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    • 31. 发明授权
    • Method and apparatus for controlling oscillator duty cycle
    • 控制振荡器占空比的方法和装置
    • US5481228A
    • 1996-01-02
    • US138276
    • 1993-10-15
    • Rajeev Badyal
    • Rajeev Badyal
    • H03B5/36H03K3/017H03K3/03H03K19/0948
    • H03K3/0315H03B5/366H03K3/017
    • A controller circuit adjusts the output signal duty cycle of an oscillator circuit. The controller circuit changes the effective bias voltage of an amplifier in a Pierce oscillator by enabling a sequence of transistor stages. Changes to the amplifier bias voltage proportionally alter the duty cycle of the oscillator output signal. Each transistor stage includes a first and second transistor selectively coupled in parallel with the amplifier. Each transistor in the circuit has smaller process parameters than the amplifier transistors so that the amplifier bias voltage can be incrementally increased or decreased to produce an output signal with a high precision duty cycle.
    • 控制器电路调节振荡器电路的输出信号占空比。 控制器电路通过启用晶体管级的序列来改变Pierce振荡器中放大器的有效偏置电压。 放大器偏置电压的变化会成比例地改变振荡器输出信号的占空比。 每个晶体管级包括与放大器并联选择性地耦合的第一和第二晶体管。 电路中的每个晶体管具有比放大器晶体管更小的工艺参数,使得放大器偏置电压可以递增地增加或减小以产生具有高精度占空比的输出信号。
    • 38. 发明授权
    • Optical mouse with uniform level detection method
    • 光电鼠标具有均匀的电平检测方法
    • US07907120B2
    • 2011-03-15
    • US11154008
    • 2005-06-15
    • Gary B. GordonDerek L. KneeRajeev BadyalJason T. Hartlove
    • Gary B. GordonDerek L. KneeRajeev BadyalJason T. Hartlove
    • G09G5/08G06F3/033
    • G06F3/03543G06F3/0317G06F3/033G06F3/0346G06F3/038
    • Movement of an optical mouse may be tracked by providing a source of non-coherent light in a movable housing for illuminating a work surface at a low angle of incidence, providing a two dimensional array of photo detectors for producing arrays of data elements responsive to light reflected from surface irregularities on the illuminated work surface and providing circuitry for capturing a first array of data elements from the two dimensional array of photo detectors at a first time, for detecting a characteristic condition in the first array, for capturing a second array of data elements at a second time, and for tracking movement of the housing relative to the work surface by comparing at least some of the data elements of the first array with at least some of the data elements of the second array if the characteristic condition is not detected in the first array. Movement may be tracked by providing a source of non-coherent light in a movable housing for illuminating a work surface at a low angle of incidence, providing a two dimensional array of photo detectors for producing arrays of data elements responsive to light reflected from surface irregularities on the illuminated work surface and providing circuitry for tracking movement of the housing relative to the work surface by comparing light reflected from the surface irregularities at a first time with light reflected there from at a second time unless the light reflected at the first time does not include a characteristic condition.
    • 可以通过在可移动壳体中提供非相干光源来跟踪光学鼠标的移动,以便以低入射角照射工作表面,提供二维阵列的光电检测器,用于产生响应于光的数据元件阵列 从照明工作表面上的表面不规则反射并提供用于在第一时间从光电检测器的二维阵列捕获数据元素的第一阵列的电路,用于检测第一阵列中的特征状态,用于捕获第二数据阵列 如果没有检测到特征条件,则通过将第一阵列的至少一些数据元素与第二阵列的至少一些数据元素进行比较来跟踪壳体相对于工作表面的移动 在第一个数组。 可以通过在可移动壳体中提供非相干光源来跟踪运动,以便以低入射角照射工作表面,提供二维阵列的光电检测器,用于响应于从表面不规则反射的光而产生数据元素阵列 在照明工作表面上并且提供电路,用于通过将来自第一时间的表面凹凸反射的光与第二时间反射的光相比较来跟踪壳体相对于工作表面的移动,除非第一次反射的光不是 包括特征条件。