PLL and method for providing a single/multiple adjustable frequency range
    1.
    发明申请
    PLL and method for providing a single/multiple adjustable frequency range 有权
    PLL和提供单/多个可调频率范围的方法

    公开(公告)号:US20050237117A1

    公开(公告)日:2005-10-27

    申请号:US10828667

    申请日:2004-04-21

    摘要: A PLL circuit and method provides an adjustable operating frequency range by using at least two VCOs. In an embodiment of the present invention, circuit components of a PLL are adjusted in order to obtain a selected frequency range. In particular, a gain of a charge pump and resistance of a filter is adjusted responsive to a control signal. In alternate embodiments of the present invention, a voltage regulator, including an operational amplifier, is coupled to the output of the filter and the respective inputs of two VCOs. An output multiplexer then selects a VCO output responsive to the control signal. In another embodiment of the present invention, a multiplexer is coupled to the output of the voltage regulator to select which VCO receives a buffered voltage. In another embodiment of the present invention, respective operational amplifiers that may be enabled or disabled responsive to the control signal are coupled to a filter output and respective VCO inputs in order to provide an adjustable frequency range.

    摘要翻译: PLL电路和方法通过使用至少两个VCO提供可调节的工作频率范围。 在本发明的一个实施例中,调整PLL的电路部件以获得选定的频率范围。 特别地,响应于控制信号调整电荷泵的增益和滤波器的电阻。 在本发明的替代实施例中,包括运算放大器的电压调节器耦合到滤波器的输出端和两个VCO的相应输入端。 然后,输出多路复用器响应于控制信号选择VCO输出。 在本发明的另一个实施例中,多路复用器耦合到电压调节器的输出以选择哪个VCO接收缓冲电压。 在本发明的另一个实施例中,可以响应于控制信号使能或禁用的各个运算放大器被耦合到滤波器输出和相应的VCO输入,以便提供可调节的频率范围。

    PVT-compensated clock distribution
    8.
    发明授权
    PVT-compensated clock distribution 有权
    PVT补偿时钟分配

    公开(公告)号:US07095265B2

    公开(公告)日:2006-08-22

    申请号:US11101958

    申请日:2005-04-08

    IPC分类号: G06F1/04

    摘要: Described are methods and systems for distributing low-skew, predictably timed clock signals. A clock distribution network includes a plurality of dynamically adjustable clock buffers. A control circuit connected to each clock buffer controls the delays through the clock buffers in response to process, voltage, and temperature variations, and consequently maintains a relatively constant signal-propagation delay through the network. In one embodiment, each clock buffer includes skew-offset circuitry that adds to or subtracts from the PVT compensated delay values provided by the PVT control circuit to simplify clock skew minimization.

    摘要翻译: 描述了用于分配低偏移,可预测的定时时钟信号的方法和系统。 时钟分配网络包括多个可动态调整的时钟缓冲器。 连接到每个时钟缓冲器的控制电路响应于过程,电压和温度变化来控制通过时钟缓冲器的延迟,并且因此通过网络维持相对恒定的信号传播延迟。 在一个实施例中,每个时钟缓冲器包括倾斜偏移电路,其增加或减去由PVT控制电路提供的PVT补偿延迟值,以简化时钟偏差最小化。

    Push-pull output driver
    9.
    发明授权
    Push-pull output driver 失效
    推挽输出驱动

    公开(公告)号:US07015721B2

    公开(公告)日:2006-03-21

    申请号:US10925544

    申请日:2004-08-24

    IPC分类号: H03K19/0175

    摘要: An improved, open-loop push-pull driver is described. Closed-loop feedback loop techniques for control of the push-pull driver are described. These techniques are particularly well adapted to control shoot-through current in a push-pull driver circuit.

    摘要翻译: 描述了改进的开环推挽式驱动器。 描述了用于控制推挽驱动器的闭环反馈回路技术。 这些技术特别适用于控制推挽式驱动电路中的直通电流。

    Apparatus and method for level-shifting input receiver circuit from high external voltage to low internal supply voltage
    10.
    发明授权
    Apparatus and method for level-shifting input receiver circuit from high external voltage to low internal supply voltage 有权
    输入接收电路从高外部电压到低内部电源电压的装置和方法

    公开(公告)号:US06600338B1

    公开(公告)日:2003-07-29

    申请号:US09849755

    申请日:2001-05-04

    IPC分类号: H03K190175

    CPC分类号: H03K19/018528

    摘要: A circuit and method for level-shifting an input signal are disclosed that provide for level-shifting of a the input signal where an external voltage level is greater than an internal voltage of the signal. In the present invention, the input signal is compared to a reference signal to produce a differential current signal reflecting the logic level of the input signal. The differential current signal is reflected through a pair of current mirrors operating from the external voltage level to drive a pair of resistive loads. Each of the resistive loads is coupled in series with a current sink between the internal supply voltage and a ground voltage. As a result, the input signal may be received and level-shifted with gain even when the internal supply voltage is less than twice a transistor threshold voltage without introducing significant distortion to the received signal.

    摘要翻译: 公开了用于电平移位输入信号的电路和方法,其提供输入信号的电平移位,其中外部电压电平大于信号的内部电压。 在本发明中,将输入信号与参考信号进行比较,以产生反映输入信号的逻辑电平的差分电流信号。 差分电流信号通过从外部电压电平工作的一对电流镜反射,以驱动一对电阻负载。 每个电阻负载与内部电源电压和接地电压之间的电流吸收器串联耦合。 结果,即使当内部电源电压小于晶体管阈值电压的两倍时,也可以接收输入信号并进行电平移位,而不会对接收到的信号引入显着的失真。