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    • 42. 发明申请
    • SWITCH WITH INCREASED MAGNETIC SENSITIVITY
    • 开关具有提高的磁性灵敏度
    • US20110210808A1
    • 2011-09-01
    • US12713390
    • 2010-02-26
    • Tang MinOlivier Le NeelRavi Shankar
    • Tang MinOlivier Le NeelRavi Shankar
    • H01H1/00H01H9/00H01H11/00
    • H01H1/0036
    • Switches that are actuated through exposure to a magnetic field are described. Such switches include conductive portions that are electrically separate from one another when in an open switch configuration. A mobile element of a switch includes one or more anchoring members that are in electrical contact with one of the conductive portions. The mobile element also has a beam that is attached to the one or more anchoring members. The beam can be attached to the one or more anchoring members by flexures. In some cases, the beam includes a plurality of strips. The beam has an end portion that is configured to move toward the other conductive portion when exposed to an external force, such as a magnetic field. When the mobile element electrically contacts the other conductive portion of the substrate, an electrical pathway is established between the conductive portions, giving rise to a closed switch configuration. Various configurations of anchoring members may significantly decrease initial upward beam deformation upon manufacture of the mobile element, resulting in an increased sensitivity upon exposure to a magnetic field. Methods for manufacturing switches that exhibit increased sensitivity to magnetic fields are also disclosed. Switches described can be formed using semiconductor manufacturing techniques. Methods described also include forming a beam that is attached to one or more anchoring members where an end portion of the beam moves in a substantially downward direction upon exposure to a magnetic field of sufficient intensity.
    • 描述通过暴露于磁场而被致动的开关。 这种开关包括当处于开路开关配置时彼此电分离的导电部分。 开关的移动元件包括与导电部分之一电接触的一个或多个锚定构件。 移动元件还具有附接到一个或多个锚固构件的梁。 梁可以通过弯曲连接到一个或多个锚固构件。 在一些情况下,梁包括多个条。 梁具有端部,其被配置为当暴露于诸如磁场的外力时朝向另一导电部分移动。 当移动元件电接触衬底的另一导电部分时,在导电部分之间建立电路径,产生闭合的开关构造。 锚定构件的各种构造可以在制造移动元件时显着降低初始向上的梁变形,导致暴露于磁场时的灵敏度增加。 还公开了对磁场具有增强的灵敏度的开关的制造方法。 所描述的开关可以使用半导体制造技术形成。 所描述的方法还包括形成连接到一个或多个锚固构件的梁,其中梁的端部在暴露于足够强度的磁场时沿基本上向下的方向移动。
    • 44. 发明授权
    • Floating point square root and reciprocal square root computation unit in a processor
    • 处理器中的浮点平方根和倒数平方根计算单元
    • US06349319B1
    • 2002-02-19
    • US09240765
    • 1999-01-29
    • Ravi ShankarSubramania I. Sudharsanan
    • Ravi ShankarSubramania I. Sudharsanan
    • G06F7552
    • G06F9/30014G06F7/5525G06F2207/5521
    • A method of computing a square root or a reciprocal square root of a number in a computing device uses a piece-wise quadratic approximation of the number. The square root computation uses the piece-wise quadratic approximation in the form: squareroot(X)={overscore (A)}ix2+{overscore (B)}ix+{overscore (C)}i, in each interval i. The reciprocal square root computation uses the piece-wise quadratic approximation in the form: 1/squareroot(X)=Aix2+Bix+Ci, in each interval i. The coefficients {overscore (A)}i, {overscore (B)}i, and {overscore (C)}i, and Ai, Bi, and Ci are derived for the square root operation and for the reciprocal square root operation to reduce the least mean square error using a least squares approximation of a plurality of equally-spaced points within an interval. In one embodiment, 256 equally-spaced intervals are defined to represent the 23 bits of the mantissa. The coefficients are stored in a storage and accessed during execution of the square root or reciprocal square root computation instruction.
    • 在计算装置中计算数字的平方根或倒数平方根的方法使用数字的分段二次近似。 平方根计算使用分段二次近似形式:在每个间隔i。 互逆平方根计算使用分段二次逼近形式:在每个间隔i。 导出了平方根运算和倒数平方根运算的系数{overscore(A)} i,{overscore(B)} i和{overscore(C)} i以及Ai,Bi和Ci 使用在间隔内的多个等间隔点的最小平方近似的最小均方误差。 在一个实施例中,256个等间隔的间隔被定义为表示尾数的23位。 系数存储在存储器中,并在执行平方根或倒数平方根计算指令期间访问。
    • 45. 发明授权
    • Combined multiplier/shifter and method therefor
    • 组合乘法器/移位器及其方法
    • US5436860A
    • 1995-07-25
    • US249519
    • 1994-05-26
    • Ravi ShankarAna S. LeonKin K. Chau-Lee
    • Ravi ShankarAna S. LeonKin K. Chau-Lee
    • G06F7/53G06F5/01G06F7/52G06F7/533G06F7/57G06F7/00
    • G06F7/5338G06F5/015G06F7/57
    • A combined multiplier/shifter (150) uses an existing high-speed multiplier to perform both multiplies and programmable left and right shifts without a dedicated high-speed shifter. A shift decoder (160) used in a shift mode provides first recoded signals according to a shift count and a shift direction. A recoder (161) recodes a multiplier input in a multiply mode to provide second recoded signals. A multiplier array (163) receives either a multiplicand or a shift operand at its multiplicand input, and uses either the first or second recoded signals selectively according to the mode. An output of the multiplier array (163) is either a product in the multiply mode or a first shift result in the shift mode. An output shifter (157) selectively adjusts the first shift result according to the shift direction to provide a second, final shift result.
    • 组合的乘法器/移位器(150)使用现有的高速乘法器来执行乘法和可编程的左右移位,而不需要专用的高速移位器。 在移位模式中使用的移位解码器(160)根据移位计数和移位方向提供第一重新编码的信号。 重新编码器(161)以乘法模式重新编码乘法器输入以提供第二重新编码的信号。 乘法器阵列(163)在其被乘数输入处接收被乘数或移位操作数,并且根据该模式选择性地使用第一或第二重新编码的信号。 乘法器阵列(163)的输出是乘法模式中的乘积或移位模式的第一移位。 输出移位器(157)根据移位方向选择性地调整第一移位结果以提供第二最终移位结果。