公开(公告)号：US07068107B2

公开(公告)日：2006-06-27

申请号：US10805297

申请日：2004-03-22

申请人： Wen-Chi Wang ,  Chao-Cheng Lee ,  Jui-Cheng Huang ,  Jui-Yuan Tsai

发明人： Wen-Chi Wang ,  Chao-Cheng Lee ,  Jui-Cheng Huang ,  Jui-Yuan Tsai

IPC分类号： H03F3/30

CPC分类号： H03G1/0088

摘要： The variable gain amplifier of the present invention includes at least an operation amplifier. By choosing one of output stages, a feedback resistor is selected and the gain of the variable gain amplifier is decided according to the resistance of the selected feedback resistor, as desired. By adjusting the gain of the variable gain amplifier, the received signals can be amplified or attenuated in accordance with design requirement. The variable gain amplifier can include a two-stage architecture, in which a first stage is used for coarse gain adjustment and a second stage is used for fine gain adjustment. The gain of the two-stage variable gain amplifier can be easily adjusted to a desired value.

摘要翻译： 本发明的可变增益放大器至少包括一个运算放大器。 通过选择输出级之一，根据需要选择反馈电阻，并根据所选反馈电阻的电阻决定可变增益放大器的增益。 通过调整可变增益放大器的增益，接收信号可以根据设计要求进行放大或衰减。 可变增益放大器可以包括两级架构，其中第一级用于粗增益调整，第二级用于精细增益调整。 两级可变增益放大器的增益可以很容易地调整到所需的值。

公开(公告)号：US20050285676A1

公开(公告)日：2005-12-29

申请号：US10878849

申请日：2004-06-28

申请人： Mark Jones

发明人： Mark Jones

IPC分类号： H03F3/30 ,  H03F3/45

CPC分类号： H03F3/45094 ,  H03F3/3022 ,  H03F3/3066 ,  H03F3/45192 ,  H03F2200/372 ,  H03F2203/45248

摘要： A folded-cascode operational amplifier including a differential input stage (19) and a class AB output stage (20) includes a first slew boost current mirror (13) and a second slew boost current mirror (14) having inputs connected to drains of the input transistors, respectively. Each current mirror amplifies excess tail current steered into it as a result of a large, rapid input signal transition. The amplified excess tail current is used to boost the slew rate of the class AB output stage. in accordance with a first polarity of the difference between the first (Vin+) and second (Vin−) input voltages. The drains of the input transistors are maintained at a voltage less than a transistor threshold voltage above the ground except during slewing operation of the operational amplifier to effectively isolate the current mirrors except during slewing operation.

摘要翻译： 包括差分输入级（19）和AB类输出级（20）的折叠共源共栅运算放大器包括第一压摆升压电流镜（13）和第二压摆升压电流镜（14），其具有连接到 输入晶体管。 由于大的快速输入信号转换的结果，每个电流镜放大了转向其中的多余的尾部电流。 放大的过流尾电流用于提高AB级输出级的转换速率。 根据第一（Vin +）和第二（Vin-）输入电压之间的差的第一极性。 除了在运行放大器的回转操作期间，输入晶体管的漏极保持在低于地面以上的晶体管阈值电压的电压，以有效地隔离电流镜，除了在回转操作期间。

公开(公告)号：US20050280468A1

公开(公告)日：2005-12-22

申请号：US10975107

申请日：2004-10-28

申请人： Jungwoo Song

发明人： Jungwoo Song

IPC分类号： H03F1/30 ,  H03F3/18 ,  H03F3/30 ,  H03F3/345

CPC分类号： H03F3/30 ,  H03F1/301 ,  H03F3/3022 ,  H03F3/345

摘要： Provided is an amplifier including a system for controlling output stage quiescent current. The amplifier includes a driving stage including first pmos and nmos transistors coupled together, and an output stage connected to the driving stage. The output stage includes second pmos and nmos transistors coupled together. The amplifier also includes a quiescent control stage connected to the driving stage and including third pmos and nmos transistors coupled together, fourth pmos coupled to third pmos and 4th nmos coupled to 3rd nmos. A topology of the coupled third pmos and nmos transistors substantially matches a topology of the coupled first pmos and nmos transistors, and 4th pmos and nmos match to 2nd pmos and nmos.

