公开(公告)号：US20130016087A1

公开(公告)日：2013-01-17

申请号：US13533374

申请日：2012-06-26

申请人： Teisuke Kishikawa

发明人： Teisuke Kishikawa

IPC分类号： G09G3/36 ,  G06F3/038 ,  H03F3/45

CPC分类号： H03F3/45183 ,  G09G3/3688 ,  G09G2310/0291 ,  H03F3/3022 ,  H03F2203/45466 ,  H03F2203/45471

摘要： Disclosed herein is an amplifier including a voltage follower circuit having differential input terminals and an output terminal fed back to a first one of the differential input terminals, the voltage follower circuit being configured to amplify an input signal inputted to a second one of the differential input terminals and output the amplified signal from the output terminal; a first current source configured to supply a predetermined current to the voltage follower circuit; and a second current source configured to supply current to the voltage follower circuit when a potential difference between the second one of the differential input terminals and the output terminal is equal to or higher than a predetermined value.

摘要翻译： 本文公开了一种放大器，包括具有差分输入端的电压跟随器电路和反馈到差分输入端中的第一个的输出端，该电压跟随器电路被配置为放大输入到第二差分输入端的输入信号 终端，并从输出端输出放大信号; 第一电流源，被配置为向所述电压跟随器电路提供预定电流; 以及第二电流源，被配置为当所述第二差分输入端子和所述输出端子之间的电位差等于或高于预定值时，向所述电压跟随器电路提供电流。

公开(公告)号：US07701291B2

公开(公告)日：2010-04-20

申请号：US11987923

申请日：2007-12-06

申请人： Wei-Che Chiu

发明人： Wei-Che Chiu

IPC分类号： H03F3/45

CPC分类号： H03F3/45183 ,  H03F2203/45248 ,  H03F2203/45344 ,  H03F2203/45466 ,  H03F2203/45471

摘要： A variable bias current is provided for the differential pair of an operational transconductance amplifier to improve the gain performance, especially to overcome the slew rate limit of the operational transconductance amplifier. The bias current is adjusted according to the differential input to the differential pair, the difference between the currents of the differential pair, or any one of the currents of the differential pair.

摘要翻译： 为运算跨导放大器的差分对提供可变偏置电流，以提高增益性能，特别是克服工作跨导放大器的转换速率极限。 偏置电流根据差分对的差分输入，差分对的电流差或差分对的任何一个电流进行调整。

公开(公告)号：US20100066436A1

公开(公告)日：2010-03-18

申请号：US12212486

申请日：2008-09-17

申请人： Chun C. Lee

发明人： Chun C. Lee

IPC分类号： H03K3/01

CPC分类号： H03F3/45183 ,  H03F1/0261 ,  H03F3/005 ,  H03F2203/45166 ,  H03F2203/45244 ,  H03F2203/45321 ,  H03F2203/45461 ,  H03F2203/45466 ,  H03F2203/45471 ,  H03F2203/45512 ,  H03F2203/45551 ,  H03F2203/45561 ,  H03F2203/45616 ,  H03F2203/45674

摘要： Exemplary embodiments of the disclosure include adaptively generating a bias current for a switched-capacitor circuit. An exemplary apparatus includes a first phase signal and a second phase signal operating at a sampling rate. An asserted time of the first phase signal and an asserted time of the second phase signal are separated by a predefined non-overlap time. The apparatus also includes a switched-capacitor circuit with a plurality of switched capacitors operably coupled to the first phase signal and the second phase signal. An amplifier is operably coupled to the switched-capacitor circuit and has a response time inversely proportional to an adaptive bias current. A bias generator is coupled to the amplifier and operates to modify the adaptive bias current responsive to the asserted time of the first phase signal.

摘要翻译： 本公开的示例性实施例包括自适应地产生开关电容器电路的偏置电流。 示例性装置包括以采样率操作的第一相位信号和第二相位信号。 第一相位信号的断言时间和第二相位信号的断言时间被隔开预定义的非重叠时间。 该装置还包括具有可操作地耦合到第一相位信号和第二相位信号的多个开关电容器的开关电容器电路。 放大器可操作地耦合到开关电容器电路并具有与自适应偏置电流成反比的响应时间。 偏置发生器耦合到放大器并且操作以响应于第一相位信号的断言时间来修改自适应偏置电流。

公开(公告)号：US07545213B2

公开(公告)日：2009-06-09

申请号：US11708053

申请日：2007-02-20

申请人： Hidenori Machida

发明人： Hidenori Machida

IPC分类号： H03F3/45

CPC分类号： H03F3/45475 ,  H03F3/45085 ,  H03F3/45098 ,  H03F3/45183 ,  H03F2200/321 ,  H03F2203/45466 ,  H03F2203/45471 ,  H03F2203/45496 ,  H03F2203/45528 ,  H03F2203/45646 ,  H03F2203/45692 ,  H03F2203/45696

摘要： An operational amplifier according to an embodiment of the invention includes: a control signal input terminal receiving a digital control signal from an external device; first and second transistors as a differential pair of a differential amplifier circuit; a constant current circuit supplying a predetermined current to the differential pair; a first resistor provided between the constant current circuit and the first transistor and involving a first potential difference; and a second resistor provided between the constant current circuit and the second transistor and involving a second potential difference, the operational amplifier changing a resistance value ratio between the first resistor and the second resistor in accordance with the control signal input to the control signal input terminal.

