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    Reducing Noise and Distortion in a Receiver System
    1.
    发明申请
    Reducing Noise and Distortion in a Receiver System 有权
    降低接收机系统的噪声和失真

    公开(公告)号：US20060068741A1

    公开(公告)日：2006-03-30

    申请号：US10711680

    申请日：2004-09-30

    Applicant: Anant KAMATH ,  Gaurav CHANDRA ,  Prakash EASWARAN

    Inventor： Anant KAMATH ,  Gaurav CHANDRA ,  Prakash EASWARAN

    IPC: H04B1/10

    CPC classification number: H04B1/30 ,  H03F1/26 ,  H03F1/3211 ,  H03F3/45183 ,  H03F3/45475 ,  H03F2200/294 ,  H03F2203/45136 ,  H03F2203/45526

    Abstract: A receiver, implemented with low noise and low distortion, to process an input signal containing signals of interest and unwanted interference signal. In an embodiment, the receiver contains a mixer which generates an intermediate signal in the form of an electric current, and a filter which filters the unwanted interference signals from the intermediate signal. The intermediate signal is centered around a lower frequency compared to a crier frequency of the input signal. Due to the current mode interface between the mixer and the filter circuit, low noise and low distortion may be attended.

    Abstract translation: 以低噪声和低失真实现的接收机，用于处理包含感兴趣信号和不想要的干扰信号的输入信号。 在一个实施例中，接收机包含以电流形式产生中间信号的混频器和从中间信号滤除不想要的干扰信号的滤波器。 与输入信号的频率相比，中间信号以较低频率为中心。 由于混频器和滤波电路之间的电流模式接口，可能会出现低噪声和低失真。

    HIGH ORDER TRANS-IMPEDANCE FILTER WITH A SINGLE OPERATIONAL AMPLIFIER
    2.
    发明申请
    HIGH ORDER TRANS-IMPEDANCE FILTER WITH A SINGLE OPERATIONAL AMPLIFIER 有权
    具有单操作功能的高级防转移过滤器

    公开(公告)号：US20060068742A1

    公开(公告)日：2006-03-30

    申请号：US10711724

    申请日：2004-09-30

    Applicant: Gaurav CHANDRA ,  Preetam TADEPARTHY ,  Prakash EASWARAN

    Inventor： Gaurav CHANDRA ,  Preetam TADEPARTHY ,  Prakash EASWARAN

    IPC: H04B1/18 ,  H04B1/10

    CPC classification number: H03H11/126 ,  H04B1/16

    Abstract: A trans-impedance filter circuit provided according to an aspect of the present invention contains an operational amplifier, a first resistor, a first capacitor, a second resistor, and a second capacitor. The second capacitor is connected in parallel between the inverting input terminal and an output path of the operational amplifier. The second resistor is connected between the output terminal of the operational amplifier and a second node on a path connecting the input signal to the inverting input terminal. The first resistor is coupled between the first node and inverting input terminal of the operational amplifier. The first capacitor is coupled between the first node and Vss. Due to such connections, the filter circuit operates as a second order filter circuit, thereby providing a desired high level of filtering. Also, as the filter circuit is implemented with a single operational amplifier, the power and area requirements are reduced.

    Abstract translation: 根据本发明一方面提供的跨阻抗滤波器电路包括运算放大器，第一电阻器，第一电容器，第二电阻器和第二电容器。 第二电容器并联连接在反相输入端和运算放大器的输出路径之间。 第二电阻器连接在运算放大器的输出端和将输入信号连接到反相输入端的路径上的第二节点之间。 第一电阻耦合在运算放大器的第一节点和反相输入端之间。 第一电容器耦合在第一节点和Vss之间。 由于这种连接，滤波器电路作为二阶滤波器电路工作，从而提供期望的高级滤波。 而且，由于滤波器电路由单个运算放大器实现，所以功率和面积要求降低。

    FILTER CIRCUIT PROVIDING LOW DISTORTION AND ENHANCED FLEXIBILITY TO OBTAIN VARIABLE GAIN AMPLIFICATION
    3.
    发明申请
    FILTER CIRCUIT PROVIDING LOW DISTORTION AND ENHANCED FLEXIBILITY TO OBTAIN VARIABLE GAIN AMPLIFICATION 有权
    提供低失真的滤波电路和增强灵敏度以获得可变增益放大

    公开(公告)号：US20060103469A1

    公开(公告)日：2006-05-18

    申请号：US10904578

    申请日：2004-11-17

    Applicant: Gaurav CHANDRA ,  Prakash EASWARAN ,  Sumantra SETH

    Inventor： Gaurav CHANDRA ,  Prakash EASWARAN ,  Sumantra SETH

    IPC: H03F3/191

    CPC classification number: H03F1/34 ,  H03G3/3052 ,  H03G5/24 ,  H03H11/126 ,  H03H11/1291

    Abstract: A low distortion filter circuit implementing variable gain amplification (VGA). An aspect of the present invention increases the degrees of freedom (number of components which can be independently programmed/changed to corresponding desired values) to achieve a desired combination of D.C. gain and filter characteristics (e.g., corner frequency, Q-factor, notch frequency, etc.). Such additional degrees of freedom are attained by including additional components in either an input block or a feedback block (implemented with reference to an operational amplifier), and by redesigning the other block using principles such as admittance cancellation to remove the effects of such additional components. The blocks are designed such that a terminal of the programmable components is connected to a fixed/constant voltage (e.g., ground). Embodiments implementing bi-quad single amplifier with and without notch are disclosed.

    Abstract translation: 实现可变增益放大（VGA）的低失真滤波电路。 本发明的一个方面增加了自由度（可以被独立地编程/改变为相应的期望值的分量的数量），以实现期望的DC增益和滤波器特性的组合（例如，转角频率，Q因子，陷波频率 等）。 这样的附加自由度通过将附加组件包括在输入块或反馈块（参考运算放大器实现）中来实现，并且通过使用诸如导纳消除之类的原理重新设计其他块来消除这些附加组件的影响 。 这些块被设计成使得可编程组件的端子连接到固定/恒定电压（例如，接地）。 公开了实现具有和没有陷波的双二极管单放大器的实施例。

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