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13 条记录 (耗时 0.009 秒)

    System and method for a programmable gain amplifier
    1.
    发明公开
    System and method for a programmable gain amplifier 有权
    系统和方法，用于可编程放大器

    公开(公告)号：EP1331732A3

    公开(公告)日：2005-02-16

    申请号：EP03001574.7

    申请日：2003-01-23

    申请人： Broadcom Corporation

    发明人： Sobel, David A.

    IPC分类号： H03G3/00

    CPC分类号： H03G1/0088 ,  H03F3/45192 ,  H03F3/4539 ,  H03F3/45739 ,  H03F3/45995 ,  H03F2203/45521 ,  H03F2203/45594 ,  H03F2203/45601 ,  H03F2203/45616 ,  H03F2203/45698 ,  H03F2203/45726

    摘要： Provided is system for an improved programmable gain amplifier (PGA). The system includes an amplifier and a first gain control mechanism. The first gain control mechanism includes a circuit input port and is positioned along a feedback path of the amplifier. The first gain control mechanism is configured to (i) receive an input signal and (ii) moderate gains applied to the received input signal, the applied gains including gain values of greater than or equal to one. A second gain control mechanism is coupled to the first gain control mechanism and is integrated with a function of the amplifier. The second gain control mechanism (i) provides gain values of less than one and (ii) decreases a feedback factor of the amplifier when the gain values are provided having values of less than one.

    System and method for a startup circuit for a differential CMOS amplifier
    8.
    发明公开
    System and method for a startup circuit for a differential CMOS amplifier 有权
    的系统和方法的CMOS差动放大器的起动电路

    公开(公告)号：EP1347571A3

    公开(公告)日：2005-02-09

    申请号：EP03001572.1

    申请日：2003-01-23

    申请人： Broadcom Corporation

    发明人： Sobel, David A.

    IPC分类号： H03F1/30 ,  H03F3/45

    CPC分类号： H03F3/45739 ,  H03F3/45192 ,  H03F3/4539 ,  H03F2203/45521 ,  H03F2203/45594 ,  H03F2203/45601 ,  H03F2203/45616 ,  H03F2203/45698 ,  H03F2203/45726 ,  H03G1/0088

    摘要： A system is provided for correcting start-up deficiencies in an amplifier. The system includes a comparing device configured to (i) receive a second circuit node voltage and a reference voltage as inputs, (ii) compare the received second circuit node voltage and the reference voltage, and (iii) produce a compensating voltage signal based upon the comparison. Next, an active device has a control terminal connected to an output port of the comparing device and is configured to receive the compensating voltage signal. The active device also includes an output terminal connected to the control terminal of the second active device, and a common terminal connected to a first circuit node. Another active device has a control terminal connected to the output port of the comparing device and is configured to receive the compensating voltage signal. The other active device also has an output terminal connected to the control terminal of the first active device, and a common terminal connected to the first circuit node.