摘要翻译： 根据本发明实施例的运算放大器包括：控制信号输入端，其接收来自外部设备的数字控制信号; 第一和第二晶体管作为差分放大电路的差分对; 向所述差动对提供预定电流的恒流电路; 第一电阻器，设置在所述恒流电路和所述第一晶体管之间并且涉及第一电位差; 以及第二电阻器，设置在所述恒流电路和所述第二晶体管之间并且涉及第二电位差，所述运算放大器根据输入到所述控制信号输入端子的控制信号来改变所述第一电阻器和所述第二电阻器之间的电阻值比 。

公开(公告)号：US07492225B2

公开(公告)日：2009-02-17

申请号：US11781271

申请日：2007-07-22

申请人： Ming-Cheng Chiang

发明人： Ming-Cheng Chiang

IPC分类号： H03F3/45

CPC分类号： H03F3/45197 ,  H03F2203/45471 ,  H03F2203/45496 ,  H03F2203/45504 ,  H03F2203/45648 ,  H03G1/0029 ,  H03G1/0088

摘要： A gain-controlled amplifier is disclosed including: a set of switches; first and second transistors whose second terminals are coupled to each other via a resistive element; a first current mirror, coupled to a first terminal of the first transistor, for providing a set of first currents; a second current mirror, coupled to a first terminal of the second transistor, for providing a set of second currents; a first resistive network, coupled to the second terminal of the first transistor via a current source, for providing a first output signal; and a second resistive network, coupled to the second terminal of the second transistor via another current source, for providing a second output signal. Both the first and second resistive networks have a plurality of taps, coupling to either a first current or a second current through a switch of the set of switches.

摘要翻译： 公开了一种增益控制放大器，包括：一组开关; 第一和第二晶体管，其第二端子经由电阻元件彼此耦合; 第一电流镜，耦合到第一晶体管的第一端，用于提供一组第一电流; 第二电流镜，耦合到所述第二晶体管的第一端，用于提供一组第二电流; 第一电阻网络，经由电流源耦合到第一晶体管的第二端子，用于提供第一输出信号; 以及第二电阻网络，其经由另一个电流源耦合到第二晶体管的第二端子，用于提供第二输出信号。 第一和第二电阻网络都具有多个抽头，其耦合到通过该组开关的开关的第一电流或第二电流。

公开(公告)号：US20080106335A1

公开(公告)日：2008-05-08

申请号：US11905483

申请日：2007-10-01

申请人： Katsuji Kimura

发明人： Katsuji Kimura

IPC分类号： H03F3/45 ,  G06G7/12

CPC分类号： H03F3/45197 ,  H03F1/3211 ,  H03F3/45183 ,  H03F3/45188 ,  H03F3/45632 ,  H03F2203/45024 ,  H03F2203/45062 ,  H03F2203/45318 ,  H03F2203/45352 ,  H03F2203/45354 ,  H03F2203/45356 ,  H03F2203/45366 ,  H03F2203/45454 ,  H03F2203/45471 ,  H03F2203/45644 ,  H03F2203/45648 ,  H03F2203/45652

摘要： Disclosed is a differential circuit including a first transistor pair including first and second transistors having gates for receiving a differential input signal; a second transistor pair including third and fourth transistors having gates for commonly receiving a common mode voltage of the differential input signal, having drains connected to drains of said first and second transistors, respectively, and having sources coupled together; a third transistor pair including fifth and sixth transistors having gates for receiving the differential input signal, and cascode-connected to said third and fourth transistors, respectively; and a fourth transistor pair including seventh and eighth transistors having gates for receiving the differential input signal in reverse phase, and cascode-connected to said fifth and sixth transistors, respectively; wherein coupled drains of the first and third transistors and coupled drains of the second and fourth transistors constitute a differential output pair; and sources of said first, second, seventh and eighth transistors are coupled together and driven by a constant current source.

摘要翻译： 公开了一种包括第一晶体管对的差分电路，其包括具有用于接收差分输入信号的栅极的第一和第二晶体管; 第二晶体管对，其包括具有用于共同接收所述差分输入信号的共模电压的栅极的第三和第四晶体管，具有分别连接到所述第一和第二晶体管的漏极并具有耦合在一起的源极的漏极; 包括第五和第六晶体管的第三晶体管对，其具有用于接收所述差分输入信号的栅极，并且分别与所述第三和第四晶体管连接; 以及包括第七和第八晶体管的第四晶体管对，其具有用于以相反相接收差分输入信号的栅极，并且分别与所述第五和第六晶体管连接; 其中所述第一和第三晶体管的耦合漏极和所述第二和第四晶体管的耦合漏极构成差分输出对; 并且所述第一，第二，第七和第八晶体管的源极耦合在一起并由恒定电流源驱动。

