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    • 8. 发明授权
    • Line driver calibration circuit
    • 线路驱动器校准电路
    • US6160851A
    • 2000-12-12
    • US32547
    • 1998-02-26
    • Gary A. BrownJitendra Mohan
    • Gary A. BrownJitendra Mohan
    • H04L25/02H04B17/00
    • H04L25/0272H04L25/0266H04L25/0286
    • A calibration circuit adjusts a differential output voltage from a line driver circuit when the differential output voltage falls outside a specified tolerance range. The calibration circuit includes a sample and hold circuit which samples the differential output voltage and holds a representative signal. A comparator compares the held signal with a reference voltage signal. When the held signal is greater than the reference voltage signal the comparator outputs a LOW signal and when the held signal is less than the reference voltage signal the comparator outputs a HIGH signal. The comparator output signal is stored in a memory circuit of a control logic. The control logic instructs an up/down counter to increment when the comparator output is LOW and to decrement when the comparator output is HIGH. A calibration current source sinks a unit of calibration current when the comparator output is LOW and sources a unit of calibration current when the comparator output is HIGH. The calibration current is added to an input current to calibrate the differential output voltage towards the specified tolerance range. In a next cycle of the calibration sequence, if a new comparator output signal is different from that stored in the memory circuit, the calibration sequence ceases. However, if the new comparator output signal is the same as that stored in the memory circuit the calibration sequence continues.
    • 当差分输出电压超出指定的公差范围时,校准电路调节来自线路驱动器电路的差分输出电压。 校准电路包括采样和保持电路,其对差分输出电压进行采样并保持代表信号。 比较器将保持的信号与参考电压信号进行比较。 当保持信号大于参考电压信号时,比较器输出低电平信号,当保持信号小于参考电压信号时,比较器输出高电平信号。 比较器输出信号存储在控制逻辑的存储电路中。 当比较器输出为低电平时,控制逻辑指令升/降计数器递增,当比较器输出为高电平时,该指令递减。 当比较器输出为低电平时,校准电流源吸收一个校准电流单位,当比较器输出为高电平时,校准电流源产生校准电流单位。 将校准电流添加到输入电流,以将差分输出电压校准到指定的公差范围。 在校准序列的下一个周期中,如果新的比较器输出信号与存储电路中存储的输出信号不同,校准序列将停止。 然而,如果新的比较器输出信号与存储电路中存储的信号相同,校准序列将继续。
    • 9. 发明授权
    • Power conservation system and method
    • 省电系统及方法
    • US07184798B1
    • 2007-02-27
    • US10264216
    • 2002-10-03
    • Gary A. BrownNeal Lane Horovitz
    • Gary A. BrownNeal Lane Horovitz
    • H04B1/38H04M1/00
    • H04B1/1615H04W52/0254H04W52/0258H04W52/0283H04W52/029Y02D70/40
    • A power management circuit is arranged to apply power to and remove power from its own oscillator to conserve power. A power-on reset circuit provides a power-on-reset signal to a state machine. The state machine contains states that are programmed with information that is used to power up or down various subsystems within a device that includes the power management systems, including the oscillator of the state machine. The state machine assumes a known state and applies power to the oscillator in response to the power-on-reset signal. The state machine changes states in response to system events (e.g., a keypress). The state machine also maintains power to the oscillator during the period of time and which the state machine requires clock signal from the oscillator. The state machine can power down the oscillator to conserve power when the state machine does not require a clock signal from the oscillator.
    • 电源管理电路被设置为从其自己的振荡器施加功率并去除电力以节省功率。 上电复位电路向状态机提供上电复位信号。 状态机包含用用于在包括电源管理系统的设备(包括状态机的振荡器)的设备内的各种子系统上电或下电的信息的状态。 状态机采取已知状态,并响应于上电复位信号向振荡器供电。 状态机响应于系统事件(例如,按键)而改变状态。 状态机还在一段时间内维持振荡器的电源,并且状态机需要来自振荡器的时钟信号。 当状态机不需要来自振荡器的时钟信号时,状态机可以关闭振荡器以节省电力。
    • 10. 发明授权
    • Transformable mechanic's creeper assembly
    • 可变形机械师的爬行器总成
    • US06398234B1
    • 2002-06-04
    • US09616911
    • 2000-07-14
    • Gary A. Brown
    • Gary A. Brown
    • B25H500
    • B25H5/00
    • A transformable mechanic's creeper assembly for providing support to the user in either a recumbent or sitting position with selectable height. The transformable mechanic's creeper assembly includes a first deck assembly, a seat assembly, a second deck assembly couplable to either the first deck assembly or the seat assembly, a plurality of spacing members couplable to the deck and seat assemblies adapted for adjusting the overall height of the assemblies, and a plurality of wheels couplable to the spacing members.
    • 一种可变形的机械师的爬行器组件,用于在具有可选高度的卧式或坐姿位置向用户提供支撑。 可变形的机械师的爬行器组件包括第一甲板组件,座椅组件,可联接到第一甲板组件或座椅组件的第二甲板组件,可连接到甲板的多个间隔构件和适于调整总体高度的座椅组件 所述组件和可与所述间隔构件联接的多个轮。