公开(公告)号：US11181426B1

公开(公告)日：2021-11-23

申请号：US16268124

申请日：2019-02-05

Applicant: Xilinx, Inc.

Inventor： Edward Cullen ,  Umanath R. Kamath ,  John K. Jennings ,  Diarmuid Collins ,  Ionut C. Cical

IPC: G01K7/00 ,  G01K15/00 ,  G01K7/01 ,  G01K1/00

Abstract: A temperature sensor includes a current source to produce a first bias current and a second bias current, a plurality of diodes, and temperature estimation circuitry. The plurality of diodes includes at least a first diode to receive the first bias current and a second diode to receive the second bias current. The temperature estimate circuitry measures a first voltage bias across the first diode resulting from the first bias current and a second voltage bias across the second diode resulting from the second bias current, and estimates a temperature of an environment of the temperature sensor based at least in part on the first voltage bias and the second voltage bias. The temperature sensor further includes error detection circuitry to measure at least one of the first or second bias currents and determine an amount of error in the temperature estimate based at least in part on the measurement.

公开(公告)号：US10243526B1

公开(公告)日：2019-03-26

申请号：US15895829

申请日：2018-02-13

Applicant: Xilinx, Inc.

Inventor： Ionut C. Cical ,  John K. Jennings ,  Diarmuid Collins

IPC: H03F3/45 ,  H03F1/30 ,  H03F3/195 ,  G05F3/26

Abstract: A device may include a voltage-to-current converter circuit having an operational transconductance amplifier (OTA), the voltage-to-current converter circuit for generating a bias current that is proportional to a reference voltage at a reference voltage input port of the OTA, and a bias current feedback path for providing the bias current to a bias current input port of the OTA. The device may further include a startup current generator circuit coupled to the bias current input port of the OTA, the startup current generator circuit controllable to provide a startup current to the bias current input port during a startup of the device and to be deactivated after the startup of the device.

公开(公告)号：US09935597B2

公开(公告)日：2018-04-03

申请号：US15167197

申请日：2016-05-27

Applicant: Xilinx, Inc.

Inventor： Christophe Erdmann ,  Diarmuid Collins ,  Edward Cullen ,  Ionut C. Cical

IPC: H03F3/45 ,  H03F1/56

CPC classification number: H03F3/45179 ,  H03F1/301 ,  H03F1/56 ,  H03F3/45183 ,  H03F2200/459 ,  H03F2203/45288

Abstract: A circuit for receiving an input signal is described. The receiver comprises a first receiver input configured to receive a first input of a differential input signal; a second receiver input configured to receive a second input of a differential input signal; a differential pair having an inverting input and a non-inverting input; a first impedance matching element coupled to the differential pair, wherein the first impedance matching element provides DC impedance matching from the inverting input and non-inverting input of the differential pair; and a second impedance matching element coupled to the differential pair, wherein the second impedance matching element provides AC impedance matching from the inverting input and non-inverting input of the differential pair.

公开(公告)号：US11003204B1

公开(公告)日：2021-05-11

申请号：US16216990

申请日：2018-12-11

Applicant: Xilinx, Inc.

Inventor： Ionut C. Cical ,  Edward Cullen ,  Brendan Farley

IPC: G06F1/08 ,  G06F1/324 ,  H03K3/0231 ,  H03K3/011 ,  G06F1/3296 ,  H03B5/12 ,  H03L7/099

Abstract: Examples described herein provide for a relaxation oscillator and corresponding methods of operation. In an example, a circuit includes a dynamically controllable current source, a capacitor, and an oscillator generation circuit. The dynamically controllable current source includes a digitally tunable current mirror configured to generate a current. The digitally tunable current mirror includes multiple transistors configured to be selectively electrically connected in parallel to alter a gain of the digitally tunable current mirror to control the current. The capacitor is selectively electrically connected to the dynamically controllable current source. The oscillator generation circuit is electrically connected to the capacitor. The oscillator generation circuit is configured to generate an oscillation signal in response to a voltage of the capacitor.

公开(公告)号：US20190172504A1

公开(公告)日：2019-06-06

申请号：US15832515

申请日：2017-12-05

Applicant: Xilinx, Inc.

