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    • 3. 发明申请
    • Front end automatic gain control circuit using a control word generator
    • US20060120492A1
    • 2006-06-08
    • US11337120
    • 2006-01-19
    • Syed Rahman
    • Syed Rahman
    • H04L27/08
    • H03G3/001H03G3/3052
    • A control word generator comprised of circuitry to generate a control word to control an attenuator. The control word generator includes a counter that increments at a clock rate much higher than the refresh rate at which the error signal is recalculated. The counter is controlled by a comparator which compares the error signal to a reference value, which, starting from a programmable upper limited is decremented in the counter's incrementation rate by a programmable step size. When the reference value equals the error signal, the comparator changes state and the counter stops incrementing. The count at that time is the control word, which if everything operated instantaneously, would be the control word that would alter the attenuation sufficiently to achieve nominal power. Also disclosed is a method to use this apparatus to generate a table of control words comprising: first establish an input power level and attenuate the signal with an analog variable attenuator/amplifier; second, measuring the output power of the signal output by said variable attenuator/amplifier; third, use a control word generator to iteratively derive a control word, which will cause the input signal power to be altered to the nominal power level; fourth, record that control word; fifth, increment the input signal power and repeat the process to derive a new control word and record that word; and, sixth, repeat the entire process for each level of expected input signal power.
    • 4. 发明授权
    • Process and apparatus for modulating terminal voltage of battery
    • 电池端子电压调制方法及装置
    • US5990664A
    • 1999-11-23
    • US050310
    • 1998-03-30
    • Syed Rahman
    • Syed Rahman
    • G01R31/36H02J7/00
    • H02J7/0065
    • The present invention provides a method and apparatus for converting the terminal voltage of a battery so that one or more operations (such as shut-down, save-to-disk, and the like) begin at the appropriate point on the discharge curve for various cell chemistries. A control circuit is provided for triggering end-of-discharge operations based on various predetermined points, such as remaining capacity, voltage, temperature, and safety for devices which utilize a predetermined terminal voltage measurement to trigger one or more operations. The control circuit modulates the terminal voltage of the battery to a value which substantially matches the predetermined terminal voltage threshold of the device upon reaching a predetermined point, thereby successfully triggering operations at the appropriate time. The control circuitry also can modulate the terminal voltage to maintain it above the threshold to delay triggering of one or more operations. The method and apparatus of the present invention provides a solution in the electronic circuitry of the battery to allow devices designed for use with cells of a certain chemistry be able to suspend operations without losing data or delay operations to avoid wasting battery capacity when used with cell chemistries different than those for which the devices were designed.
    • 本发明提供了一种用于转换电池的端子电压的方法和装置,使得在放电曲线上的适当点处开始一个或多个操作(诸如关闭,保存到盘等),用于各种 细胞化学。 提供了一种控制电路,用于基于各种预定点(例如利用预定的端子电压测量来触发一个或多个操作的装置的剩余容量,电压,温度和安全性)触发终止放电操作。 控制电路在达到预定点时将电池的端子电压调制到与装置的预定端子电压阈值基本一致的值,从而在适当的时间成功地触发操作。 控制电路还可以调制端子电压以将其保持在阈值以上以延迟触发一个或多个操作。 本发明的方法和装置提供电池电子电路中的解决方案,以允许设计用于某一化学物质的电池的设备能够暂停操作而不丢失数据或延迟操作,以避免当与电池一起使用时浪费电池容量 化学物质不同于设备设计的化学物质。