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    • 3. 发明申请
    • TWO-STAGE MULLER C-ELEMENT
    • 两阶段MULLER C-ELEMENT
    • WO0122591A9
    • 2002-11-14
    • PCT/US0026379
    • 2000-09-25
    • SUN MICROSYSTEMS INCFAIRBANKS SCOTT M
    • FAIRBANKS SCOTT M
    • G06F9/38H03K19/20H03K19/177G06F1/10G06F11/20G11C5/00H03K19/003H03K19/08
    • H03K19/20G06F9/3869
    • A Muller C-element comprises two stages. The first stage consists of a NAND and a NOR gate, each driven by all of the inputs to the Muller C-element. In the second stage, the outputs of the two gates are used separately to switch on and off two output transistors, which drive the output of the Muller C-element. A keeper flip flop serves to retain the output value between changes. Because current from each gate is applied only to one output transistor, delay is reduced. Furthermore, an unneeded output transistor is switched off as soon as logically possible, often during the otherwise unused interval while the input values differ, which reduces both delay and crossover current. In a preferred embodiment, the NAND and NOR gates each comprise a set of series transistors and a set of parallel transistors. The parallel transistors in these gates work together to change the output value when all inputs are changing simultaneously, thereby allowing the use of parallel transistors having widths narrower than those normally employed in NAND and NOR gates. Use of smaller transistors renders the inputs easier to drive, improving the speed of the circuit.
    • Muller C元素包括两个阶段。 第一级由NAND和NOR门组成,每一个都由Muller C元素的所有输入驱动。 在第二级中,两个门的输出分别用于接通和关断驱动Muller C元件输出的两个输出晶体管。 保持器触发器用于保持更改之间的输出值。 因为来自每个栅极的电流仅施加到一个输出晶体管,所以延迟减小。 此外,不需要的输出晶体管一经逻辑地切断,通常在另外未使用的间隔期间,而输入值不同,这减少了延迟和交叉电流。 在优选实施例中,NAND和NOR门各自包括一组串联晶体管和一组并联晶体管。 当所有输入同时变化时,这些门中的并联晶体管一起工作以改变输出值,从而允许使用宽度窄于NAND和NOR门中通常采用的宽度的并行晶体管。 使用更小的晶体管使输入更容易驱动,提高电路的速度。