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    AGC system for receiver
    11.
    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

    Receiver for use in wireless communications and method of operation of the receiver
    12.
    发明专利
    Receiver for use in wireless communications and method of operation of the receiver 未知

    公开(公告)号：GB2437574B

    公开(公告)日：2008-06-25

    申请号：GB0608363

    申请日：2006-04-28

    Applicant: MOTOROLA INC

    Inventor： CORSE NIR ,  BEN-AYUN MOSHE ,  GROSSMAN OVADIA ,  ROZENTAL MARK

    IPC: H03D3/00

    Abstract: A wireless receiver (100) for receiving and demodulating a frequency modulated RF (radio frequency) signal by a direct conversion procedure, including channels (110, 112) for producing in-phase and quadrature components of a received RF signal, and a processor (123, 133) for periodically estimating an error in at least one of the in-phase and quadrature phase components and for producing a signal for adjustment of at least one of the in-phase and quadrature components to compensate for the detected error, wherein the processor is operable to apply alternatively each of a plurality of different procedures to estimate the error, the procedures including a first procedure which is applied when a signal quality value of the received RF signal is above a threshold value and a second procedure which is applied when a signal quality value of the RF received signal is not above the threshold value.

    Wireless communication unit, linearised transmitter circuit and method of linearising therein
    14.
    发明专利
    Wireless communication unit, linearised transmitter circuit and method of linearising therein 未知

    公开(公告)号：GB2408860B

    公开(公告)日：2006-12-20

    申请号：GB0328110

    申请日：2003-12-04

    Applicant: MOTOROLA INC

    Inventor： BEN-AYUN MOSHE ,  GROSSMAN OVADIA ,  ROZENTAL MARK

    IPC: H04L27/36 ,  H03F1/32

    Abstract: A wireless communication unit (300) comprises a linearised transmitter (325, 500) having a power amplifier (324), a forward path and a feedback path for feeding back a portion of a signal to be transmitted, wherein the feedback path and forward path form two loops in quadrature. A processor (322) applies one or more training signals to a first quadrature circuit loop and a second quadrature circuit loop and measures a quadrature imbalance between the first and second quadrature circuit loops. In response the processor adjusts at least one parameter setting of a loop adjustment function (442) to balance the quadrature circuit loops. A linearised transmitter and method of training are also described. The measuring and compensating for any loop imbalance between 'I' and 'Q' paths around a feedback path provides improved accuracy and stability in phase and/or amplitude.

    Direct conversion FM receiver employing average DC offset correction
    16.
    发明专利
    Direct conversion FM receiver employing average DC offset correction 未知

    公开(公告)号：GB2424326A

    公开(公告)日：2006-09-20

    申请号：GB0505493

    申请日：2005-03-18

    Applicant: MOTOROLA INC

    Inventor： BEN-AYUN MOSHE ,  ROZENTAL MARK ,  CORSE NIR ,  GROSSMAN OVADIA

    IPC: H03D1/22 ,  H03D3/00

    Abstract: A receiver 200 for receiving and demodulating a frequency modulated RF signal by a direct conversion procedure includes an input signal path (101) receiving an RF input signal (x(t)), an I-channel (103) including a first mixer 107 for mixing the RF input signal with an in-phase reference signal to produce an in-phase component (I(t)), a Q-channel 105 including a second mixer 109 for mixing the input signal with a quadrature-phase reference signal to produce a quadrature-phase component (Q(t)). The receiver further includes a compensator for repeatedly measuring and compensating for DC offset produced by the receiver and combined with the input signal component in a respective I and/or Q channel. The compensator estimates 202, 204 a component of the DC offset present in the respective channel (I, Q) by (i) taking a set of N samples of the value of the input signal component in the respective channel; (ii) summing the values obtained for the N samples; and (iii) calculating an average value by dividing the sum by the number N of samples, and a combiner 206, 207 operable to combine with the input signal component an adjustment signal which cancels the estimated DC noise component in the respective channel. The receiver may also include a controller 203 operably coupled to the estimator 202, 205 to provide control signals to indicate when the estimator of the compensator should release the noise value it has estimated. The controller may also indicate an integration time to be used by the estimator of each compensator. The controller may include a detector which assists in control of the estimators by determining a frequency offset between the carrier frequency of the input signal and the reference signal produced by a local oscillator 221. The controller may, via a frequency setter 222, adaptively adjust the reference frequency produced by the local oscillator.

    Multi-frequency band antenna and methods of tuning and manufacture
    19.
    发明专利
    Multi-frequency band antenna and methods of tuning and manufacture 未知

    公开(公告)号：GB2389232B

    公开(公告)日：2004-10-27

    申请号：GB0212832

    申请日：2002-06-01

    Applicant: MOTOROLA INC

    Inventor： GROSSMAN OVADIA ,  BEN-AYUN MOSHE ,  YANIV SALEM

    IPC: H01Q1/36 ,  H01Q5/00 ,  H01Q5/357

    Abstract: A multi-frequency band antenna ( 100 ) includes a dual-pitch coil ( 120, 130 ), and a top insert ( 140 ), operably coupled to an antenna base ( 105 ). The multi-frequency band antenna ( 100 ) is configured to radiate electromagnetic signals at a lower frequency 230 ) of multi-frequencies using substantially the whole of the dual-pitch coil ( 120, 130 ); and at a higher frequency ( 240 ) of said multi-frequencies using a length of said antenna base ( 105, 110 ) and a portion of said dual-pitch coil ( 120 ). A first portion of the dual-pitch coil has a longer pitch than a second portion of the coil and the first portion has a first end attached to the antenna base and a second end attached to the second portion, and the second portion has an effective electrical length substantially equal to a wavelength (lambda) of radiation having a frequency corresponding to a frequency in the second band.

    WIRELESS SUBSCRIBER COMMUNICATION UNIT AND ANTENNA ARRANGEMENT THEREFOR
    20.
    发明专利
    WIRELESS SUBSCRIBER COMMUNICATION UNIT AND ANTENNA ARRANGEMENT THEREFOR 未知

    公开(公告)号：AU2003302563A1

    公开(公告)日：2004-06-23

    申请号：AU2003302563

    申请日：2003-10-20

    Applicant: MOTOROLA INC

    Inventor： GROSSMAN OVADIA ,  BEN-AYUN MOSHE ,  ROZENTAL MARK

    IPC: H01Q1/24 ,  H01Q21/28 ,  H04B7/06 ,  H04B1/38

    Abstract: A wireless subscriber communication unit ( 200 ) comprises an antenna arrangement ( 202, 330, 430 ) for radiating and/or receiving electromagnetic signals. A transmitter ( 220 ) and/or a receiver ( 210 ) is/are operably coupled to the antenna arrangement ( 202, 330, 430 ), for transmitting/receiving a radio signal. An antenna arrangement comprises an internal antenna located within the wireless communication unit ( 200 ) and an external antenna located substantially outside of the wireless communication unit, such that both the internal antenna ( 330, 430 ) and the external antenna ( 202 ) co-operate on substantially the same electromagnetic signal. In this manner, by provision of both an internal and an external antenna the wireless subscriber communication unit is able to function adequately should an antenna become disconnected, malfunction, or its performance suffer from impedance mismatching. Preferably, the internal and external antennas can be configured to be orthogonal to one another, thereby providing the wireless subscriber unit with the ability to operate with a substantially circular or elliptical polarization.

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