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    • 27. 发明授权
    • Self-adjusting variable drive strength buffer circuit and method for
controlling the drive strength of a buffer circuit
    • 自调节可变驱动强度缓冲电路及控制缓冲电路驱动强度的方法
    • US5444406A
    • 1995-08-22
    • US14955
    • 1993-02-08
    • Stephen C. Horne
    • Stephen C. Horne
    • G06F1/04G11C11/407H03K5/13H03K19/003H03K19/0175H03K19/0185
    • H03K19/018585H03K19/00384H03K5/131
    • A variable drive strength buffer circuit is provided that automatically adjusts its associated drive strength to compensate for variations in manufacturing parameters, environmental conditions and operating conditions. As a result, electromagnetic interference, power supply noise, edge rates and ringing may be reduced. The self-adjusting variable drive buffer circuit may be fabricated on an integrated circuit and includes a speed detector unit that measures the relative speed of the integrated circuit. In one embodiment, a self-adjusting variable drive strength buffer circuit includes a circuit speed detector unit having a delay chain consisting of a plurality of variable delay elements. When the delay chain length is matched to the period of an input clock, the length of the chain is an accurate measure of the relative "speed" of the transistors making up the delay chain and therefore of the other transistors on the integrated circuit chip. The length of the delay chain is encoded into a vector (one or more digital bits of information) that controls the amount of drive that is provided in the variable drive buffer circuit. More drive is provided if the transistors on the chip are relatively slow and less drive is provided if the transistors are relatively fast.
    • 提供了可变驱动强度缓冲电路,其自动调整其相关联的驱动强度以补偿制造参数,环境条件和操作条件的变化。 因此,可能会降低电磁干扰,电源噪声,边沿速率和振铃。 自调节可变驱动缓冲电路可以在集成电路上制造,并且包括测量集成电路的相对速度的速度检测器单元。 在一个实施例中,自调节可变驱动强度缓冲电路包括具有由多个可变延迟元件组成的延迟链的电路速度检测器单元。 当延迟链长度与输入时钟的周期匹配时,链的长度是组成延迟链的晶体管和集成电路芯片上的其他晶体管的相对“速度”的精确测量。 延迟链的长度被编码为控制可变驱动缓冲电路中提供的驱动量的向量(一个或多个数字信息位)。 如果芯片上的晶体管相对较慢,则提供更多的驱动,如果晶体管相对较快,则提供较少的驱动。
    • 30. 发明授权
    • Method and apparatus for logic synchronization
    • 用于逻辑同步的方法和装置
    • US06268746B1
    • 2001-07-31
    • US09586638
    • 2000-06-05
    • Terence M. PotterJames S. BlomgrenAnthony M. PetroStephen C. Horne
    • Terence M. PotterJames S. BlomgrenAnthony M. PetroStephen C. Horne
    • H03K19096
    • G06F7/026G06F1/08G06F5/015G06F7/02G06F7/483G06F7/49G06F7/508G06F7/5443G06F17/5045G06F2207/3824G11C7/1006G11C8/00G11C8/10G11C8/16G11C8/18G11C11/418G11C11/419G11C11/56G11C19/00H03K19/0002H03K19/00346H03K19/00361H03K19/00384H03K19/0813H03K19/096H03K19/0963H03K19/215
    • The present invention is a method and apparatus that synchronizes logic in an integrated circuit (IC). The present invention discloses a global clock signal with a global phase and an approximately 50% duty cycle. Additionally, the present invention discloses a first local clock signal with a first phase and an approximately 50% duty cycle that couples to a first dynamic logic gate where the first local clock signal is generated from the global clock signal. One or more intermediate local clock signals with one or more intermediate phases are generated from the global clock signal where each intermediate local clock signal has an approximately 50% duty cycle that couples to one or more intermediate dynamic logic gates. An end local clock signal with an end phase and an approximately 50% dutycycle that is also generated from the global clock signal and that couples to an end dynamic logic gate. The phase of an individual local clock signal overlaps an earlier phase local clock signal by an amount approximately equal to the overlap of the phase of the next individual local clock signal. The first dynamic logic gate, the intermediate dynamic logic gate(s), and the last dynamic logic gates couple such that an individual dynamic logic gate with an individual local clock signal and phase may only provide a signal to the next individual dynamic logic gate that uses a next phase local clock signal where the gates may couple together in series, in a feed back loop, or a feed forward loop.
    • 本发明是一种使集成电路(IC)中的逻辑同步的方法和装置。 本发明公开了具有全局相位和约50%占空比的全局时钟信号。 此外,本发明公开了具有第一相位和约50%占空比的第一本地时钟信号,其耦合到第一动态逻辑门,其中从全局时钟信号产生第一本地时钟信号。 从全局时钟信号产生具有一个或多个中间相位的一个或多个中间本地时钟信号,其中每个中间本地时钟信号具有耦合到一个或多个中间动态逻辑门的大约50%的占空比。 结束本地时钟信号,具有终止相位和大约50%的占空比,其也从全局时钟信号产生并且耦合到结束动态逻辑门。 单个本地时钟信号的相位与较早的相位本地时钟信号重叠大约等于下一个本地时钟信号的相位重叠的量。 第一动态逻辑门,中间动态逻辑门和最后的动态逻辑门耦合,使得具有单个本地时钟信号和相位的单个动态逻辑门只能向下一个单独的动态逻辑门提供信号, 使用下一个相位本地时钟信号,其中门可以串联耦合在一起,在反馈回路中或前馈回路中。