Inventor： Umanath R. Kamath ,  John K. Jennings ,  Edward Cullen ,  Ionut C. Cical ,  Darragh Walsh

IPC: G11C5/14 ,  G01K7/01 ,  G05F3/24

Abstract: An example voltage reference circuit includes: a reference circuit comprising a first circuit configured to generate a proportional-to-temperature current and corresponding first control voltage and a second circuit configured to generate a complementary-to-temperature current and corresponding second control voltage; a first current source coupled to a first load circuit, the first current source generating a sum current of the proportional-to-temperature current and the complementary-to-temperature current in response to the first and second control voltages, the first load circuit generating a zero temperature coefficient (Tempco) voltage from the sum current; and a second current source coupled to a second load circuit, the second current source generating the sum current of the proportional-to-temperature current and the complementary-to-temperature current in response to the first and second control voltages, the second load circuit generating a negative Tempco voltage from the sum current and the complementary-to-temperature current.

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。

公开(公告)号：US10290330B1

公开(公告)日：2019-05-14

申请号：US15832515

申请日：2017-12-05

Applicant: Xilinx, Inc.

Inventor： Umanath R. Kamath ,  John K. Jennings ,  Edward Cullen ,  Ionut C. Cical ,  Darragh Walsh

IPC: G11C5/14 ,  G05F3/24 ,  G01K7/01

Abstract: An example voltage reference circuit includes: a reference circuit comprising a first circuit configured to generate a proportional-to-temperature current and corresponding first control voltage and a second circuit configured to generate a complementary-to-temperature current and corresponding second control voltage; a first current source coupled to a first load circuit, the first current source generating a sum current of the proportional-to-temperature current and the complementary-to-temperature current in response to the first and second control voltages, the first load circuit generating a zero temperature coefficient (Tempco) voltage from the sum current; and a second current source coupled to a second load circuit, the second current source generating the sum current of the proportional-to-temperature current and the complementary-to-temperature current in response to the first and second control voltages, the second load circuit generating a negative Tempco voltage from the sum current and the complementary-to-temperature current.

公开(公告)号：US09377795B1

公开(公告)日：2016-06-28

申请号：US14543526

申请日：2014-11-17

Applicant: Xilinx, Inc.

Inventor： Ionut C. Cical ,  Edward Cullen

IPC: G05F1/46 ,  H03F1/30

CPC classification number: G05F1/463 ,  G05F1/468 ,  H03F1/30 ,  H03F2200/447

Abstract: In an example, a temperature-corrected voltage reference circuit for use in an integrated circuit (IC) includes a voltage reference circuit, a programmable gain amplifier, and a digital control circuit. The programmable gain amplifier includes a first input coupled to the voltage reference circuit, a second input coupled to receive a control signal, and an output coupled to provide a temperature-corrected voltage reference. The digital control circuit includes an input coupled to receive a temperature signal indicative of temperature of the IC and an output coupled to the second input of the programmable gain amplifier, the digital control circuit generating the control signal in response to the temperature signal.

Abstract translation: 在一个示例中，用于集成电路（IC）的温度校正的电压参考电路包括电压参考电路，可编程增益放大器和数字控制电路。 可编程增益放大器包括耦合到电压参考电路的第一输入，耦合以接收控制信号的第二输入，以及耦合以提供温度校正的电压基准的输出。 数字控制电路包括耦合以接收指示IC的温度的温度信号和耦合到可编程增益放大器的第二输入的输出的输入，数字控制电路响应于温度信号产生控制信号。

公开(公告)号：US08836409B1

公开(公告)日：2014-09-16

申请号：US13792949

申请日：2013-03-11

Applicant: Xilinx, Inc.

Inventor： Edward Cullen ,  April M. Graham ,  Ionut C. Cical

IPC: H03K17/687

CPC classification number: H03K17/08122 ,  H03K17/06 ,  H03K2017/066 ,  H03K2217/0054

Abstract: An apparatus includes: a switch having a first transistor, the first transistor having a gate, wherein the switch is connected between a first pad and a second pad; and a first biasing circuit coupled to the gate of the first transistor, wherein the first biasing circuit is configured for outputting a first voltage, the first voltage being the lowest one of (1) a voltage of the first pad, (2) a voltage of the second pad, and (3) a ground voltage; wherein the gate of the first transistor is driven by the first voltage from the first biasing circuit in response to an enable signal being set for configuring the switch to be off.

Abstract translation: 一种装置包括：具有第一晶体管的开关，所述第一晶体管具有栅极，其中所述开关连接在第一焊盘和第二焊盘之间; 以及耦合到所述第一晶体管的栅极的第一偏置电路，其中所述第一偏置电路被配置为输出第一电压，所述第一电压是（1）第一焊盘的电压中的最低电压，（2） 的第二焊盘，（3）接地电压; 其中响应于将所述开关配置为断开而设置的使能信号，来自所述第一偏置电路的所述第一晶体管的栅极被所述第一电压驱动。