公开(公告)号：US20130207720A1

公开(公告)日：2013-08-15

申请号：US13752538

申请日：2013-01-29

申请人： STMICROELECTRONICS (ROUSSET) SAS

发明人： Michel CUENCA ,  Laurent Truphemus

IPC分类号： H03F3/45

CPC分类号： H03F3/45076 ,  H03F1/086 ,  H03F3/45192 ,  H03F3/45771 ,  H03F2200/36 ,  H03F2200/447 ,  H03F2203/45322 ,  H03F2203/45391 ,  H03F2203/45392 ,  H03F2203/45471

摘要： An operational amplifier may include a differential stage comprising two transistors whose gates are respectively linked to the two inputs of the operational amplifier. The sources of the two transistors may be linked to a first current source whose delivered current depends negatively on temperature variations and to a second current source whose delivered current is proportional to absolute temperature. The sum of these two currents may be less dependent on temperature, in that this link of the sources of the two transistors with the two current sources is effected respectively by way of two resistors, and in that the current which passes through the two transistors is imposed of proportional with temperature type, so as to allow substantially temperature-independent elimination of the offset voltage of the operational amplifier while obtaining a temperature-independent constant gain-bandwidth product.

摘要翻译： 运算放大器可以包括差分级，其包括两个晶体管，其栅极分别连接到运算放大器的两个输入端。 两个晶体管的源极可以连接到其传递的电流取决于温度变化的第一电流源以及传递的电流与绝对温度成比例的第二电流源。 这两个电流的总和可能不太依赖于温度，因为两个晶体管与两个电流源的源极的这个连接分别通过两个电阻器实现，并且通过两个晶体管的电流是 施加与温度类型成比例的，以便在获得与温度无关的恒定增益带宽积的同时，允许基本上温度独立地消除运算放大器的偏移电压。

公开(公告)号：US20110086594A1

公开(公告)日：2011-04-14

申请号：US12578819

申请日：2009-10-14

申请人： James Francis McElwee

发明人： James Francis McElwee

IPC分类号： H03F3/45 ,  H03F3/04 ,  H04B1/38

CPC分类号： H03F3/45183 ,  H03F1/301 ,  H03F1/3205 ,  H03F3/193 ,  H03F3/211 ,  H03F3/245 ,  H03F3/45179 ,  H03F2200/447 ,  H03F2200/534 ,  H03F2203/45466 ,  H03F2203/45471 ,  H03F2203/45564 ,  H03F2203/45621

摘要： In one embodiment, a method includes generating a first current in a bias current circuit and biasing an amplifier with the first current when the amplifier is operating in a first temperature range, and generating a second current in the bias current circuit and biasing the amplifier with the second current when the amplifier is operating in a second temperature range. These two currents may correspond to different profiles with respect to temperature, to maintain substantial linearity of the amplifier over the temperature ranges.

摘要翻译： 在一个实施例中，一种方法包括在放大器工作在第一温度范围内时产生偏置电流电路中的第一电流并且利用第一电​​流偏置放大器，以及在偏置电流电路中产生第二电流并且将放大器与 放大器在第二温度范围内工作时的第二电流。 这两个电流可以对应于相对于温度的不同轮廓，以便在温度范围内保持放大器的基本线性。

公开(公告)号：US07633328B2

公开(公告)日：2009-12-15

申请号：US11337589

申请日：2006-01-24

申请人： Andreas Leistner ,  Herman Jalli Ng ,  Hans Sapotta

发明人： Andreas Leistner ,  Herman Jalli Ng ,  Hans Sapotta

IPC分类号： G06G7/12

CPC分类号： H03F3/45098 ,  H03D7/1433 ,  H03D7/1441 ,  H03D7/145 ,  H03D7/1458 ,  H03D7/1491 ,  H03F3/45085 ,  H03F3/45183 ,  H03F2203/45318 ,  H03F2203/45366 ,  H03F2203/45392 ,  H03F2203/45466 ,  H03F2203/45471 ,  H03F2203/45506

摘要： A mixer stage is provided that includes an oscillator, a first input, a second input, a first output, a second output, a set of four controllable amplifier elements, and a first current source. The mixer stage further includes at least one second current source in addition to the first current source, the first current source and the at least one second current source can each be switched on and off by an associated switching input that is connected to an associated oscillator output. Pairs of amplifier elements of the set of four together with at least one of the at least two current sources in its switched-on state form a differential amplifier for an input signal present at the first input and the second input. A method for mixing frequencies is also provided.

