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    • 2. 发明授权
    • 4-2 compressor circuit and voltage holding circuit for use in 4-2 compressor circuit
    • 4-2压缩机电路和电压保持电路用于4-2压缩机电路
    • US06308195B1
    • 2001-10-23
    • US09248284
    • 1999-02-11
    • Yuko HiraseKatsunori Sawai
    • Yuko HiraseKatsunori Sawai
    • G06F750
    • G06F7/5338G06F7/607
    • A 4-2 compressor circuit calculates the sum of first through fourth inputs and a carry input applied thereto and for furnishing the summation result and first and second carries generated during the calculation of the summation. An input value converting unit inverts the third and fourth inputs only if the third input is logic 0 and the fourth input is logic 1. A summation unit calculates the logical exclusive OR of any two of the first through fourth inputs and the carry input applied to the 4-2 compressor circuit, the logical exclusive OR of any two of the first logical exclusive OR and the remaining three inputs, the logical exclusive OR of any two of the second logical exclusive OR and the remainder, and the logical exclusive OR of the third logical exclusive OR and the remainder. The summation unit then furnishes the fourth logical exclusive OR as the summation result. A carry calculating unit calculates the first carry from the first, third, and fourth inputs. A selecting unit selects either the carry input or the second input according to the logical exclusive OR of the logical exclusive OR of any two of the first through fourth inputs and the logical exclusive OR of the remainder, and then furnishes the selected one as the second carry.
    • 4-2压缩机电路计算第一至第四输入和应用于其的进位输入的和,并且用于提供求和结果和在求和的计算期间产生的第一和第二输入。 输入值转换单元仅在第三输入为逻辑0且第四输入为逻辑1时反转第三和第四输入。求和单元计算第一至第四输入中的任何两个的逻辑异或或应用于 4-2压缩器电路,第一逻辑异或和其余三个输入中的任何两个的逻辑异或,第二逻辑异或和余数中的任何两个的逻辑异或,以及逻辑异或 第三个逻辑异或OR和其余。 求和单元然后提供第四逻辑异或作为求和结果。 进位计算单元从第一,第三和第四输入端计算第一进位。 选择单元根据第一至第四输入中的任意两个的逻辑异或与余数的逻辑异或逻辑异或运算来选择进位输入或第二输入,然后将所选择的逻辑异或 携带。
    • 6. 发明授权
    • Clock generator and clock generating method capable of varying clock
frequency without increasing the number of delay elements
    • 时钟发生器和时钟产生方法能够改变时钟频率而不增加延迟元件的数量
    • US6049238A
    • 2000-04-11
    • US178580
    • 1998-10-26
    • Kazuyoshi ShimizuKouichi IshimiKatsunori Sawai
    • Kazuyoshi ShimizuKouichi IshimiKatsunori Sawai
    • H03K3/027H03K3/86H03L7/06H03L7/08H03L7/181
    • H03K3/027H03K3/86H03L7/06H03L7/08H03L7/181
    • A clock generator including a frequency multiplier, a phase lock circuit and a frequency divider. The frequency multiplier generates a frequency multiplied clock by multiplying the frequency of an input clock. The phase lock circuit detects a phase difference between the input clock and a frequency divided clock, and generates, by delaying the frequency multiplied clock by an amount corresponding to the phase difference, a phase-locked clock with its phase locked with the input clock. The frequency divider detects in every fixed cycle a particular pulse of the phase-locked clock, and generates the frequency divided clock by dividing the phase-locked clock with reference to the particular pulse of the phase-locked clock. In particular, the frequency divider detects the particular pulse immediately previous to a falling edge of the input clock. This can reduce the phase difference between the input clock and the phase-locked clock, and hence to solve a problem of a conventional clock generator in that a delay time of a digital delay line in a phase lock circuit must be lengthened with a reduction in the multiplication number of the frequency multiplied clock, which requires a greater number of delay elements because of a large occupying area of the delay elements and a decoder, thereby increasing the circuit scale and cost of a chip to reduce the multiplication number of the frequency multiplied clock.
    • 包括倍频器,锁相电路和分频器的时钟发生器。 倍频器通过乘以输入时钟的频率来产生倍频时钟。 锁相电路检测输入时钟和分频时钟之间的相位差,并通过将倍频时钟延迟与相位差对应的量来产生锁相时钟,其锁相与输入时钟相锁相。 分频器在每个固定周期内检测锁相时钟的特定脉冲,并通过相对于锁相时钟的特定脉冲对相位锁定时钟进行分频来产生分频时钟。 特别地,分频器检测紧接在输入时钟下降沿之前的特定脉冲。 这可以减小输入时钟和锁相时钟之间的相位差,因此解决传统的时钟发生器的问题在于,锁相电路中的数字延迟线的延迟时间必须延长,同时减少 频率倍增时钟的倍数,由于延迟元件的占用面积大,解码器需要较大数量的延迟元件,从而增加了芯片的电路规模和成本,从而减少倍频的倍数 时钟。