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    • 71. 发明授权
    • Bus driver circuit including a slew rate indicator circuit having a one
shot circuit
    • 总线驱动器电路包括具有单触发电路的转换速率指示器电路
    • US5959481A
    • 1999-09-28
    • US801521
    • 1997-02-18
    • Kevin S. DonnellyChanh TranMichael ChingBruno Garlepp
    • Kevin S. DonnellyChanh TranMichael ChingBruno Garlepp
    • G06F13/40H03K5/12
    • G06F13/4072
    • A bus driver circuit having slew rate control. According to one embodiment, the bus driver circuit includes the following elements: a first circuit having an input configured to receive a data signal and an output operative to output a drive signal in response to the data signal; a second circuit coupled in parallel with the first circuit and operative to receive a slew rate control signal; and a slew rate indicator circuit coupled to the second circuit. The slew rate indicator circuit determines the state of the slew rate control signal in response to operating conditions that cause variations in the slew rate of the drive signal such that when the slew rate control signal is asserted, the second circuit is enabled to affect the slew rate of the drive signal. For one embodiment, the slew rate indicator includes a pulse generator circuit and a clocked comparator circuit. The pulse generator circuit is operative to receive a clock signal and generate a pulse in response to a first transition of the clock signal. The clocked comparator is coupled to the pulse generator circuit and operative to receive the pulse. The clocked comparator determines the state of the slew rate control signal by sampling for the pulse in response to a second transition of the clock signal.
    • 具有转换速率控制的总线驱动器电路。 根据一个实施例,总线驱动器电路包括以下元件:第一电路,其具有被配置为接收数据信号的输入和用于响应于数据信号输出驱动信号的输出; 第二电路,与第一电路并联并且可操作以接收压摆率控制信号; 以及耦合到第二电路的转换速率指示器电路。 压摆率指示电路响应于导致驱动信号的转换速率的变化的操作条件来确定转换速率控制信号的状态,使得当转换速率控制信号被确认时,第二电路能够影响转换 驱动信号的速率。 对于一个实施例,转换速率指示器包括脉冲发生器电路和时钟比较器电路。 脉冲发生器电路用于接收时钟信号并且响应于时钟信号的第一转换而产生脉冲。 时钟比较器耦合到脉冲发生器电路并且可操作以接收脉冲。 时钟比较器响应于时钟信号的第二次转换来确定脉冲采样的转换速率控制信号的状态。
    • 73. 发明授权
    • Voltage controlled phase shifter with unlimited range
    • 电压控制移相器,无限范围
    • US5554945A
    • 1996-09-10
    • US196582
    • 1994-02-15
    • Thomas H. LeeKevin S. DonnellyTsyr-Chyang Ho
    • Thomas H. LeeKevin S. DonnellyTsyr-Chyang Ho
    • H03H11/20H03K5/13
    • H03H11/20H03K2005/00286
    • A voltage-controlled phase shift apparatus having an unlimited range for producing an output signal that varies in phase from an input signal by a predetermined phase difference. The phase shift apparatus includes a first delay circuit coupled to receive the input signal, the first delay circuit for outputting a first intermediate signal that is .alpha. degrees out of phase with the input signal, a second intermediate signal that is .beta. degrees out of phase with the first intermediate signal, a third intermediate signal that is 180 degrees out of phase with the first intermediate signal, and a fourth intermediate signal that is 180 degrees out of phase with the second intermediate signal. The phase shift apparatus also includes a phase interpolator circuit coupled to receive a control voltage signal and the first, second, third and fourth intermediate signals, the phase interpolator for phase mixing a selected pair of the first, second, third and fourth intermediate signals in response to the control voltage signal, the phase interpolator for outputting the output signal. A phase selector circuit coupled to the phase interpolator circuit and coupled to receive a phase slope signal and the control voltage signal selects the selected pair in response to the phase slope signal and the control voltage signal such that the output signal varies in phase from the input signal by the predetermined phase difference.
    • 一种具有无限范围的电压控制相移装置,用于产生与输入信号相位相差预定相位差的输出信号。 相移装置包括耦合以接收输入信号的第一延迟电路,用于输出与输入信号异相异步的第一中间信号的第一延迟电路,与相位相差β度的第二中间信号, 第一中间信号,与第一中间信号相差180度的第三中间信号,以及与第二中间信号相差180度的第四中间信号。 相移装置还包括相位插值器电路,其耦合以接收控制电压信号和第一,第二,第三和第四中间信号,相位内插器,用于将所选择的一对第一,第二,第三和第四中间信号相互混合在 对控制电压信号的响应,用于输出输出信号的相位插值器。 相位选择器电路,耦合到所述相位内插器电路并被耦合以接收相位斜率信号,并且所述控制电压信号响应于所述相位斜率信号和所述控制电压信号选择所选择的对,使得所述输出信号与所述输入信号 信号预定的相位差。