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    RF TRANSFORMER BASED TX/RX INTEGRATED RF SWITCH
    24.
    发明申请
    RF TRANSFORMER BASED TX/RX INTEGRATED RF SWITCH 有权
    基于射频变压器的TX / RX集成式RF开关

    公开(公告)号：US20150333791A1

    公开(公告)日：2015-11-19

    申请号：US14277427

    申请日：2014-05-14

    Applicant: DSP Group, Ltd.

    Inventor： Sergey Anderson ,  Sharon Betzalel

    IPC: H04B1/48

    CPC classification number: H04B1/44 ,  H04B1/48

    Abstract: The present invention is a novel and useful RF transformer based transmit/receive (TX/RX) integrated RF switch. In one embodiment of the invention, the TX/RX RF switch circuit is based on the use of an RF transformer which functions as (1) the PA output transformer during TX mode and (2) as a series inductance in an LNA matching network during receive mode. Thus, the RF transformer plays a dual function or role. Antenna diversity is achieved by having multiple antennas each having an associated antenna switch connected to the output transformer. The TX/RX switch of the invention reduces the number of switches required for antenna diversity to a minimum and minimizes RF losses in the system. The TX/RX switch is suitable for use with modern wireless communication standards such as DECT, 802.11 WLAN, Bluetooth, ZigBee, etc. The configuration of the TX/RX circuit permits the use of common, relatively low cost semiconductor fabrication techniques such as standard CMOS processes.

    Abstract translation: 本发明是一种新颖且有用的基于RF变压器的发射/接收（TX / RX）集成RF开关。 在本发明的一个实施例中，TX / RX RF开关电路基于使用RF变压器，其在TX模式期间用作（1）PA输出变压器，以及（2）作为LNA匹配网络中的串联电感 接收模式。 因此，RF变压器具有双重功能或作用。 通过将多个天线各自具有连接到输出变压器的相关联的天线开关来实现天线分集。 本发明的TX / RX开关将天线分集所需的开关数量减少到最小，并使系统中的RF损耗最小化。 TX / RX开关适用于现代无线通信标准，如DECT，802.11 WLAN，蓝牙，ZigBee等。TX / RX电路的配置允许使用常见的，相对较低成本的半导体制造技术，如标准 CMOS工艺。

    TRANSMIT RECEIVE RADIO FREQUENCY SWITCH
    26.
    发明申请
    TRANSMIT RECEIVE RADIO FREQUENCY SWITCH 有权

    公开(公告)号：US20210266032A1

    公开(公告)日：2021-08-26

    申请号：US17140301

    申请日：2021-01-04

    Applicant: DSP Group Ltd.

    Inventor： Sergey Anderson ,  Nadav SNIR

    IPC: H04B1/44 ,  H03K17/693

    Abstract: A TX/RX RF switch that may include a reception path; and a transmission path that has an antenna port, a transmission input port, and transmission transistors. The transmission transistors have source-bulk connections. The reception path has an antenna port, a reception output port, and reception transistors. The reception path includes a first reception transistor that is closest to the antenna port, out of the reception transistors, and has a source-bulk connection, and at least one other reception transistor that has a bulk-to-ground connection. The reception transistors and the transmission transistors are CMOS transistors.

    AUTOMATIC FREQUENCY SHIFT COMPENSATION (AFSC) IN RESONANT TANK CIRCUITS OVER THE PROCESS VARIATION
    27.
    发明申请
    AUTOMATIC FREQUENCY SHIFT COMPENSATION (AFSC) IN RESONANT TANK CIRCUITS OVER THE PROCESS VARIATION 有权

    公开(公告)号：US20210184631A1

    公开(公告)日：2021-06-17

    申请号：US17103880

    申请日：2020-11-24

    Applicant: DSP Group Ltd.

    Inventor： Sergey Anderson

    IPC: H03F1/02 ,  H03F3/193 ,  H03F1/56

    Abstract: A low noise amplifier that may include a first input port, a second input port, a first capacitor, a second capacitor, a first variable capacitor, a second variable capacitor, an inductor, a bias circuit, a tuning circuit, a first output circuit having a first output, a second output circuit having a second output; wherein the first input port is electrically coupled to a first end of the second variable capacitor, to a first end of the first capacitor, to an input of the first output circuit, and to a first port of the inductor; wherein the second input port is electrically coupled to a second end of the first variable capacitor, to a second end of the second capacitor, to an input of the second output circuit, and to a second port of the inductor; wherein a first port of the first varactor is electrically coupled to a second end of the first capacitor; wherein a second port of the second varactor is electrically coupled to a first end of the second capacitor; wherein the bias circuit is configured to supply a bias voltage to a third port of the inductor; and wherein the tuning circuit is configured to control a capacitance of the first varactor and a capacitance of the variable capacitor.

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