公开(公告)号：US08217693B2

公开(公告)日：2012-07-10

申请号：US13026859

申请日：2011-02-14

申请人： Haitao Mei ,  Shoujun Wang ,  William Bereza ,  Tad Kwasniewski

发明人： Haitao Mei ,  Shoujun Wang ,  William Bereza ,  Tad Kwasniewski

IPC分类号： H03L7/06

CPC分类号： H03L7/0896

摘要： Charge pump circuitry is provided that is insensitive to charge sharing and current mismatch effects. The charge pump circuitry has an output node at which a charge pump output voltage is provided. A first current source charges the output node to increase the output voltage or a second current source discharge the output node to decrease the output voltage. The charge pump circuitry uses a unit-gain op-amp circuit to prevent charge sharing effects from affecting the output voltage when switching between discharging and charging operations. A low-pass filter is used to reduce feedback noise on the output node. A replica feedback circuit prevents current mismatch between the currents produced by the first and second current sources. The first and second current sources may be formed using programmable transistors that are adjusted by static control signals provided by programmable elements to further minimize current mismatch.

摘要翻译： 提供了电荷泵电路，对电荷共享和电流失配影响不敏感。 电荷泵电路具有输出节点，在该输出节点处提供电荷泵输出电压。 第一电流源对输出节点充电以增加输出电压，或者第二电流源对输出节点放电以降低输出电压。 电荷泵电路使用单位增益运算放大器电路来防止电荷共享效应在放电和充电操作之间切换时影响输出电压。 低通滤波器用于减少输出节点的反馈噪声。 复制反馈电路防止由第一和第二电流源产生的电流之间的电流失配。 可以使用由可编程元件提供的静态控制信号调整的可编程晶体管来形成第一和第二电流源，以进一步最小化电流失配。

公开(公告)号：US07902888B1

公开(公告)日：2011-03-08

申请号：US12121740

申请日：2008-05-15

申请人： Haitao Mei ,  Shoujun Wang ,  William Bereza ,  Tad Kwasniewski

发明人： Haitao Mei ,  Shoujun Wang ,  William Bereza ,  Tad Kwasniewski

IPC分类号： H03L7/06

CPC分类号： H03L7/0896

摘要： Charge pump circuitry is provided that is insensitive to charge sharing and current mismatch effects. The charge pump circuitry has an output node at which a charge pump output voltage is provided. A first current source charges the output node to increase the output voltage or a second current source discharge the output node to decrease the output voltage. The charge pump circuitry uses a unit-gain op-amp circuit to prevent charge sharing effects from affecting the output voltage when switching between discharging and charging operations. A low-pass filter is used to reduce feedback noise on the output node. A replica feedback circuit prevents current mismatch between the currents produced by the first and second current sources. The first and second current sources may be formed using programmable transistors that are adjusted by static control signals provided by programmable elements to further minimize current mismatch.

摘要翻译： 提供了电荷泵电路，对电荷共享和电流失配影响不敏感。 电荷泵电路具有输出节点，在该输出节点处提供电荷泵输出电压。 第一电流源对输出节点充电以增加输出电压，或者第二电流源对输出节点放电以降低输出电压。 电荷泵电路使用单位增益运算放大器电路来防止电荷共享效应在放电和充电操作之间切换时影响输出电压。 低通滤波器用于减少输出节点的反馈噪声。 复制反馈电路防止由第一和第二电流源产生的电流之间的电流失配。 可以使用由可编程元件提供的静态控制信号调整的可编程晶体管来形成第一和第二电流源，以进一步最小化电流失配。

公开(公告)号：US20110156806A1

公开(公告)日：2011-06-30

申请号：US13026859

申请日：2011-02-14

申请人： Haitao Mei ,  Shoujun Wang ,  William Bereza ,  Tad Kwasniewski

发明人： Haitao Mei ,  Shoujun Wang ,  William Bereza ,  Tad Kwasniewski

IPC分类号： G05F1/10

CPC分类号： H03L7/0896

摘要： Charge pump circuitry is provided that is insensitive to charge sharing and current mismatch effects. The charge pump circuitry has an output node at which a charge pump output voltage is provided. A first current source charges the output node to increase the output voltage or a second current source discharge the output node to decrease the output voltage. The charge pump circuitry uses a unit-gain op-amp circuit to prevent charge sharing effects from affecting the output voltage when switching between discharging and charging operations. A low-pass filter is used to reduce feedback noise on the output node. A replica feedback circuit prevents current mismatch between the currents produced by the first and second current sources. The first and second current sources may be formed using programmable transistors that are adjusted by static control signals provided by programmable elements to further minimize current mismatch.

