer. The synchronization between the quantizer and resonator results in highly accurate matching given inexpensive integratabiliy, which means that the sigma-delta converter is suitable for use in mobile radios, for example.

    Reducing the radiation emitted by a mobile radio terminal with directional emission

    公开(公告)号:GB2404312A

    公开(公告)日:2005-01-26

    申请号:GB0414188

    申请日:2004-06-24

    Abstract: In a method for alignment of an antenna (1) with an adjustable directional characteristic in a mobile station in a mobile radio system, the alignment process is based on determination of two variables as a function of the direction, with the first variable being characteristic of the signal strength (6) and the second variable being characteristic of the signal quality, (e.g. BER) (5, 15), and their evaluation (7). Furthermore, it is possible to make use of position information and alignment information relating to satellite-based navigation systems (eg. GPS) and electronic compass and to take account of the alignment of the user. The user may be told to change alignment by an acoustic signal. The radiation absorbed by the user is minimised.

Patent Agency Ranking