Charge pump regulator and method of producing a regulated voltage
    31.
    发明授权
    Charge pump regulator and method of producing a regulated voltage 有权
    电荷泵调节器和产生调节电压的方法

    公开(公告)号:US07888989B2

    公开(公告)日:2011-02-15

    申请号:US12068040

    申请日:2008-02-01

    IPC分类号: G05F1/10

    CPC分类号: H02M3/07 H02M2001/0045

    摘要: A charge pump regulator has a charge pump to establish a charge path and a discharge path alternately, so as to produce a regulated voltage on an output terminal. The charge pump has at least a current control element on the charge path or the discharge path to control the current flowing therethrough according to an output-dependent feedback signal.

    摘要翻译: 电荷泵调节器具有电荷泵,以交替地建立充电路径和放电路径,以便在输出端子上产生调节电压。 电荷泵在充电路径或放电路径上至少具有电流控制元件,以根据输出相关的反馈信号来控制流过其中的电流。

    Perceptually linear LED brightness control
    34.
    发明申请
    Perceptually linear LED brightness control 失效
    感知线性LED亮度控制

    公开(公告)号:US20090195191A1

    公开(公告)日:2009-08-06

    申请号:US12320503

    申请日:2009-01-28

    IPC分类号: H05B37/02

    摘要: A current regulator includes a first current source to provide a reference current varying with a dimming step, and a second current source to generate a drive current for a white LED according to the reference current. The reference current and the dimming step have a relationship identical to or approximating a relationship between luminance and lightness perceived by human eyes. Thus, the white LED is controlled to have a linear variation of the luminance perceived by human eyes when the dimming step is changed.

    摘要翻译: 电流调节器包括:第一电流源,用于提供随着调光步长变化的参考电流;以及第二电流源,以根据参考电流产生白光LED的驱动电流。 参考电流和调光步骤具有与人眼感知的亮度和亮度之间的关系相同或近似的关系。 因此,当改变调光步骤时,白色LED被控制为具有人眼感知的亮度的线性变化。

    Offset cancellation of a single-ended operational amplifier
    35.
    发明申请
    Offset cancellation of a single-ended operational amplifier 有权
    单端运算放大器的偏移消除

    公开(公告)号:US20090128238A1

    公开(公告)日:2009-05-21

    申请号:US12292061

    申请日:2008-11-12

    IPC分类号: H03F3/45

    摘要: A single-ended operational amplifier includes an output stage, a first transconductance amplifier and a second transconductance amplifier. In an offset cancellation mode, two inputs of the first transconductance amplifier are supplied with a reference voltage to sink two currents from two inputs of the output stage respectively, the output stage generates a third current according to the difference between the two currents to charge a capacitor, and the second transconductance amplifier generates two currents according to the voltage in the capacitor to make currents in the two inputs of the output stage equal to each other, thereby canceling the offset of the single-ended operational amplifier.

    摘要翻译: 单端运算放大器包括输出级,第一跨导放大器和第二跨导放大器。 在偏移消除模式中,第一跨导放大器的两个输入端被提供有参考电压,以分别从输出级的两个输入端吸收两个电流,输出级根据两个电流之间的差产生第三电流,以对 电容器和第二跨导放大器根据电容器中的电压产生两个电流,以使输出级的两个输入端中的电流彼此相等,从而消除单端运算放大器的偏移。