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    AGC system for receiver
    1.
    发明专利
    AGC system for receiver 未知

    公开(公告)号：GB2457070A

    公开(公告)日：2009-08-05

    申请号：GB0801872

    申请日：2008-02-01

    Applicant: MOTOROLA INC

    Inventor： SALEM YANIV ,  BEN-AYUN MOSHE ,  CHERMOSHNIUK OLEG ,  MALKA HAIM

    IPC: H03G3/20

    Abstract: An RF receiver 100 includes a variable gain device in the form of a low noise amplifier 105 for receiving an input RF signal, mixers 107/109 and baseband channels 115/117 which include analogue to digital converters 128 and 138. The receiver includes off-channel signal detectors 103 and 106 and an AGC controller 141. Operation of the AGC loop 130 is characterized (fig.2) in that the off-channel detector detects (i) a first condition when an off-channel signal has a level not less than a first detection threshold, and (ii) a second condition in which, during operation of the AGC loop, an off-channel signal has been attenuated by the variable gain device to a level not greater than a second detection threshold; wherein, on receiving indication (i) the AGC controller activates the loop using a set AGC threshold, and, on receiving indication (ii) the controller dynamically adjusts the AGC threshold to achieve a wanted level of on-channel signal. Keywords: TETRA, TEDS, adjacent channel, desensitize, IP2, intermodulation

    A receiver amplifier with adaptive bias for large dynamic range
    2.
    发明专利
    A receiver amplifier with adaptive bias for large dynamic range 未知

    公开(公告)号：GB2455555A

    公开(公告)日：2009-06-17

    申请号：GB0724370

    申请日：2007-12-14

    Applicant: MOTOROLA INC

    Inventor： MALKA HAIM ,  BEN-AYUN MOSHE ,  CHERMOSHNIUK OLEG ,  SALEM YANIV

    IPC: H03F1/02 ,  H03F1/32

    Abstract: A strong off channel signal can cause compression in the receiver amplifier of a mobile TETRA terminal, thereby distorting on-channel signals and reducing dynamic range. The signal-to-noise ratio (SNR) and noise figure are reduced because the gain for on-channel signals falls. To counteract these effects the bias current is increased when compression is sensed trough a fall in the bias node voltage VB (figure 2). For example, where the device 101 is an NPN bipolar transistor, a strong RF signal at node 103 leads to a fall in the DC voltage at the base node. The comparator 137, which may have hysteresis, responds to a fall in VB by signalling the current controller 131 to supply more bias current to the amplifying device 101.

    A combined wireless communication device and megaphone
    3.
    发明专利
    A combined wireless communication device and megaphone 未知

    公开(公告)号：GB2408424A

    公开(公告)日：2005-05-25

    申请号：GB0327184

    申请日：2003-11-21

    Applicant: MOTOROLA INC

    Inventor： PILAS MARCO ,  BEN-AYUN MOSHE ,  MALKA HAIM

    IPC: H04B1/38 ,  H04M9/00

    Abstract: A wireless communication device is provided, comprising a microphone and loudspeaker. The device is operable to communicate wirelessly via direct radio link and/or via a base station. The wireless communication device also comprises a reversibly switchable coupling means, in use in a first switching state operably coupling said microphone to said loudspeaker via an amplifier, and in use in a second switching state operably decoupling said microphone from said loudspeaker. This arrangement advantageously combines the functions of a wireless communications device and a megaphone, so reducing the number of items of equipment a user carries.

    Switch off of mobile station receiver during repeated idle mode messages
    5.
    发明专利
    Switch off of mobile station receiver during repeated idle mode messages 未知

    公开(公告)号：GB2410654A

    公开(公告)日：2005-08-03

    申请号：GB0403119

    申请日：2004-01-28

    Applicant: MOTOROLA INC

    Inventor： OHEV-ZION EITAN ,  MALKA HAIM ,  OFIR GABI

    IPC: H04B1/16 ,  H04W52/02

    Abstract: A remote unit (103) for a cellular radio communication system (100) comprises a receiver (203) which in idle mode monitors for idle mode messages, such as paging messages, transmitted from a base station (101). The remote unit (103) has no information of when idle mode messages specifically addressed to the remote unit (103) are transmitted within the idle mode message channel. The receiver (203) is coupled to a redundancy characteristic processor (205) which determines a redundancy characteristic associated with a downlink idle mode message operation. The redundancy characteristic may for example be an indication of a number of times a given idle mode message is repeated by the base station (101). The remote unit (103) further comprises an idle mode controller (207) which is operable to switch between a plurality of idle operation modes in response to the redundancy characteristic. The idle operation modes include a reduced operation idle mode which preferably includes powering down the receiver (203) when repeat idle mode messages may be transmitted.

    RECEIVER AND METHOD OF OPERATION FOR USE IN MOBILE COMMUNICATIONS
    9.
    发明申请
    RECEIVER AND METHOD OF OPERATION FOR USE IN MOBILE COMMUNICATIONS 审中-公开
    接收机和用于移动通信的操作方法

    公开(公告)号：WO2009099786A2

    公开(公告)日：2009-08-13

    申请号：PCT/US2009031978

    申请日：2009-01-26

    Applicant: MOTOROLA INC ,  SALEM YANIV S ,  AYUN MOSHE BEN ,  CHERMOSHNIUK OLEG ,  MALKA HAIM

    Inventor： SALEM YANIV S ,  AYUN MOSHE BEN ,  CHERMOSHNIUK OLEG ,  MALKA HAIM

    IPC: H04B1/16 ,  H04B1/10

    CPC classification number: H03G3/3052

    Abstract: An RF receiver (100) includes a variable gain device (105) for receiving an input RF signal, a mixer (107) for converting a signal produced by the variable gain device to a baseband signal, a baseband receiver channel (115) for processing the baseband signal, an AGC loop (130) coupled from the baseband channel to the variable gain device to provide AGC of the variable gain device, an AGC controller (141) to select an AGC threshold for use in the AGC loop, and an off-channel detector arrangement (103, 106) coupled to the AGC controller for detecting and indicating to the AGC controller: (i) a first condition when an off-channel signal has a level not less than a first detection threshold; and (ii) a second condition which during operation of the AGC loop is reached when an off-channel signal has been attenuated by the variable gain device to a level not greater than a second detection threshold, the AGC controller being operable upon receiving indication of the first condition to activate the AGC loop using a set AGC threshold and upon receiving indication of the second condition to dynamically adjust the AGC threshold to give a wanted level of a wanted on-channel signal.

    Abstract translation: RF接收器（100）包括用于接收输入RF信号的可变增益器件（105），用于将由可变增益器件产生的信号转换为基带信号的混频器（107），用于处理的基带接收器通道（115） 所述基带信号，从所述基带信道耦合到所述可变增益装置以提供所述可变增益装置的AGC的AGC环路（130），选择用于所述AGC环路中的AGC阈值的AGC控制器（141），以及关闭 （103,106），耦合到所述AGC控制器，用于检测并向所述AGC控制器指示：（i）当信道外信号具有不小于第一检测阈值的电平时的第一条件; 以及（ii）第二状态，其在AGC环路的操作期间当信道外信号已被可变增益设备衰减到不大于第二检测阈值的水平时，AGC控制器在接收到 使用设定的AGC阈值激活AGC环路并且在接收到第二条件的指示以动态调整AGC阈值以给出期望的信道上信号电平的情况下的第一条件。

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