摘要翻译： 提供了电荷泵电路，对电荷共享和电流失配影响不敏感。 电荷泵电路具有输出节点，在该输出节点处提供电荷泵输出电压。 第一电流源对输出节点充电以增加输出电压，或者第二电流源对输出节点放电以降低输出电压。 电荷泵电路使用单位增益运算放大器电路来防止电荷共享效应在放电和充电操作之间切换时影响输出电压。 低通滤波器用于减少输出节点的反馈噪声。 复制反馈电路防止由第一和第二电流源产生的电流之间的电流失配。 可以使用由可编程元件提供的静态控制信号调整的可编程晶体管来形成第一和第二电流源，以进一步最小化电流失配。

公开(公告)号：US07385429B1

公开(公告)日：2008-06-10

申请号：US11142880

申请日：2005-05-31

申请人： Haitao Mei ,  Shoujun Wang ,  William Bereza ,  Tad Kwasniewski

发明人： Haitao Mei ,  Shoujun Wang ,  William Bereza ,  Tad Kwasniewski

IPC分类号： H03L7/06

CPC分类号： H03L7/0896

摘要： Charge pump circuitry is provided that is insensitive to charge sharing and current mismatch effects. The charge pump circuitry has an output node at which a charge pump output voltage is provided. A first current source charges the output node to increase the output voltage or a second current source discharge the output node to decrease the output voltage. The charge pump circuitry uses a unit-gain op-amp circuit to prevent charge sharing effects from affecting the output voltage when switching between discharging and charging operations. A low-pass filter is used to reduce feedback noise on the output node. A replica feedback circuit prevents current mismatch between the currents produced by the first and second current sources. The first and second current sources may be formed using programmable transistors that are adjusted by static control signals provided by programmable elements to further minimize current mismatch.

摘要翻译： 提供了电荷泵电路，对电荷共享和电流失配影响不敏感。 电荷泵电路具有输出节点，在该输出节点处提供电荷泵输出电压。 第一电流源对输出节点充电以增加输出电压，或者第二电流源对输出节点放电以降低输出电压。 电荷泵电路使用单位增益运算放大器电路来防止电荷共享效应在放电和充电操作之间切换时影响输出电压。 低通滤波器用于减少输出节点的反馈噪声。 复制反馈电路防止由第一和第二电流源产生的电流之间的电流失配。 可以使用由可编程元件提供的静态控制信号调整的可编程晶体管来形成第一和第二电流源，以进一步最小化电流失配。

公开(公告)号：US07580497B2

公开(公告)日：2009-08-25

申请号：US11172559

申请日：2005-06-29

申请人： Shoujun Wang ,  Haitao Mei ,  Bill Bereza ,  Tad Kwasniewski

发明人： Shoujun Wang ,  Haitao Mei ,  Bill Bereza ,  Tad Kwasniewski

IPC分类号： H03D3/24

CPC分类号： H03K3/354 ,  H03B5/1212 ,  H03B5/1228 ,  H03B5/1243 ,  H03L7/087 ,  H03L7/0891 ,  H03L7/093 ,  H03L7/095 ,  H03L7/099 ,  H03L7/0995 ,  H03L7/113 ,  H03L7/14 ,  H03L7/18 ,  H04L7/0004 ,  H04L7/033

摘要： A clock data recovery loop that can be used over a wide range of data rates and maintain second-order behavior includes a nonlinear (e.g., Bang-Bang) phase detector, a charge pump, an RC loop filter, and signal generator (e.g., a voltage controlled oscillator (VCO)). At low data rates, the loop may be operated with the charge pump and loop filter with stable second-order behavior, with the resistor R of the loop filter serving as a proportional path. A separate proportional path is also provided that provides phase detector output directly to a control input of the VCO, while the resistor R of the loop filter is also bypassed. As increasing data rates give rise to third-order effects, the separate proportional path may be activated to maintain second-order behavior.

