15.
    发明专利
    未知

    公开(公告)号:DE59709210D1

    公开(公告)日:2003-03-06

    申请号:DE59709210

    申请日:1997-05-12

    Inventor: WEBER STEPHAN

    Abstract: Three analog multiplying stages (1-3) each consisting of a differential amplifier with emitter-coupled transistors (e.g. 4,5) receive respective input signals (17-19) at the base of one transistor of each pair while the base of the other is earthed (23). Another multiplying stage (25) is identically constructed to receive a first reference signal from a source (40) and potential divider (41,42). The output of this stage is compared (38) with a second reference signal (Us). The result of the comparison is used to derive the control signals for the current-bank output transistors (28-34) in the coupled emitter circuits of all stages.

    16.
    发明专利
    未知

    公开(公告)号:DE59704710D1

    公开(公告)日:2001-10-31

    申请号:DE59704710

    申请日:1997-07-14

    Inventor: WEBER STEPHAN

    Abstract: The circuit applies the output of a buffer amplifier of the received signal to a comparator, both directly and via a switched chain. This pref. includes symmetrical all-pass (phase-shifting) and low-pass filters and a track-and-hold series resistance/shunt capacitance/amplifier combination. The filters are integrated into one unit incorporating amplifiers (14,24) with feedback capacitances (16,26). The all-pass section comprises two resistance chains which are (11,2;1,22) cross-coupled by capacitances (15,25). The step response is initially negative but shortly passes through a zero, whereupon the DC signal component is stored and subtracted.

    CIRCUIT FOR SUPPLYING A BASE OPERATING VOLTAGE FOR A BIPOLAR TRANSISTOR AND AMPLIFYING CIRCUIT

    公开(公告)号:AU2003246660A1

    公开(公告)日:2004-02-02

    申请号:AU2003246660

    申请日:2003-07-08

    Abstract: A circuit for providing a base operating voltage for a bipolar transistor includes a U BE multiplier providing, in response to a working-point control current, a working voltage fed to a circuit for reducing the working voltage in order to generate a base operating voltage smaller than a base-emitter voltage drop of a bipolar power transistor. With this, the bipolar power transistor may be maintained in the class C operation in a flexible and robust manner, so that an amplifier with high efficiency is obtained.

    20.
    发明专利
    未知

    公开(公告)号:DE10231156A1

    公开(公告)日:2004-01-29

    申请号:DE10231156

    申请日:2002-07-10

    Abstract: A circuit for providing a base operating voltage for a bipolar transistor includes a U BE multiplier providing, in response to a working-point control current, a working voltage fed to a circuit for reducing the working voltage in order to generate a base operating voltage smaller than a base-emitter voltage drop of a bipolar power transistor. With this, the bipolar power transistor may be maintained in the class C operation in a flexible and robust manner, so that an amplifier with high efficiency is obtained.

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