摘要翻译： 提供了一种包括用于控制输出级静态电流的系统的放大器。 放大器包括驱动级，其包括耦合在一起的第一pmos和nmos晶体管，以及连接到驱动级的输出级。 输出级包括耦合在一起的第二pmos和nmos晶体管。 放大器还包括连接到驱动级的静态控制级，并且包括耦合在一起的第三pmos和nmos晶体管，耦合到第三薄膜晶体管的第四薄膜和耦合到第三薄膜晶体管的第四薄膜 > nmos。 耦合的第三pmos和nmos晶体管的拓扑结构基本上匹配耦合的第一pmos和nmos晶体管的拓扑，并且第4个pmos和nmos匹配到第2个pmos和nmos。

公开(公告)号：US06970044B2

公开(公告)日：2005-11-29

申请号：US10829206

申请日：2004-04-22

申请人： Ryosuke Inagaki

发明人： Ryosuke Inagaki

IPC分类号： H03F3/30 ,  H03F3/45

CPC分类号： H03F3/303

摘要： The present invention is provided with a first, a second and a third differential amplifier which operate at a source voltage with respect to a reference voltage or a voltage between these; an output stage having a first and a second transistor driven complimentarily; a first resistor connected to an input terminal; a second resistor connected to an output of the first differential amplifier circuit; and a first and a second feed back resistor connected to an output terminal of the output stage circuit.

摘要翻译： 本发明提供了一个第一，第二和第三差分放大器，它们以相对于基准电压或它们之间的电压的源极电压工作; 具有第一和第二晶体管驱动的输出级; 连接到输入端的第一电阻器; 连接到所述第一差分放大器电路的输出端的第二电阻器; 以及连接到输出级电路的输出端的第一和第二反馈电阻。

公开(公告)号：US06967530B2

公开(公告)日：2005-11-22

申请号：US10789468

申请日：2004-02-27

申请人： Jun-Ichi Omata ,  Yuji Yamanaka ,  Tomomi Oda

发明人： Jun-Ichi Omata ,  Yuji Yamanaka ,  Tomomi Oda

IPC分类号： H03F3/181 ,  H03F3/30 ,  H03F3/45 ,  H03F3/68 ,  H03F3/72 ,  H03F1/14

CPC分类号： H03F3/3022 ,  H03F3/45183 ,  H03F3/68 ,  H03F3/72 ,  H03F2200/03 ,  H03F2203/45366 ,  H03F2203/45504 ,  H03F2203/45506 ,  H03F2203/7212

摘要： A circuit for a power amplifier is disclosed which amplifies and outputs an audio signal by amplifying an input audio signal using first and second differential circuits, and driving a push-pull output transistor with the outputs from the first and second differential circuits. The circuit includes a signal generating part generating a disconnection timing signal for disconnecting a bias current reducing activation currents of the first and second differential circuits based on a switch control signal, and positive feedback loops of the first and second differential circuits. A switch part is disposed in each of the positive feedback loops of the first and second differential circuits, disconnecting the positive feedback loops in response to the disconnection timing signal. A bias part stops the operation of the first and second differential circuits by reducing the activation currents of the first and second differential circuits by reduction of the bias currents.

