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    Reciprocal mixing noise cancellation in the presence of a modulated blocker
    21.
    发明授权
    Reciprocal mixing noise cancellation in the presence of a modulated blocker 有权
    在存在调制阻滞剂的情况下进行交互混合噪声消除

    公开(公告)号：US08862087B2

    公开(公告)日：2014-10-14

    申请号：US13897306

    申请日：2013-05-17

    Applicant: Broadcom Corporation

    Inventor： Mohyee Mikhemar ,  David Murphy ,  Hooman Darabi

    IPC: H04B1/10

    CPC classification number: H04B15/06 ,  H04B1/109

    Abstract: A method for reciprocal-mixing noise cancellation may include receiving, from a first mixer, a first signal comprising a wanted signal at a first frequency and a modulated signal at a second frequency. The modulated signal may be a product of a reciprocal-mixing of an unwanted signal with a phase noise. One or more portions of the modulated signal may overlap the wanted signal, adding a reciprocal-mixing noise to the wanted signal. A second signal may be generated by mixing, at a second mixer, the first signal with a third signal, which is at a third frequency related to a blocker offset frequency. A gain may be applied to the second signal to generate an amplified second signal that may be subtracted from the first signal to generate a fourth signal. The fourth signal may be filtered to generate the wanted signal at the first frequency without the reciprocal-mixing noise.

    Abstract translation: 用于相互混合噪声消除的方法可以包括从第一混频器接收包括第一频率的有用信号的第一信号和以第二频率调制的信号。 调制信号可以是不想要的信号与相位噪声的互相混合的乘积。 调制信号的一个或多个部分可能与有用信号重叠，向有用信号添加互易混合噪声。 第二信号可以通过在第二混合器处将第一信号与第三信号混合来产生，第三信号是与阻塞偏移频率相关的第三频率。 可以将增益应用于第二信号以产生可以从第一信号中减去的放大的第二信号，以产生第四信号。 可以对第四信号进行滤波，以在第一频率下产生有用信号，而不会产生相互混合噪声。

    Using direct phase noise measurement and blocker recovery to cancel reciprocal mixing noise
    22.
    发明授权
    Using direct phase noise measurement and blocker recovery to cancel reciprocal mixing noise 有权
    使用直接相位噪声测量和阻塞恢复来消除相互混合噪声

    公开(公告)号：US08824988B2

    公开(公告)日：2014-09-02

    申请号：US13681333

    申请日：2012-11-19

    Applicant: Broadcom Corporation

    Inventor： Mohyee Mikhemar ,  David Murphy ,  Hooman Darabi

    IPC: H04B17/00 ,  H04B1/10

    CPC classification number: H04B1/1027

    Abstract: A method for reciprocal-mixing noise cancellation may include receiving a baseband signal down-converted to baseband using a local oscillator (LO). The baseband signal may comprise a wanted signal and a reciprocal mixing noise, which at least partially overlaps the wanted signal and is due to mixing of a blocker signal with a phase noise of the LO. Blocker recovery may be performed on the baseband signal and a blocker estimate signal may be generated from the baseband signal. The phase noise of the LO may be measured and used in generating a phase noise measurement signal. The blocker estimate signal and the phase noise measurement signal may be processed to generate a reconstructed noise signal that may comprise the overlapping reciprocal mixing noise. The reconstructed noise signal may be subtracted from the baseband signal to provide the wanted signal free from to the reciprocal mixing noise.

    Abstract translation: 用于相互混合噪声消除的方法可以包括使用本地振荡器（LO）接收被下变频到基带的基带信号。 基带信号可以包括有用信号和互易混合噪声，其与有用信号至少部分重叠，并且是由于阻塞信号与LO的相位噪声的混合引起的。 可以对基带信号执行阻塞恢复，并且可以从基带信号生成阻塞估计信号。 可以测量LO的相位噪声并用于产生相位噪声测量信号。 阻塞估计信号和相位噪声测量信号可以被处理以产生重构的噪声信号，其可以包括重叠的互倒混合噪声。 可以从基带信号中减去重建的噪声信号，以提供不需要的混合噪声的有用信号。

