公开(公告)号：US07936208B2

公开(公告)日：2011-05-03

申请号：US12184148

申请日：2008-07-31

申请人： Steven Mark Clements ,  Hayden C. Cranford, Jr. ,  Amar Chandra Mahadeo Dwarka ,  John Farley Ewen

发明人： Steven Mark Clements ,  Hayden C. Cranford, Jr. ,  Amar Chandra Mahadeo Dwarka ,  John Farley Ewen

IPC分类号： G05F3/02

CPC分类号： G05F3/205

摘要： A method and circuit for providing a bias voltage to a MOS device is disclosed. The method and circuit comprise utilizing at least one diode connected circuit to provide a voltage that tracks process, voltage and temperature variations of a semiconductor device. The method and circuit includes utilizing a current mirror circuit coupled to the at least one diode connected circuit to generate a bias voltage for the body of the semiconductor device from the voltage. The bias voltage allows for compensation for the process, voltage and temperature variations.

摘要翻译： 公开了一种用于向MOS器件提供偏置电压的方法和电路。 该方法和电路包括利用至少一个二极管连接的电路来提供跟踪半导体器件的工艺，电压和温度变化的电压。 所述方法和电路包括利用耦合到所述至少一个二极管连接的电路的电流镜电路，以从所述电压产生所述半导体器件的主体的偏置电压。 偏置电压允许对过程，电压和温度变化进行补偿。

公开(公告)号：US20100026376A1

公开(公告)日：2010-02-04

申请号：US12184148

申请日：2008-07-31

申请人： Steven Mark Clements ,  Hayden C. Cranford, JR. ,  Amar Chandra Mahadeo Dwarka ,  John Farley Ewen

发明人： Steven Mark Clements ,  Hayden C. Cranford, JR. ,  Amar Chandra Mahadeo Dwarka ,  John Farley Ewen

IPC分类号： G05F3/26

CPC分类号： G05F3/205

摘要： A method and circuit for providing a bias voltage to a MOS device is disclosed. The method and circuit comprise utilizing at least one diode connected circuit to provide a voltage that tracks process, voltage and temperature variations of a semiconductor device. The method and circuit includes utilizing a current mirror circuit coupled to the at least one diode connected circuit to generate a bias voltage for the body of the semiconductor device from the voltage. The bias voltage allows for compensation for the process, voltage and temperature variations.

摘要翻译： 公开了一种用于向MOS器件提供偏置电压的方法和电路。 该方法和电路包括利用至少一个二极管连接的电路来提供跟踪半导体器件的工艺，电压和温度变化的电压。 所述方法和电路包括利用耦合到所述至少一个二极管连接的电路的电流镜电路，以从所述电压产生所述半导体器件的主体的偏置电压。 偏置电压允许对过程，电压和温度变化进行补偿。

公开(公告)号：US06297685B1

公开(公告)日：2001-10-02

申请号：US09593997

申请日：2000-06-14

申请人： John Farley Ewen ,  Stephen Charles Wilkinson-Gruber

发明人： John Farley Ewen ,  Stephen Charles Wilkinson-Gruber

IPC分类号： H03K342

CPC分类号： H03K19/00376

摘要： An output buffer provides a stable, predetermined low voltage differential over power supply, temperature, and process variations yet has a high speed of operation. More particularly, a data path of an output buffer includes an emitter-coupled differential amplifier followed by an output section of two level-shifting emitter followers. A predetermined operating current biases the differential amplifier for unsaturated operation and a reference current biases the output section for unsaturated operation. The data path remains unencumbered by compensation circuitry to preserve high speed operation. Instead, a voltage compensator biases the differential amplifier to compensate, at least in part, for variations in a supply voltage. In addition, a variable biasing current to the voltage compensator with a predetermined temperature coefficient may further temperature compensate the differential amplifier. In addition to such “upstream” compensation, the output buffer may further include “downstream” temperature compensation by the addition of a VBE multiplier circuit to the reference current biasing of the output section. Additional temperature and level-shifting compensation may also be achieved through cascading a plurality of buffer stages.