摘要翻译： 公开了一种用于功率放大器的电路，其通过使用第一和第二差分电路放大输入音频信号来放大并输出音频信号，并且利用来自第一和第二差分电路的输出来驱动推挽输出晶体管。 该电路包括产生断开定时信号的信号产生部分，用于根据开关控制信号和第一和第二差分电路的正反馈回路来断开第一和第二差分电路的减小激活电流的偏置电流。 开关部分设置在第一和第二差分电路的每个正反馈回路中，以响应断开定时信号断开正反馈回路。 偏置部分通过减少偏置电流来减小第一和第二差分电路的激活电流来停止第一和第二差分电路的操作。

公开(公告)号：US20050207260A1

公开(公告)日：2005-09-22

申请号：US11082422

申请日：2005-03-17

申请人： Jeffrey Lehto

发明人： Jeffrey Lehto

IPC分类号： G11C8/00 ,  H03F3/30 ,  H03F3/45

CPC分类号： H03F3/45946 ,  H03F3/3081 ,  H03F3/45511

摘要： Amplifier circuits that generate CM currents are provided. Amplifier circuits that generator DM currents are also provided. Fully differential current feedback amplifier circuits with separate CM and DM inputs are also provided. Such amplifier circuits combine the benefits of CFA designs, such as high slew rate and bandwidth, with independent control of DM and CM signals. This description is not intended to be a complete description of, or limit the scope of, the invention. Other features, aspects, and objects of the invention can be obtained from a review of the specification, the figures and the claims.

摘要翻译： 提供产生CM电流的放大器电路。 还提供发生器DM电流的放大器电路。 还提供了具有单独CM和DM输入的全差分电流反馈放大器电路。 这种放大器电路结合了CFA设计的优点，如高压摆率和带宽，独立控制DM和CM信号。 本说明书不是对本发明的完整描述或限制本发明的范围。 本发明的其他特征，方面和目的可以从对说明书，附图和权利要求的评论中获得。

公开(公告)号：US06937093B2

公开(公告)日：2005-08-30

申请号：US10752966

申请日：2004-01-07

申请人： Terence D. Tekushan

发明人： Terence D. Tekushan

IPC分类号： H03F3/183 ,  H03F3/28 ,  H03F3/30

CPC分类号： H03F3/181 ,  H03F3/28 ,  H03F2200/541

摘要： An amplifier is described including a pair of cathode-coupled pentode vacuum tubes. A first pentode of the pair includes a control grid configured to receive an input signal. A second pentode of the pair includes a control grid configured to be coupled to an input reference signal. A cascaded voltage regulator includes a first stage configured to generate a plate reference voltage for providing voltage to a plate of each pentode. The regulator includes a second stage configured to generate a screen reference voltage based on the plate reference voltage for providing voltage to a screen grid of each pentode. The amplifier can also include a push-pull output stage having a servo circuit configured to adjust the control bias signal for one of a pair of vacuum tubes included in the stage until the plate currents in the pair of tubes are substantially equal.

摘要翻译： 描述了包括一对阴极耦合的五极管真空管的放大器。 该对的第一个五极管包括配置成接收输入信号的控制网格。 该对的第二个五极管包括被配置为耦合到输入参考信号的控制网格。 级联电压调节器包括第一级，其被配置为产生用于向每个五极管的板提供电压的板参考电压。 调节器包括第二级，其被配置为基于板参考电压产生屏幕参考电压，用于向每个五极管的屏幕栅格提供电压。 放大器还可以包括推挽输出级，其具有被配置为调整包括在级中的一对真空管中的一个中的控制偏置信号的伺服电路，直到该对管中的板电流基本相等。

公开(公告)号：US20050179496A1

公开(公告)日：2005-08-18

申请号：US11108815

申请日：2005-04-19

申请人： Katsuyuki Yasukouchi ,  Ayuko Watabe

发明人： Katsuyuki Yasukouchi ,  Ayuko Watabe

IPC分类号： H03F1/02 ,  H03F3/30 ,  H03F3/45 ,  H03F3/26

CPC分类号： H03F3/3067 ,  H03F3/45475 ,  H03F2203/30012

摘要： An operational amplifier that decreases idling current, widens a voltage output range, and increases load driving capacity. The operational amplifier includes a first output transistor connected to a high potential power supply. A second output transistor is connected between the first output transistor and a low potential power supply. The first and second output transistors generate an output signal at a node between the first output transistor and the second output transistor. An idling current control circuit controls the collector current of the first output transistor in accordance with the base voltage of the second output transistor to control the idling current of the first and second output transistors.