摘要翻译： 可以在宽范围的数据速率上使用并维持二阶行为的时钟数据恢复循环包括非线性（例如，Bang-Bang）相位检测器，电荷泵，RC环路滤波器和信号发生器（例如， 压控振荡器（VCO））。 在低数据速率下，循环可以用具有稳定二阶行为的电荷泵和环路滤波器来操作，环路滤波器的电阻R用作比例路径。 还提供了单独的比例路径，其将相位检测器输出直接提供给VCO的控制输入端，而环路滤波器的电阻器R也被旁路。 随着数据速率的增加引起三阶效应，可以激活单独的比例路径以维持二阶行为。

公开(公告)号：US20070002993A1

公开(公告)日：2007-01-04

申请号：US11172559

申请日：2005-06-29

申请人： Shoujun Wang ,  Haitao Mei ,  Bill Bereza ,  Tad Kwasniewski

发明人： Shoujun Wang ,  Haitao Mei ,  Bill Bereza ,  Tad Kwasniewski

IPC分类号： H03D3/24

CPC分类号： H03K3/354 ,  H03B5/1212 ,  H03B5/1228 ,  H03B5/1243 ,  H03L7/087 ,  H03L7/0891 ,  H03L7/093 ,  H03L7/095 ,  H03L7/099 ,  H03L7/0995 ,  H03L7/113 ,  H03L7/14 ,  H03L7/18 ,  H04L7/0004 ,  H04L7/033

摘要： A clock data recovery loop that can be used over a wide range of data rates and maintain second-order behavior includes a nonlinear (e.g., Bang-Bang) phase detector, a charge pump, an RC loop filter, and signal generator (e.g., a voltage controlled oscillator (VCO)). At low data rates, the loop may be operated with the charge pump and loop filter with stable second-order behavior, with the resistor R of the loop filter serving as a proportional path. A separate proportional path is also provided that provides phase detector output directly to a control input of the VCO, while the resistor R of the loop filter is also bypassed. As increasing data rates give rise to third-order effects, the separate proportional path may be activated to maintain second-order behavior.

摘要翻译： 可以在宽范围的数据速率上使用并维持二阶行为的时钟数据恢复循环包括非线性（例如，Bang-Bang）相位检测器，电荷泵，RC环路滤波器和信号发生器（例如， 压控振荡器（VCO））。 在低数据速率下，循环可以用具有稳定二阶行为的电荷泵和环路滤波器来操作，环路滤波器的电阻R用作比例路径。 还提供了单独的比例路径，其将相位检测器输出直接提供给VCO的控制输入端，而环路滤波器的电阻器R也被旁路。 随着数据速率的增加引起三阶效应，可以激活单独的比例路径以维持二阶行为。

公开(公告)号：US20050093580A1

公开(公告)日：2005-05-05

申请号：US10702195

申请日：2003-11-04

申请人： Mashkoor Baig ,  Shoujun Wang ,  Haitao Mei ,  Bill Bereza ,  Tad Kwasniewski

发明人： Mashkoor Baig ,  Shoujun Wang ,  Haitao Mei ,  Bill Bereza ,  Tad Kwasniewski

IPC分类号： H04L25/02 ,  H04L25/03 ,  H04L25/08 ,  H04L25/10 ,  H03K5/22

CPC分类号： H04L25/0288 ,  H04L25/0272

摘要： Pre-emphasis is given to differential output signals emanating from a pair of output nodes by initially (after an input data signal transition) connecting at least two current circuits to only one of the nodes. After a time delay, one of the current circuits is switched to connect only to the node to which the current circuits were not previously connected if there has been no further transition in the input data signal during the time delay. If only single-ended (i.e., non-differential) output is desired, only one of the output nodes is used as an output signal source. More than two current circuits may be used, and their switching from one node to the other may be performed progressively to provide pre-emphasis having any of many different characteristics.