摘要翻译： 提供了一种混频器级，其包括振荡器，第一输入端，第二输入端，第一输出端，​​第二输出端，一组四个可控放大器元件和第一电流源。 混频器级还包括除了第一电流源之外的至少一个第二电流源，第一电流源和至少一个第二电流源可以通过相关联的开关输入而被接通和断开，该相关联的开关输入连接到相关联的振荡器 输出。 该组四个的放大器元件对与其接通状态中的至少两个电流源中的至少一个形成差分放大器，用于存在于第一输入端和第二输入端的输入信号。 还提供了一种用于混合频率的方法。

公开(公告)号：US20090295486A1

公开(公告)日：2009-12-03

申请号：US12129636

申请日：2008-05-29

申请人： Ching-Chung Lee

发明人： Ching-Chung Lee

IPC分类号： H03F3/04

CPC分类号： H03F3/45179 ,  G09G3/3688 ,  G09G2310/0291 ,  H03F2203/45244 ,  H03F2203/45471 ,  H03F2203/45476 ,  H03F2203/45504 ,  H03F2203/45506

摘要： An operational amplifier includes an amplifying circuit and a bais current generating circuit. The bias current generating circuit generates a bias current to the amplifying circuit. The amplifying circuit comprises a current adjusting unit and a current mirror. The current adjusting circuit has a storage element, receives a reference current and generating a passing current. The passing current is gradually adjusted utilizing the storage element according to a control signal. The current mirror receives the passing current to generate the bias current.

摘要翻译： 一个运算放大器包括一个放大电路和一个bais电流产生电路。 偏置电流产生电路产生偏置电流到放大电路。 放大电路包括电流调节单元和电流镜。 电流调节电路具有存储元件，接收参考电流并产生通过电流。 根据控制信号利用存储元件逐渐调整通过电流。 电流镜接收通过电流以产生偏置电流。

公开(公告)号：US20090278604A1

公开(公告)日：2009-11-12

申请号：US12268403

申请日：2008-11-10

申请人： Ji-Ting Chen

发明人： Ji-Ting Chen

IPC分类号： H03F3/45

CPC分类号： H03F3/45183 ,  H03F2203/45466 ,  H03F2203/45471 ,  H03F2203/45504 ,  H03F2203/45632 ,  H03F2203/45674

摘要： An operational amplifier capable of enhancing slew rate is disclosed. The operational amplifier includes a first current generator for generating a first bias current, a second current generator for generating a second bias current, an amplification stage, coupled to the first current generator, for generating a amplification signal according to an input signal, an output stage, coupled to the second current generator and the amplification stage, for generating an output signal according to the amplification signal, and a bias current allocation unit, coupled to the first current generator, the second current generator, the amplification stage and the output stage, for reallocating current intensities of the first bias current and the second bias current according to a control signal.

摘要翻译： 公开了一种能够提高转换速率的运算放大器。 运算放大器包括用于产生第一偏置电流的第一电流发生器，用于产生第二偏置电流的第二电流发生器，耦合到第一电流发生器的放大级，用于根据输入信号产生放大信号，输出 耦合到第二电流发生器和放大级，用于根据放大信号产生输出信号;以及偏置电流分配单元，耦合到第一电流发生器，第二电流发生器，放大级和输出级 ，用于根据控制信号重新分配第一偏置电流和第二偏置电流的电流强度。

公开(公告)号：US20090195313A1

公开(公告)日：2009-08-06

申请号：US12105159

申请日：2008-04-17

申请人： Rikky MULLER ,  David Hall WHITNEY

发明人： Rikky MULLER ,  David Hall WHITNEY

IPC分类号： H03F3/45

CPC分类号： H03F3/45183 ,  H03F3/45197 ,  H03F2203/45292 ,  H03F2203/45352 ,  H03F2203/45454 ,  H03F2203/45466 ,  H03F2203/45471 ,  H03F2203/45491 ,  H03F2203/45492 ,  H03F2203/45644

摘要： A circuit includes a pair of input transistors configured as a differential pair and having input terminals configured to receive an input voltage. The circuit also includes a first current source connected to and configured to provide a first tail current to the pair of input transistors, the first tail current being a class-A current having a non-zero quiescent value. The circuit also includes a second current source connected to and configured to provide a second tail current to the pair of input transistors, the second tail current being a class-B current having a zero quiescent value and a non-zero non-quiescent value. The second current source is configured to provide the second tail current as a function of the input voltage.

摘要翻译： 电路包括配置为差分对并且具有被配置为接收输入电压的输入端的一对输入晶体管。 电路还包括连接到并被配置为向一对输入晶体管提供第一尾电流的第一电流源，第一尾电流是具有非零静态值的A类电流。 电路还包括连接到并被配置为向一对输入晶体管提供第二尾电流的第二电流源，第二尾电流是具有零静态值和非零非静态值的B类电流。 第二电流源被配置为提供作为输入电压的函数的第二尾电流。

公开(公告)号：US07525382B2

公开(公告)日：2009-04-28

申请号：US11888921

申请日：2007-08-04

申请人： Hongming An ,  Sudhaker Anumula ,  Howard Chang

发明人： Hongming An ,  Sudhaker Anumula ,  Howard Chang

IPC分类号： H03F3/45

CPC分类号： H03F3/45475 ,  H03F3/45183 ,  H03F2200/405 ,  H03F2203/45248 ,  H03F2203/45454 ,  H03F2203/45466 ,  H03F2203/45471 ,  H03F2203/45702

摘要： A buffer amplifier and an associated method have been provided for slew rate and swing level control in the buffering of a signal. The method accepts an input signal having a voltage swing, a swing control signal, and a slew rate control signal. The voltage swing for each output in a set of serially-connected buffer stages is selected in response to the swing control signal. The selected voltage swing for a subset of buffer stages is modified in response to the slew rate control signal. Selecting the voltage swing for each output entails selecting a source current for each buffer stage. A bias current is generated and mirrored through a current source connected to each buffer stage. Modifying the selected voltage swing for each of the subset of buffer stages includes modifying the bias current to the subset of buffer stages.