公开(公告)号：US20050174105A1

公开(公告)日：2005-08-11

申请号：US10776030

申请日：2004-02-10

申请人： Kunihiro Matsuura ,  Hiroki Ando ,  Hironori Tanaka ,  Yasuhiro Urabe ,  Satoshi Kodera

发明人： Kunihiro Matsuura ,  Hiroki Ando ,  Hironori Tanaka ,  Yasuhiro Urabe ,  Satoshi Kodera

IPC分类号： G01R1/00 ,  G01R31/28 ,  G01R31/319 ,  H03F1/34 ,  H03F3/30

CPC分类号： H03F3/3018 ,  G01R31/2851 ,  G01R31/31924 ,  H03F1/342

摘要： A testing apparatus includes a first power supply unit for generating a current to be supplied to the device under test and first and second coaxial cables through which the current generated by the first power supply unit is supplied to the device under test, wherein the first power supply unit includes a current detecting unit for detecting an amount of a voltage drop when the current generated by the first power supply unit passes through a predetermined resistor and a current controlling unit for controlling the current being supplied to the device under test in response to the amount of the voltage drop detected by the current detecting unit, the first coaxial cable includes a first internal conductor for conducting the current from the first power supply unit towards the device under test and a first external conductor provided around the first internal conductor with an insulator interposed therebetween for conducting the current from the device under test towards the first power supply unit, and the second coaxial cable includes a second internal conductor for conducting the current from the device under test towards the first power supply unit and a second external conductor around the first internal conductor with an insulator interposed therebetween for conducting the current from the first power supply unit towards the device under test.

摘要翻译： 测试装置包括：第一电源单元，用于产生要供给到被测器件的电流;以及第一和第二同轴电缆，由第一电源单元产生的电流通过该第一和第二同轴电缆提供给被测器件，其中第一功率 供电单元包括电流检测单元，用于当由第一电源单元产生的电流通过预定电阻器时检测电压降的量;以及电流控制单元，用于响应于所述电流控制单元控制供应给被测设备的电流 由电流检测单元检测的电压降的量，第一同轴电缆包括用于将来自第一电源单元的电流传导到被测器件的第一内部导体，以及设置在第一内部导体周围的第一外部导体，绝缘体 插入其间以将来自被测器件的电流传导到第一电源 r供电单元，并且第二同轴电缆包括用于将来自被测器件的电流传导到第一电源单元的第二内部导体，以及围绕第一内部导体的第二外部导体，其间插入绝缘体，用于将电流从 第一个供电单元朝向被测设备。

公开(公告)号：US20050168284A1

公开(公告)日：2005-08-04

申请号：US11099487

申请日：2005-04-06

申请人： Makoto Miura

发明人： Makoto Miura

IPC分类号： H03F3/45 ,  H03F3/30

CPC分类号： H03F3/303 ,  H03F2203/45454 ,  H03F2203/45466 ,  H03F2203/45471

摘要： An operational amplifier comprises: differential input stages to which differential signals can be inputted with full operating range; current source circuits coupled to determine current values of the differential input stages, phase inverter circuits which are provided between transistors of an output stage circuit and the current source circuits; a driver stage circuit and the output stage circuit. The phase inverter circuits control currents of the current source circuits depending on the output signal potential level. By using this structure, it becomes possible to realize a high slew rate throughout the full operating range.

摘要翻译： 运算放大器包括：差分输入级，差分信号可以在整个工作范围内被输入; 电流源电路耦合以确定差分输入级的电流值，在输出级电路的晶体管和电流源电路之间提供的相位逆变器电路; 驱动器级电路和输出级电路。 相位逆变器电路根据输出信号电位电平来控制电流源电路的电流。 通过使用这种结构，可以在整个工作范围内实现高压摆率。