摘要翻译： 最初（在输入数据信号转换之后）将至少两个电流电路连接到仅一个节点，从一对输出节点发出的差分输出信号预加重。 在时间延迟之后，如果在时间延迟期间输入数据信号中没有进一步转换，则当前电路之一被切换以仅连接到当前电路未连接到的节点。 如果仅需要单端（即非差分）输出，则仅使用一个输出节点作为输出信号源。 可以使用两个以上的电流电路，并且可以逐渐地执行从一个节点到另一个节点的切换，以提供具有许多不同特征的预加重。

公开(公告)号：US07388443B2

公开(公告)日：2008-06-17

申请号：US11410672

申请日：2006-04-25

申请人： Mashkoor Baig ,  Shoujun Wang ,  Haitao Mei ,  Bill Bereza ,  Tad Kwasniewski

发明人： Mashkoor Baig ,  Shoujun Wang ,  Haitao Mei ,  Bill Bereza ,  Tad Kwasniewski

IPC分类号： H03B5/24 ,  H03L7/099

CPC分类号： G06F1/04 ,  H03K3/0315 ,  H03K3/0322 ,  H03L7/0995 ,  H03L7/10

摘要： An integrated circuit (IC) includes a ring oscillator. One may tune the ring oscillator by controlling a power supply of the ring oscillator. One may further tune ring oscillator by varying a capacitance of at least one varactor. Using the tuning techniques, one may tune the output frequency of the ring oscillator to a desired frequency.

摘要翻译： 集成电路（IC）包括环形振荡器。 可以通过控制环形振荡器的电源来调谐环形振荡器。 可以通过改变至少一个变容二极管的电容来进一步调谐环形振荡器。 使用调谐技术，可以将环形振荡器的输出频率调谐到所需的频率。

公开(公告)号：US07239849B2

公开(公告)日：2007-07-03

申请号：US10702196

申请日：2003-11-04

申请人： Bill Bereza ,  Mashkoor Baig ,  Shoujun Wang ,  Haitao Mei ,  Tad Kwasniewski

发明人： Bill Bereza ,  Mashkoor Baig ,  Shoujun Wang ,  Haitao Mei ,  Tad Kwasniewski

IPC分类号： H04B17/00

CPC分类号： G01R31/31722 ,  G01R31/31724 ,  G06F17/5054

摘要： Possible deficiencies of a communication link are detected and automatically counteracted, at least to some degree. The deficiencies addressed can include phase shift and attenuation compensation. The counter-action can include adjustment of pre-emphasis given a signal applied to the communication link and/or adjustment of equalization given a signal received from the communication link.

摘要翻译： 至少在一定程度上检测并自动抵消通信链路的可能缺陷。 所解决的缺陷可以包括相移和衰减补偿。 对于给定从通信链路接收到的信号，反作用可以包括给予施加到通信链路的信号的预加重的调整和/或调整均衡。

公开(公告)号：US07224191B1

公开(公告)日：2007-05-29

申请号：US11601017

申请日：2006-11-17

申请人： Shoujun Wang ,  Bill Bereza ,  Tad Kwasniewski ,  Mashkoor Baig ,  Haitao Mei

发明人： Shoujun Wang ,  Bill Bereza ,  Tad Kwasniewski ,  Mashkoor Baig ,  Haitao Mei

IPC分类号： G01R19/00 ,  H03K5/22

CPC分类号： G01R19/10 ,  G01R19/04 ,  G01R19/16566 ,  H04L25/0272

摘要： Circuitry and methods allow signal detection based entirely on differential voltage pairs. An incoming differential data signal is processed by separate full-wave rectifiers to extract high and low peak voltage envelopes. The rectifiers utilize negative feedback to ensure accurate envelope detection, and can detect peaks regardless of incoming signal polarity. The extracted envelopes are compared to a differential pair of threshold voltages. If the envelope signals have a smaller voltage difference than that of the threshold signals, the final output of the detector indicates that a loss-of-signal condition has occurred. Fully differential operation makes the detector independent of common-mode voltage, and thus more robust.