摘要翻译： 输出缓冲器在电源，温度和工艺变化上提供稳定的预定低压差，但具有高速运行。 更具体地，输出缓冲器的数据路径包括发射极耦合的差分放大器，后面是两个电平移动发射极跟随器的输出部分。 预定的工作电流偏置用于不饱和操作的差分放大器，并且参考电流偏置用于不饱和操作的输出部分。 数据路径保持不受补偿电路的阻碍，以保持高速运行。 相反，电压补偿器偏置差分放大器，至少部分地补偿电源电压的变化。 此外，具有预定温度系数的对电压补偿器的可变偏置电流可以进一步温度补偿差分放大器。 除了这种“上游”补偿之外，输出缓冲器还可以通过将VBE乘法器电路加到输出部分的参考电流偏置来进一步包括“下游”温度补偿。 也可以通过级联多个缓冲级来实现额外的温度和电平移位补偿。

公开(公告)号：US06862322B1

公开(公告)日：2005-03-01

申请号：US09574239

申请日：2000-05-19

申请人： John Farley Ewen ,  William K. Hogan ,  Kenneth Paul Jackson ,  Michael William Marlowe ,  Clint Lee Schow

发明人： John Farley Ewen ,  William K. Hogan ,  Kenneth Paul Jackson ,  Michael William Marlowe ,  Clint Lee Schow

IPC分类号： H03F3/08 ,  H03G1/00 ,  H03G3/30 ,  H03H19/00 ,  H03K9/00

CPC分类号： H03G1/0088 ,  H03F3/087 ,  H03F2203/7212 ,  H03G3/3084 ,  H03G2201/103 ,  H03G2201/502 ,  H03H19/008

摘要： A switchable bandwidth optical receiver is implemented in a front-end of the receiver in at least one of three ways. A switchable impedance may be provided at the input to a preamplifier of the front end, the preamplifier of the front-end may have a switchable impedance therein, and/or a switchable filter may be provided at an output of the preamplifier.

摘要翻译： 可切换带宽光接收机以三种方式中的至少一种在接收机的前端实现。 可以在前端的前置放大器的输入处提供可切换阻抗，前端的前置放大器可以在其中具有可切换的阻抗，和/或可以在前置放大器的输出处提供可切换的滤波器。

公开(公告)号：US06265857B1

公开(公告)日：2001-07-24

申请号：US09218340

申请日：1998-12-22

申请人： Kevin Paul Demsky ,  John Farley Ewen ,  Matthew James Paschal

发明人： Kevin Paul Demsky ,  John Farley Ewen ,  Matthew James Paschal

IPC分类号： G05F308

CPC分类号： G05F3/245 ,  Y10S323/907

摘要： The constant current source circuit provides current that compensates for changes in performance resulting from changes of temperature. The circuit mixes variable amounts of current having a negative temperature coefficient with current having a positive temperature coefficient. Analog and digital embodiments of the circuit are disclosed. In the analog embodiment, the amount of current having a positive temperature coefficient is added to an amount of current having a negative temperature coefficient as determined by the voltage difference between a variable control voltage input to transistors and a bandgap reference voltage. A transistor in each of two current selectors is connected to the variable control voltage, one of which is connected to ground and the other of which is output; and another transistor in each current selector is connected to the reference voltage, and again one transistor is grounded and the other is output whose current is mixed with the output from the transistor in the first current selector connected to the variable control voltage. A continuous range of temperature coefficients are realizable by varying the control voltage with respect to the bandgap reference voltage. The digital embodiment has a digital-to-analog converter connected to a bias voltage from the current having a positive temperature coefficient and a second digital-to-analog converter connected to a second bias voltage from the current having a negative temperature coefficient. A digital input signal to a corresponding switch determines if its respective transistor in each of the digital-to-analog converters conduct current. The two digital-to-analog converters may be configured in a common centroid arrangement of integrated complementary unit cells. The constant current source circuit can be used to drive off-chip parallel loads such as VCSELs.

摘要翻译： 恒流源电路提供电流，补偿温度变化引起的性能变化。 该电路将具有负温度系数的可变量的电流与具有正温度系数的电流混合。 公开了电路的模拟和数字实施例。 在模拟实施例中，具有正温度系数的电流量被加到由输入到晶体管的可变控制电压和带隙参考电压之间的电压差确定的具有负温度系数的电流量。 两个电流选择器中的每一个中的晶体管连接到可变控制电压，其中一个连接到地，另一个连接到输出; 并且每个电流选择器中的另一个晶体管连接到参考电压，并且一个晶体管接地，另一个晶体管被输出，其电流与连接到可变控制电压的第一电流选择器中的晶体管的输出混合。 可以通过相对于带隙参考电压改变控制电压来实现连续的温度系数范围。 数字实施例具有数模转换器，其连接到具有正温度系数的电流的偏置电压和从具有负温度系数的电流连接到第二偏置电压的第二数模转换器。 到相应开关的数字输入信号确定其每个数模转换器中的相应晶体管是否导通电流。 两个数模转换器可以以集成的互补单元单元的公共质心布置来配置。 恒流源电路可用于驱动片外并联负载，如VCSEL。