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    • 6. 发明授权
    • Predriver logic circuit
    • 前驱逻辑电路
    • US6043682A
    • 2000-03-28
    • US997223
    • 1997-12-23
    • Sanjay DabralDilip K. SampathAlper Ilkbahar
    • Sanjay DabralDilip K. SampathAlper Ilkbahar
    • H03K19/003H03K19/0175H03K19/094
    • H03K19/00361
    • A buffer for enabling a signal to be applied to a bus. The buffer includes a first transistor coupled to a bus and a voltage supply. The logic buffer includes a first logic circuit which has an input coupled to receive a data signal and adapted to charge a terminal of the transistor at a first rate in response to a transition in the data signal. A second logic circuit charges the terminal at a faster rate during an initial transition period, until a first preselected condition is met. The buffer also includes a third logic circuit to charge the terminal at a second faster rate during a final transition period, after a second preselected condition is met. A method for controlling a voltage level of a signal applied to a terminal of a transistor includes charging the terminal at a fast rate until a first preselected condition is met. The terminal is then charged at a slower rate, until a second preselected condition is met, at which time the terminal is charged at a second fast rate, which is also greater than the slower rate.
    • 用于使信号施加到总线的缓冲器。 缓冲器包括耦合到总线的第一晶体管和电压源。 逻辑缓冲器包括第一逻辑电路,其具有耦合以接收数据信号的输入,并且适于响应于数据信号中的转变以第一速率对晶体管的端子充电。 第二逻辑电路在初始过渡期间以更快的速率对终端充电,直到满足第一预选条件。 缓冲器还包括第三逻辑电路,以在满足第二预选条件之后,在最后的过渡期期间以更快的速率对终端充电。 用于控制施加到晶体管的端子的信号的电压电平的方法包括以快速的速率对端子充电直到满足第一预选条件。 然后以较慢的速率对终端进行充电,直到满足第二预选条件,此时终端以第二快速率充电,其也大于较慢速率。
    • 8. 发明授权
    • Method and apparatus for slew rate and impedance compensating buffer
circuits
    • 压摆率和阻抗补偿缓冲电路的方法和装置
    • US5898321A
    • 1999-04-27
    • US824066
    • 1997-03-24
    • Alper IlkbaharBendik Kleveland
    • Alper IlkbaharBendik Kleveland
    • H03K17/16H03K19/0185
    • H03K17/164
    • A method and an apparatus for adjusting the slew rate and impedance of a buffer in an integrated circuitry. In one embodiment, an integrated circuit buffer includes a pre-driver circuit, which includes a slew rate compensation circuit, coupled to a driver circuit, which includes an impedance compensation circuit. The slew rate compensation circuit includes parallel connected p-channel transistors to power and parallel connected n-channel transistors to ground to provide a variable resistance to virtual rails for inverter circuits that are included in the pre-driver circuit. The slew rate compensation circuit is digitally controlled with slew rate control signals. The impedance compensation circuit includes parallel connected p-channel transistors to power and parallel connected n-channel transistors to ground from an output node of the buffer. The parallel connected transistors of the impedance compensation circuit are digitally controlled with impedance control signals. The resistance to power and ground from the respective rails of the pre-driver circuit are controlled with the slew rate control signals to adjust the slew rate of data signals being driven by the buffer. The rails are shared among the inverters of the driver circuit to reduce the number of devices used by the buffer, thereby reducing the amount of circuit area and power used by the buffer.
    • 一种用于调整集成电路中的缓冲器的转换速率和阻抗的方法和装置。 在一个实施例中,集成电路缓冲器包括预驱动器电路,其包括耦合到驱动器电路的压摆率补偿电路,该驱动器电路包括阻抗补偿电路。 转换速率补偿电路包括并联的p沟道晶体管,以将并联的n沟道晶体管接地,为包括在预驱动器电路中的反相器电路提供可变电阻。 转换速率补偿电路用压摆率控制信号进行数字控制。 阻抗补偿电路包括并联的p沟道晶体管,以将缓冲器的输出节点的N沟道晶体管并联连接到地。 阻抗补偿电路的并联晶体管通过阻抗控制信号进行数字控制。 通过转换速率控制信号控制来自预驱动器电路的相应导轨的电源和接地电阻,以调整由缓冲器驱动的数据信号的转换速率。 轨道在驱动器电路的反相器之间共享,以减少缓冲器使用的设备数量,从而减少缓冲器所使用的电路面积和功率。
    • 9. 发明授权
    • Method and apparatus for buffer self-test and characterization
    • 用于缓冲区自检和表征的方法和装置
    • US5621739A
    • 1997-04-15
    • US643954
    • 1996-05-07
    • Christopher J. SineAlper IlkbaharTak M. Mak
    • Christopher J. SineAlper IlkbaharTak M. Mak
    • G01R31/30G01R31/317G01R31/3185G01R31/28
    • G01R31/31716G01R31/30G01R31/318577
    • A self-testing buffer circuit. The buffer circuit utilizes an adjustable delay circuit to test whether the buffer can capture a data value during a variable stroke window. The buffer includes an input circuit coupled to receive a data value generated by the self-testing buffer circuit. The buffer circuit also includes a latch which has a latch input coupled to receive the data value from the input circuit. An adjustable delay circuit having a delay adjust input is coupled to provide an adjustably delayed strobe to a clock input of the latch. A comparison circuit may be coupled to compare a latch output value to an expected value. The self-testing buffer circuit may be used in conjunction with serial or parallel test resisters to test the buffer performance for a variety of strobe delays and data values.
    • 自检缓冲电路。 缓冲电路利用可调延迟电路来测试缓冲器是否可以在可变行程窗口期间捕获数据值。 缓冲器包括耦合以接收由自测试缓冲器电路产生的数据值的输入电路。 缓冲电路还包括锁存器,其具有耦合以从输入电路接收数据值的锁存器输入。 具有延迟调整输入的可调延迟电路被耦合以向锁存器的时钟输入提供可调节延迟的选通。 可以将比较电路耦合以将锁存器输出值与预期值进行比较。 自测试缓冲电路可以与串行或并行测试电阻一起使用,以测试各种选通延迟和数据值的缓冲器性能。