    Low-Power Receiver
    23.
    发明申请
    Low-Power Receiver 有权
    低功耗接收机

    公开(公告)号：US20130267183A1

    公开(公告)日：2013-10-10

    申请号：US13906928

    申请日：2013-05-31

    Applicant: Broadcom Corporation

    Inventor： Mohyee Mikhemar ,  Hooman Darabi ,  Masoud Kahrizi

    IPC: H04B1/16

    CPC classification number: H04B1/16 ,  H04B1/18 ,  H04B1/30

    Abstract: According to one embodiment, a compact low-power receiver comprises a front-end producing a front-end gain and a back-end producing a back-end gain. The front-end includes a transconductance amplifier providing digital gain control and outputting an amplified receive signal, a mixer for generating a down-converted signal from the amplified receive signal, and a transimpedance amplifier (TIA) including a current mode buffer. The TIA provides gain control for amplifying the down-converted signal to produce a front-end output signal. In one embodiment, the back end includes a second-order low-pass filter to produce a filtered signal from the front-end output signal and an analog-to-digital converter (ADC), wherein the filtered signal is fed directly to the ADC without direct-current (DC) offset cancellation being performed. In various embodiments, the front-end gain is substantially greater than the back-end gain.

    Abstract translation: 根据一个实施例，紧凑型低功率接收机包括产生前端增益的前端和产生后端增益的后端。 前端包括提供数字增益控制和输出放大的接收信号的跨导放大器，用于从放大的接收信号产生下变频信号的混频器，以及包括电流模式缓冲器的跨阻抗放大器（TIA）。 TIA提供用于放大下变频信号以产生前端输出信号的增益控制。 在一个实施例中，后端包括从前端输出信号产生滤波信号的二阶低通滤波器和模数转换器（ADC），其中滤波后的信号被直接馈送到ADC 没有执行直流（DC）偏移消除。 在各种实施例中，前端增益基本上大于后端增益。

    Receiver with Variable Gain Control Transimpedance Amplifier
    24.
    发明申请
    Receiver with Variable Gain Control Transimpedance Amplifier 有权
    具有可变增益控制互阻放大器的接收器

    公开(公告)号：US20130259172A1

    公开(公告)日：2013-10-03

    申请号：US13901390

    申请日：2013-05-23

    Applicant: Broadcom Corporation

    Inventor： Mohyee Mikhemar ,  Amir Hadji-Abdolhamid ,  Hooman Darabi

    IPC: H03G3/32

    CPC classification number: H03H11/1217 ,  H03F1/0205 ,  H03F1/086 ,  H03F3/19 ,  H03F3/45076 ,  H03F2200/294 ,  H03F2200/451 ,  H03F2200/91 ,  H03F2203/45332 ,  H03F2203/45336 ,  H03G1/0005 ,  H03G1/0029 ,  H03G3/3068 ,  H03G3/32 ,  H03H11/1252 ,  H03H11/1256 ,  H03H11/1291 ,  H03H2210/025 ,  H04B1/123 ,  H04B1/16 ,  H04L25/06

    Abstract: According to one embodiment, a compact low-power receiver comprises first and second analog circuits connected by a digitally controlled interface circuit. The first analog circuit has a first direct-current (DC) offset and a first common mode voltage at an output, and the second analog circuit has a second DC offset and a second common mode voltage at an input. The digitally controlled interface circuit connects the output to the input, and is configured to match the first and second DC offsets and to match the first and second common mode voltages. In one embodiment, the first analog circuit is a variable gain control transimpedance amplifier (TIA) implemented using a current mode buffer, the second analog circuit is a second-order adjustable low-pass filter, whereby a three-pole adjustable low-pass filter in the compact low-power receiver is effectively produced.

