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    Bias adjustment circuitry for balanced amplifiers
    4.
    发明授权
    Bias adjustment circuitry for balanced amplifiers 有权
    用于平衡放大器的偏置调整电路

    公开(公告)号：US09595927B2

    公开(公告)日：2017-03-14

    申请号：US14461905

    申请日：2014-08-18

    申请人： Cree, Inc.

    发明人： Kyle Baker

    IPC分类号： H03F3/68 ,  H03F1/02 ,  H03F1/56 ,  H03F3/19 ,  H03F3/195 ,  H04B1/04 ,  H03F3/60

    CPC分类号： H03F1/56 ,  H03F1/0261 ,  H03F3/195 ,  H03F3/602 ,  H03F2200/192 ,  H03F2200/198 ,  H03F2200/204 ,  H03F2200/222 ,  H03F2200/24 ,  H03F2200/387 ,  H03F2200/408 ,  H03F2200/451 ,  H03F2200/555 ,  H04B1/0475

    摘要： Circuitry includes a balanced amplifier and bias adjustment circuitry. The bias adjustment circuitry is coupled to the balanced amplifier and is configured to measure an RF termination voltage across an output termination impedance of the balanced amplifier and adjust a bias voltage supplied to the balanced amplifier based on the RF termination voltage. Notably, the RF termination voltage is proportional to a voltage standing wave ratio (VSWR) of the balanced amplifier, and thus enables an accurate measurement thereof. By using the RF termination voltage to adjust a bias voltage supplied to the balanced amplifier, overvoltage and/or thermally stressing conditions of the balanced amplifier as a result of high VSWR may be avoided while simultaneously avoiding the need for large or expensive isolation circuitry.

    摘要翻译： 电路包括平衡放大器和偏置调整电路。 偏置调整电路耦合到平衡放大器，并且被配置为测量跨平衡放大器的输出端接阻抗的RF终端电压，并根据RF终端电压调整提供给平衡放大器的偏置电压。 值得注意的是，RF终端电压与平衡放大器的电压驻波比（VSWR）成比例，因此能够进行准确的测量。 通过使用RF终端电压来调节提供给平衡放大器的偏置电压，可以避免由于高VSWR而导致的平衡放大器的过压和/或热应力条件，同时避免对大型或昂贵的隔离电路的需要。

    LOW NOISE AMPLIFIER FOR MEMS CAPACITIVE TRANSDUCERS
    6.
    发明申请
    LOW NOISE AMPLIFIER FOR MEMS CAPACITIVE TRANSDUCERS 有权
    用于MEMS电容式传感器的低噪声放大器

    公开(公告)号：US20150318829A1

    公开(公告)日：2015-11-05

    申请号：US14700666

    申请日：2015-04-30

    申请人： Cirrus Logic International Semiconductor Ltd.

    发明人： Santosh Astgimath

    IPC分类号： H03F1/26 ,  H04R3/00 ,  H03F3/183

    CPC分类号： H03F3/505 ,  H03F1/0205 ,  H03F1/26 ,  H03F3/183 ,  H03F3/187 ,  H03F2200/03 ,  H03F2200/129 ,  H03F2200/15 ,  H03F2200/24 ,  H03F2200/294 ,  H03G1/0088 ,  H04R3/00 ,  H04R19/005 ,  H04R19/04 ,  H04R2201/003

    摘要： This application relates to amplifier circuitry for amplifying a signal from a MEMS transducer. A super source follower circuit (40) is provided which includes a feedback path from its output node (Nout) to a control bias node (BC) in order to provide a preamplifier signal gain that may be greater than unity. A first transistor (M1) is configured to have its gate node connected to an input node (NIN) for receiving the input signal (VIN) and its drain node connected to an input node (X) of an output stage (A). The source node of the first transistor is connected to the output node (NOUT). A current source (I2) is configured to deliver a current to the drain node of the first transistor (M1), wherein the current source (I2) is controlled by a bias control voltage (VBC) at the bias control node (BC). A feedback impedance network (Z1) comprising a first port connected to the output node (NOUT) and a second port connected to the bias control node (BC) is provided.

