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    • 4. 发明申请
    • EXPONENTIATION CIRCUIT UTILIZING SHIFT MEANS AND METHOD OF USING SAME
    • 使用移位手段的授权电路及其使用方法
    • WO1996028774A1
    • 1996-09-19
    • PCT/US1996000955
    • 1996-01-29
    • MOTOROLA INC.BUSS, John, MichaelDWORKIN, JamesLLOYD, Scott, EdwardPAN, Shao, WeiSMITH, Stephen, L.WANG, Shay-Ping, Thomas
    • MOTOROLA INC.
    • G06F01/02
    • G06F7/556
    • A circuit and method for computing an exponential signal x is provided. The circuit includes a logarithm converter (4) which converts an input signal to binary word that represents the logarithm of an input signal x. A first shift register shifts (8) the binary word in a bit-wise fashion to produce a first intermediate value; while a second shift register (28) shifts the binary word in a bit-wise fashion to produce a second intermediate value. The shift registers may be implemented using multiplexers. The shifting operations are equivalent to multiplying the intermediate values by a factor which is a power of two. The first intermediate value is either added to or subtracted from the second intermediate value to produce a combined value. An inverse-logarithm converter (34) converts the combined value to the exponential signal.
    • 提供了一种用于计算指数信号x 的电路和方法。 电路包括将输入信号转换为表示输入信号x的对数的二进制字的对数转换器(4)。 第一移位寄存器以逐位方式移位(8)二进制字以产生第一中间值; 而第二移位寄存器(28)以逐位方式移位二进制字以产生第二中间值。 移位寄存器可以使用多路复用器来实现。 换档操作等效于将中间值乘以2的幂。 将第一中间值添加到第二中间值或从第二中间值中减去以产生组合值。 逆对数转换器(34)将组合值转换为指数信号。