摘要翻译： 已经提供了用于缓冲​​信号的压摆率和摆幅电平控制的缓冲放大器和相关联的方法。 该方法接受具有电压摆幅，摆动控制信号和转换速率控制信号的输入信号。 响应于摆动控制信号选择一组串联缓冲级中的每个输出的电压摆幅。 响应于压摆率控制信号修改缓冲级子集的所选电压摆幅。 为每个输出选择电压摆幅需要为每个缓冲段选择一个源电流。 通过连接到每个缓冲级的电流源产生和镜像偏置电流。 对缓冲器级的每个子集修改所选择的电压摆幅包括将偏置电流修改到缓冲器级的子集。

公开(公告)号：US20090033422A1

公开(公告)日：2009-02-05

申请号：US11888921

申请日：2007-08-04

申请人： Hongming An ,  Sudhaker Anumula ,  Howard Chang

发明人： Hongming An ,  Sudhaker Anumula ,  Howard Chang

IPC分类号： H03F3/45

CPC分类号： H03F3/45475 ,  H03F3/45183 ,  H03F2200/405 ,  H03F2203/45248 ,  H03F2203/45454 ,  H03F2203/45466 ,  H03F2203/45471 ,  H03F2203/45702

摘要： A buffer amplifier and an associated method have been provided for slew rate and swing level control in the buffering of a signal. The method accepts an input signal having a voltage swing, a swing control signal, and a slew rate control signal. The voltage swing for each output in a set of serially-connected buffer stages is selected in response to the swing control signal. The selected voltage swing for a subset of buffer stages is modified in response to the slew rate control signal. Selecting the voltage swing for each output entails selecting a source current for each buffer stage. A bias current is generated and mirrored through a current source connected to each buffer stage. Modifying the selected voltage swing for each of the subset of buffer stages includes modifying the bias current to the subset of buffer stages.

公开(公告)号：US07456692B2

公开(公告)日：2008-11-25

申请号：US11341526

申请日：2006-01-30

申请人： Tatsuhiko Maruyama ,  Naohiro Matsui

发明人： Tatsuhiko Maruyama ,  Naohiro Matsui

IPC分类号： H03F1/22 ,  H03F3/45

CPC分类号： H03F3/45188 ,  H03F2203/45052 ,  H03F2203/45392 ,  H03F2203/45466 ,  H03F2203/45471 ,  H03G1/0029 ,  H03G1/0035

摘要： A gain variable amplifier according to an embodiment of the present invention includes: an amplifier circuit amplifying an input signal with a variable gain; and a gain control circuit controlling the gain of the amplifier circuit based on a gain control signal, in which the amplifier circuit includes: an amplifying element amplifying the input signal; an output element series-connected with the amplifying element and outputting a signal amplified with the amplifying element; and a bias circuit changing a potential at a node between the output element and the amplifying element based on the gain control of the gain control circuit.

摘要翻译： 根据本发明实施例的增益可变放大器包括：放大器电路，放大具有可变增益的输入信号; 以及增益控制电路，其基于增益控制信号来控制所述放大器电路的增益，其中所述放大器电路包括：放大元件，放大所述输入信号; 与放大元件串联连接并输出用放大元件放大的信号的输出元件; 以及偏置电路，其基于增益控制电路的增益控制来改变输出元件和放大元件之间的节点处的电位。

公开(公告)号：US20060164149A1

公开(公告)日：2006-07-27

申请号：US11337589

申请日：2006-01-24

申请人： Andreas Leistner ,  Herman Ng ,  Hans Sapotta

发明人： Andreas Leistner ,  Herman Ng ,  Hans Sapotta

IPC分类号： G06F7/44

CPC分类号： H03F3/45098 ,  H03D7/1433 ,  H03D7/1441 ,  H03D7/145 ,  H03D7/1458 ,  H03D7/1491 ,  H03F3/45085 ,  H03F3/45183 ,  H03F2203/45318 ,  H03F2203/45366 ,  H03F2203/45392 ,  H03F2203/45466 ,  H03F2203/45471 ,  H03F2203/45506

摘要： A mixer stage is provided that includes an oscillator, a first input, a second input, a first output, a second output, a set of four controllable amplifier elements, and a first current source. The mixer stage further includes at least one second current source in addition to the first current source, the first current source and the at least one second current source can each be switched on and off by an associated switching input that is connected to an associated oscillator output. Pairs of amplifier elements of the set of four together with at least one of the at least two current sources in its switched-on state form a differential amplifier for an input signal present at the first input and the second input. A method for mixing frequencies is also provided.