公开(公告)号：US09503058B1

公开(公告)日：2016-11-22

申请号：US14629816

申请日：2015-02-24

Applicant: Xilinx, Inc.

Inventor： Ionut C. Cical ,  John K. Jennings ,  Edward Cullen

IPC: H03K3/011 ,  H03L7/00 ,  H03K3/0231 ,  G06F1/08

CPC classification number: G06F1/08 ,  G06F1/04 ,  G06F1/324 ,  G06F1/3287 ,  G06F1/3296 ,  H03K3/0231 ,  H03L1/00 ,  H03L1/022 ,  H03L7/00 ,  Y02D10/126 ,  Y02D10/171 ,  Y02D10/172

Abstract: Various example implementations are directed to circuits and methods for generating a clock signal. According to an example embodiment, a circuit arrangement includes a relaxation oscillator configured to output a clock signal. The clock signal has an oscillation frequency dependent on a reference current provided to the relaxation oscillator, an operating temperature of the relaxation oscillator, and a supply voltage used to power the relaxation oscillator. The circuit arrangement also includes a current source coupled to the relaxation oscillator and configured to generate the reference current. The current source is configured to adjust the reference current, in response to a change in one or more of the temperature of the relaxation oscillator and the supply voltage, to inhibit change in the oscillation frequency of the clock signal.

Abstract translation: 各种示例实现涉及用于产生时钟信号的电路和方法。 根据示例性实施例，电路装置包括配置成输出时钟信号的张弛振荡器。 时钟信号具有取决于提供给张弛振荡器的参考电流，张弛振荡器的操作温度和用于为张弛振荡器供电的电源电压的振荡频率。 电路装置还包括耦合到张弛振荡器并被配置为产生参考电流的电流源。 电流源被配置为响应于张弛振荡器的温度和电源电压中的一个或多个的变化来调整参考电流，以抑制时钟信号的振荡频率的变化。

公开(公告)号：US09000800B1

公开(公告)日：2015-04-07

申请号：US13621655

申请日：2012-09-17

Applicant: Xilinx, Inc.

Inventor： Ionut C. Cical ,  Edward Cullen ,  Ivan Bogue

IPC: H03K17/16 ,  H03K19/00 ,  H03K19/003 ,  H04L25/02

CPC classification number: H03K19/0005 ,  H03K19/00384 ,  H04L25/0278

Abstract: A system for calibrating impedance of an input/output (I/O) buffer on a semiconductor die includes: the I/O buffer; a temperature sensor on the semiconductor die; and a supply sensor on the semiconductor die. The temperature sensor is configured to acquire temperature information for calibrating the I/O buffer. The supply sensor is configured to acquire voltage information for calibrating the I/O buffer. The I/O buffer comprises: a memory component coupled to the temperature and supply sensors and configured to store the acquired temperature or voltage information; a logic component coupled to the memory component; and a driver with driver legs. The driver is coupled to the logic component. The logic component is configured to generate driver control signals representing an on/off configuration for the driver legs of the driver based at least in part on the acquired temperature information or the acquired voltage information stored in the memory component.

Abstract translation: 用于校准半导体管芯上的输入/输出（I / O）缓冲器的阻抗的系统包括：I / O缓冲器; 半导体管芯上的温度传感器; 以及半导体管芯上的供应传感器。 温度传感器被配置为获取用于校准I / O缓冲器的温度信息。 供电传感器被配置为获取用于校准I / O缓冲器的电压信息。 I / O缓冲器包括：耦合到温度和电源传感器并被配置为存储获取的温度或电压信息的存储器组件; 耦合到存储器组件的逻辑组件; 和一个司机与司机腿。 驱动器耦合到逻辑组件。 逻辑部件被配置为至少部分地基于所获取的温度信息或存储在存储器部件中的所获取的电压信息来生成表示驾驶员的驾驶员腿的开/关配置的驾驶员控制信号。