公开(公告)号：US07342452B2

公开(公告)日：2008-03-11

申请号：US11162728

申请日：2005-09-21

申请人： Kuang-Feng Sung ,  Yueh-Hsiu Liu ,  Wei-Ta Chiu

发明人： Kuang-Feng Sung ,  Yueh-Hsiu Liu ,  Wei-Ta Chiu

IPC分类号： H03F3/45

CPC分类号： H03F3/45183 ,  H03F2203/45244 ,  H03F2203/45454 ,  H03F2203/45471 ,  H03F2203/45476 ,  H03F2203/45504

摘要： A control circuit for an operational amplifier and a method thereof are provided to dynamically modulate the operational amplifier for strong driving capability and power saving. The control circuit comprises a bias unit coupled to the operational amplifier and a control unit coupled to the bias unit. The bias unit normally outputs a bias signal to bias the operational amplifier so that the operational amplifier has a first driving capability. However, when the driving capability of the operational amplifier needs to be adjusted, the control unit receives a modulating signal and outputs a control signal according to the modulating signal. When the bias unit receives the control signal, the bias unit dynamically modulates the bias signal according to the control signal, and hence the driving capability of the operational amplifier is dynamically modulated in an indirect manner.

摘要翻译： 提供了一种运算放大器的控制电路及其方法，以动态调制运算放大器，具有较强的驱动能力和省电功能。 控制电路包括耦合到运算放大器的偏置单元和耦合到偏压单元的控制单元。 偏置单元通常输出偏置信号以偏置运算放大器，使得运算放大器具有第一驱动能力。 然而，当需要调整运算放大器的驱动能力时，控制单元接收调制信号并根据调制信号输出控制信号。 当偏置单元接收到控制信号时，偏置单元根据控制信号动态地调制偏置信号，因此运算放大器的驱动能力以间接方式动态调制。

公开(公告)号：US20060238249A1

公开(公告)日：2006-10-26

申请号：US11162728

申请日：2005-09-21

申请人： Kuang-Feng Sung ,  Yueh-Hsiu Liu ,  Wei-Ta Chiu

发明人： Kuang-Feng Sung ,  Yueh-Hsiu Liu ,  Wei-Ta Chiu

IPC分类号： H03F3/45

CPC分类号： H03F3/45183 ,  H03F2203/45244 ,  H03F2203/45454 ,  H03F2203/45471 ,  H03F2203/45476 ,  H03F2203/45504

摘要： A control circuit for an operational amplifier and a method thereof are provided to dynamically modulate the operational amplifier for strong driving capability and power saving. The control circuit comprises a bias unit coupled to the operational amplifier and a control unit coupled to the bias unit. The bias unit normally outputs a bias signal to bias the operational amplifier so that the operational amplifier has a first driving capability. However, when the driving capability of the operational amplifier needs to be adjusted, the control unit receives a modulating signal and outputs a control signal according to the modulating signal. When the bias unit receives the control signal, the bias unit dynamically modulates the bias signal according to the control signal, and hence the driving capability of the operational amplifier is dynamically modulated in an indirect manner.

摘要翻译： 提供了一种运算放大器的控制电路及其方法，以动态调制运算放大器，具有较强的驱动能力和省电功能。 控制电路包括耦合到运算放大器的偏置单元和耦合到偏置单元的控制单元。 偏置单元通常输出偏置信号以偏置运算放大器，使得运算放大器具有第一驱动能力。 然而，当需要调整运算放大器的驱动能力时，控制单元接收调制信号并根据调制信号输出控制信号。 当偏置单元接收到控制信号时，偏置单元根据控制信号动态地调制偏置信号，因此运算放大器的驱动能力以间接方式动态调制。

公开(公告)号：US20060001486A1

公开(公告)日：2006-01-05

申请号：US11214670

申请日：2005-08-29

申请人： Kevin Glass

发明人： Kevin Glass

IPC分类号： H03G3/20

CPC分类号： H03F3/45089 ,  H03F1/30 ,  H03F2203/45298 ,  H03F2203/45316 ,  H03F2203/45392 ,  H03F2203/45471 ,  H03F2203/45668 ,  H03F2203/45722

摘要： A method and apparatus to bias each of a plurality of stages of a limiting amplifier are described.

摘要翻译： 描述了偏置限幅放大器的多个级中的每一个的方法和装置。

公开(公告)号：US20050134390A1

公开(公告)日：2005-06-23

申请号：US10739382

申请日：2003-12-17

申请人： Kevin Glass

发明人： Kevin Glass

IPC分类号： H03F1/30 ,  H03F3/45 ,  H03F1/22

CPC分类号： H03F3/45089 ,  H03F1/30 ,  H03F2203/45298 ,  H03F2203/45316 ,  H03F2203/45392 ,  H03F2203/45471 ,  H03F2203/45668 ,  H03F2203/45722

摘要： A method and apparatus to bias each of a plurality of stages of a limiting amplifier are described.

摘要翻译： 描述了偏置限幅放大器的多个级中的每一个的方法和装置。