    Abstract translation: 根据一个实施例，紧凑型低功率接收机包括由数字控制接口电路连接的第一和第二模拟电路。 第一模拟电路在输出处具有第一直流（DC）偏移和第一共模电压，并且第二模拟电路在输入端具有第二直流偏移和第二共模电压。 数字控制接口电路将输出连接到输入，并且被配置为匹配第一和第二DC偏移并且匹配第一和第二共模电压。 在一个实施例中，第一模拟电路是使用电流模式缓冲器实现的可变增益控制跨阻抗放大器（TIA），第二模拟电路是二阶可调低通滤波器，由此三极可调低通滤波器 在紧凑型低功率接收机中有效生产。

    Method and system for low-noise, highly-linear receiver front-end
    28.
    发明授权
    Method and system for low-noise, highly-linear receiver front-end 有权
    低噪声，高线性接收机前端的方法和系统

    公开(公告)号：US09031529B2

    公开(公告)日：2015-05-12

    申请号：US13863057

    申请日：2013-04-15

    Applicant: Broadcom Corporation

    Inventor： David Murphy ,  Ahmad Mirzaei ,  Mohyee Mikhemar ,  Hooman Darabi

    IPC: H04B1/26 ,  H04B1/16 ,  H04B1/30

    CPC classification number: H04B1/16 ,  H04B1/30

    Abstract: Aspects of a method and system for a low-noise, highly-linear receiver front-end are provided. In this regard, a received signal may be processed via one or more transconductances, one or more transimpedance amplifiers (TIAs), and one or more mixers to generate a first baseband signal corresponding to a voltage at a node of the receiver, and a second baseband signal corresponding to a current at the node of the receiver. The first signal and the second signal may be processed to recover information from the received signal. The first signal may be generated via a first one or more signal paths of the receiver and the second signal may be generated via a second one or more signal paths of the receiver.

    Abstract translation: 提供了一种用于低噪声，高线性接收机前端的方法和系统。 在这方面，可以经由一个或多个跨导，一个或多个跨阻抗放大器（TIAs）和一个或多个混频器来处理接收的信号，以产生对应于接收机的节点处的电压的第一基带信号，以及第二 对应于接收机节点处的电流的基带信号。 可以处理第一信号和第二信号以从接收的信号中恢复信息。 可以经由接收机的第一个或多个信号路径生成第一信号，并且可以经由接收机的第二个一个或多个信号路径来生成第二信号。

    Low-loss TX-to-RX isolation using electrical balance duplexer with noise cancellation
    29.
    发明授权
    Low-loss TX-to-RX isolation using electrical balance duplexer with noise cancellation 有权
    使用具有噪声消除功能的电气平衡双工器进行低损耗TX-to-RX隔离

    公开(公告)号：US09000860B2

    公开(公告)日：2015-04-07

    申请号：US13719055

    申请日：2012-12-18

    Applicant: Broadcom Corporation

    Inventor： Mohyee Mikhemar ,  Hooman Darabi

    IPC: H03H7/46 ,  H04B1/48

    CPC classification number: H04B15/00 ,  H04B1/123 ,  H04B1/48 ,  H04B1/525 ,  H04L5/14

    Abstract: A circuit for a low-loss electrical balance duplexer (EBD) with noise cancellation may include an EBD circuit. The EBD circuit may be coupled to one or more output nodes of a transmit (TX) path, an antenna, and a one or more input nodes of a receive (RX) path. The EBD circuit may be configured to isolate the TX path from the RX path, and to provide low-loss signal paths between the one or more output nodes of the TX path and the antenna. A balancing network may be coupled to the EBD circuit and configured to provide an impedance that matches an impedance associated with the antenna. A noise cancellation circuit may be configured to sense a noise signal generated by the balancing network, and to use the sensed noise signal to improve a signal-to-noise ratio (SNR) of the RX path.

    Abstract translation: 用于具有噪声消除的低损耗电气平衡双工器（EBD）的电路可以包括EBD电路。 EBD电路可以耦合到发射（TX）路径，天线和接收（RX）路径的一个或多个输入节点的一个或多个输出节点。 EBD电路可以被配置为将TX路径与RX路径隔离，并且在TX路径的一个或多个输出节点和天线之间提供低损耗信号路径。 平衡网络可以耦合到EBD电路并且被配置为提供匹配与天线相关联的阻抗的阻抗。 噪声消除电路可以被配置为感测由平衡网络产生的噪声信号，并且使用所感测的噪声信号来提高RX路径的信噪比（SNR）。

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