    摘要翻译： 本申请涉及用于放大来自MEMS换能器的信号的放大器电路。 提供了超源跟随器电路（40），其包括从其输出节点（Nout）到控制偏置节点（BC）的反馈路径，以便提供可以大于1的前置放大器信号增益。 第一晶体管（M1）被配置为使其栅极节点连接到输入节点（NIN），用于接收连接到输出级（A）的输入节点（X）的输入信号（VIN）及其漏极节点。 第一晶体管的源节点连接到输出节点（NOUT）。 电流源（I2）被配置为将电流传送到第一晶体管（M1）的漏极节点，其中电流源（I2）由偏置控制节点（BC）处的偏置控制电压（VBC）控制。 提供了包括连接到输出节点（NOUT）的第一端口和连接到偏置控制节点（BC）的第二端口的反馈阻抗网络（Z1）。

    Amplifier circuit having dynamically biased configuration
    9.
    发明申请
    Amplifier circuit having dynamically biased configuration 有权
    具有动态偏置配置的放大器电路

    公开(公告)号：US20090289716A1

    公开(公告)日：2009-11-26

    申请号：US12154648

    申请日：2008-05-23

    申请人： Kent Jaeger ,  Lawrence E. Connell

    发明人： Kent Jaeger ,  Lawrence E. Connell

    IPC分类号： H03F3/45

    CPC分类号： H03F1/0272 ,  H03F3/195 ,  H03F3/45183 ,  H03F2200/24 ,  H03F2200/451 ,  H03F2203/45271 ,  H03F2203/45292 ,  H03F2203/45322 ,  H03F2203/45581 ,  H03F2203/45612

    摘要： Methods and corresponding systems for amplifying an input signal include inputting first and second differential input signals into first and second circuit legs, respectively, wherein the first circuit leg includes a first transistor coupled in series with a first variable current source, and wherein the second circuit leg includes a second transistor coupled in series with a second variable current source. The first and second variable current sources are dynamically set to provide first and second bias currents in response to the first and second differential input signals, wherein the first bias current is set inversely proportional to the second bias current. The first and second bias currents are sunk in the first and second circuit legs, respectively. First and second differential output signals are output from the first and second circuit legs, respectively.

    摘要翻译： 用于放大输入信号的方法和相应系统包括分别将第一和第二差分输入信号输入到第一和第二电路支路，其中第一电路支路包括与第一可变电流源串联耦合的第一晶体管，并且其中第二电路 腿包括与第二可变电流源串联耦合的第二晶体管。 动态地设置第一和第二可变电流源以响应于第一和第二差分输入信号提供第一和第二偏置电流，其中第一偏置电流与第二偏置电流成反比地设定。 第一和第二偏置电流分别在第一和第二电路支路中沉没。 第一和第二差分输出信号分别从第一和第二电路支路输出。

    Rail-to-rail source followers
    10.
    发明授权
    Rail-to-rail source followers 有权
    铁路到铁路的追随者

    公开(公告)号：US07208974B1

    公开(公告)日：2007-04-24

    申请号：US11142176

    申请日：2005-05-31

    申请人： Siew Yong Chui

    发明人： Siew Yong Chui

    IPC分类号： H03K19/003 ,  H03K17/16

    CPC分类号： H03K19/01721 ,  H03F1/301 ,  H03F3/347 ,  H03F3/505 ,  H03F2200/24 ,  H03F2203/5027 ,  H03K19/018521

    摘要： Circuits and methods are provided for producing a rail-to-rail output voltage. A circuit includes a level shifter, a source follower, and a current compensation circuit. The level shifter receives an input signal and applies a compensation voltage to the input signal relative to a voltage level of the input signal in steady-state. The source follower produces an output signal and, responsive to variations in the voltage level of the input signal, changes the voltage level of the output signal using a biasing current. The current compensation circuit, responsive to a difference between the voltage levels of the input and output signals, varies an amount of the biasing current.

    摘要翻译： 电路和方法用于产生轨到轨输出电压。 电路包括电平移位器，源极跟随器和电流补偿电路。 电平移位器接收输入信号，并相对于输入信号在稳态的电压电平向输入信号施加补偿电压。 源极跟随器产生输出信号，并且响应于输入信号的电压电平的变化，使用偏置电流来改变输出信号的电压电平。 电流补偿电路响应于输入和输出信号的电压电平之差，改变偏置电流的量。