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1. 发明授权

US07017070B1 Apparatus for synchronization of double data rate signaling 有权
标题翻译：双数据速率信令同步的装置
公开(公告)号：US07017070B1
公开(公告)日：2006-03-21
申请号：US09687858
申请日：2000-10-13
申请人： Chak Cheung Edward Ho , Oleg Drapkin , Carl Mizuyabu , Ray Chau , Gordon Caruk
发明人： Chak Cheung Edward Ho , Oleg Drapkin , Carl Mizuyabu , Ray Chau , Gordon Caruk
IPC分类号： G06F1/12 , G06F1/04
CPC分类号： G06F13/4243 , G11C7/1066 , G11C7/22 , G11C7/222
摘要： A signal phase shifting circuit shifts the phase of an input signal, such as a STROBE signal, based on a reference signal, such as a CLOCK signal, to facilitate, for example, receiving of double data rate data. The signal phase shifting circuit includes a reference signal period dividing circuit having a feedback delay matching array operatively coupled to one of a plurality of voltage control delay lines. This signal phase shifting circuit also includes a variable delay circuit that provides a phase shifted output signal, such as a phase shifted STROBE signal, that includes a delay stage in a phase shifted output signal drive buffer coupled to the delay stage, such as a voltage control delay line. The feedback delay matching array includes a plurality of serially coupled buffer stages operatively coupled to compensate for delay variations associated with the phase shifted output signal drive buffer in the variable delay circuit.
摘要翻译：信号移相电路基于诸如CLOCK信号的参考信号来移动诸如STROBE信号的输入信号的相位，以便于例如接收双倍数据速率数据。信号移相电路包括具有可操作地耦合到多个电压控制延迟线之一的反馈延迟匹配阵列的参考信号周期分频电路。该信号移相电路还包括可变延迟电路，其提供相移输出信号，例如相移的STROBE信号，该相移输出信号包括耦合到延迟级的相移输出信号驱动缓冲器中的延迟级，例如电压控制延时线。反馈延迟匹配阵列包括可操作地耦合以补偿与可变延迟电路中的相移输出信号驱动缓冲器相关联的延迟变化的多个串联耦合缓冲器级。

2. 发明授权

US06194971B1 Method and apparatus for phase shifting a controlled oscillator and applications thereof 失效
标题翻译：用于移相受控振荡器的方法和装置及其应用
公开(公告)号：US06194971B1
公开(公告)日：2001-02-27
申请号：US08840568
申请日：1997-04-21
申请人： David Ian James Glen , Hugh Hin-Poon Chow , Ray Chau , Philip Lawrence Swan
发明人： David Ian James Glen , Hugh Hin-Poon Chow , Ray Chau , Philip Lawrence Swan
IPC分类号： H03B2700
CPC分类号： H03L7/1974 , H03B27/00 , H03L7/081 , H03L7/0996 , H03L7/18
摘要： A method and apparatus for providing very small changes in the output oscillation of a controlled oscillation circuit, which may be used in a phase locked loop circuit, is accomplished by a phase-shifting controlled oscillator that includes an oscillation circuit and a selection circuit. The oscillation circuit generates a plurality of oscillations that are of approximately the same frequency and are approximately equally phase shifted from one another. The selection circuit is operably coupled to receive the plurality of oscillations and selects one of them to be the output oscillation based on a control signal. The very small change in the output oscillation occurs when the selection circuit, based on the control signal, selects another one of the oscillations to be the output oscillation. When the change happens, a single pulse is stretched by the phase difference between the “old” output oscillation and the “new” output oscillation.
摘要翻译：用于在可锁定环路电路中使用的受控振荡电路的输出振荡提供极小变化的方法和装置由包含振荡电路和选择电路的相移控制振荡器来实现。振荡电路产生大致相同频率并且彼此大致相等移位的多个振荡。选择电路可操作地耦合以接收多个振荡，并且基于控制信号选择它们中的一个作为输出振荡。当选择电路基于控制信号选择另一个振荡作为输出振荡时，产生非常小的输出振荡变化。当发生变化时，单个脉冲被“旧”输出振荡和“新”输出振荡之间的相位差拉伸。

3. 发明授权

US5959601A Method and apparatus for parallel in serial out transmission 失效
标题翻译：并行串行传输的方法和装置
公开(公告)号：US5959601A
公开(公告)日：1999-09-28
申请号：US820291
申请日：1997-03-18
申请人： Chak Cheung Ho , Hugh Hin-Poon Chow , Ray Chau
发明人： Chak Cheung Ho , Hugh Hin-Poon Chow , Ray Chau
IPC分类号： G06F3/147 , G09G3/36 , H03K19/003 , H03K19/0185
CPC分类号： G09G3/3611 , G06F3/147 , H03K19/00315 , H03K19/00361 , H03K19/018521
摘要： A method and apparatus for providing serial transmission of a parallel input is accomplished by a parallel input serial output transmitter that includes a shift register operably coupled to receive a parallel input and to provide data serially to a gating circuit. The gating circuit, based on the state of the data it receives, generates a drive signal which causes a switching circuit to route current from a first current source to a second current source over different paths to produce a serial output. A bias circuit is coupled to the switching circuit to bias the serial output to a desired level.
摘要翻译：用于提供并行输入的串行传输的方法和装置由并行输入串行输出发射器实现，该并行输入串行输出发射器包括可操作地耦合以接收并行输入并且向选通电路串行地提供数据的移位寄存器。门控电路基于其接收的数据的状态产生驱动信号，该驱动信号使切换电路将电流从不同路径上的第一电流源路由到第二电流源，以产生串行输出。偏置电路耦合到开关电路以将串行输出偏置到期望的电平。

4. 发明授权

US5815042A Duty cycled control implemented within a frequency synthesizer 失效
标题翻译：在频率合成器内执行的负载循环控制
公开(公告)号：US5815042A
公开(公告)日：1998-09-29
申请号：US634399
申请日：1996-04-18
申请人： Hugh Chow , David Glen , Ray Chau
发明人： Hugh Chow , David Glen , Ray Chau
IPC分类号： H03B1/00 , H03L7/16
CPC分类号： H03K5/1565
摘要： A programmable frequency synthesizer comprised of a phase locked loop (PLL) including a current controlled oscillator (ICO), a level translator for receiving output signals from the ICO wherein the output signals have a finite slew rate, a reference source of signals, a phase-frequency detector for receiving signals from the reference source and output signals generated by the level translator and for providing pulse signals to the ICO having pulse widths which are directly proportional to phase difference between the signals from the reference source and the output signals from the level translator, and apparatus for varying the slew rate of the output signals from the ICO wherein the duty cycle and thus the frequency of output signals of the level translator may be varied.
摘要翻译：一种可编程频率合成器，包括一个包括电流控制振荡器（ICO）的锁相环（PLL），用于接收来自ICO的输出信号的电平转换器，其中输出信号具有有限的转换速率，参考信号源，相位频率检测器，用于从参考源接收信号和由电平转换器产生的输出信号，并向ICO提供脉冲信号，脉冲宽度与来自参考源的信号与来自电平的输出信号之间的相位差成正比。转换器和装置，用于改变来自ICO的输出信号的转换速率，其中电平转换器的占空比和输出信号的频率可以变化。

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