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    • 85. 发明公开
    • Clock control method, frequency dividing circuit and PLL circuit
    • Taktsteuerungsverfahren,Frequenzteilerschaltung und Phasenregelkreisschaltung
    • EP1293890A2
    • 2003-03-19
    • EP02019919.6
    • 2002-09-04
    • NEC CORPORATION
    • Saeki, Takanori
    • G06F7/68
    • H03L7/1976G06F7/68H03K2005/00065H03K2005/00071H03L7/081H03L7/0891H03L7/1974
    • A PLL circuit includes phase comparator (103) having a first input terminal to which a reference clock is applied; charge pump (104) generating a voltage conforming to a phase difference output from the phase comparator; loop filter (105); VCO (106); frequency dividing circuit (107), to which an output clock of the VCO is input, performing frequency-division by P; A counter (109) dividing the output of the frequency dividing circuit by a second value A; circuits (121,122) generating two signals, which have a phase difference equivalent to one period of the P-frequency-divided output of the frequency dividing circuit, whenever frequency-division by A is performed by the A counter; and interpolator (123), to which the two generated signals are input, producing an output signal of a phase obtained by interpolating the phase difference between the two signals in accordance with an interior division ratio set by a control signal.
    • PLL电路包括相位比较器(103),其具有施加了参考时钟的第一输入端; 电荷泵(104)产生符合从相位比较器输出的相位差的电压; 环路滤波器(105); VCO(106); 分频电路(107),输入VCO的输出时钟,进行P分频; 将分频电路的输出除以第二值A的计数器(109) 电路(121,122)产生两个信号,每当由A计数器执行A分频时,其具有相当于分频电路的P分频输出的一个周期的相位差; 和输入了两个生成信号的内插器(123),根据由控制信号设定的内部分频比,产生通过内插两个信号之间的相位差而获得的相位的输出信号。
    • 90. 发明公开
    • Temperature self-compensated time delay circuits
    • Temitaturkompensation(Zeitverzögerungsschaltungen)
    • EP0423963A2
    • 1991-04-24
    • EP90310649.0
    • 1990-09-28
    • ADVANCED MICRO DEVICES, INC.
    • Chen, Kou-Su
    • H03K5/13
    • H03K5/133H03K2005/00065H03K2005/00143H03K2005/00195
    • A constant time delay circuit which is insensitive to variations in temperature and has no D.C. power dis­sipation includes a temperature-insensitive reference current source (12) for dynamically charging and discharging a capacitive load (M5), a polysilicon resistor (16), and at least one time delay control circuit (14) to produce a constant time delay. In an alternate embodiment, there is provided a temperature self-compensated programmable delay circuit which includes electrically programmable resistor means (30) for adjusting the total resistance in a temperature-­insensitive reference current source (12b). As a result, the amount of the reference current is con­trolled so as to obtain a desired delay time.
    • 对温度变化不敏感并且没有直流功率耗散的恒定时间延迟电路包括用于动态地对容性负载(M5)充电和放电的温度不敏感参考电流源(12),多晶硅电阻器(16) 至少一个时间延迟控制电路(14)产生恒定的时间延迟。 在替代实施例中,提供了一种温度自补偿可编程延迟电路,其包括用于调节温度不敏感参考电流源(12b)中的总电阻的电可编程电阻器装置(30)。 结果,控制参考电流的量以获得期望的延迟时间。