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    RF TRANSMITTER WITH TEMPERATURE COMPENSATED OUTPUT POWER LEVEL CONTROL CIRCUIT AND TEMPERATURE COMPENSATION METHOD
    1.
    发明专利
    RF TRANSMITTER WITH TEMPERATURE COMPENSATED OUTPUT POWER LEVEL CONTROL CIRCUIT AND TEMPERATURE COMPENSATION METHOD 失效

    公开(公告)号：JPH11220410A

    公开(公告)日：1999-08-10

    申请号：JP28663398

    申请日：1998-10-08

    Applicant: MOTOROLA INC

    Inventor： RICH RANDALL W

    IPC: H03F1/30 ,  H03G3/20 ,  H03G3/30 ,  H04B1/036 ,  H04B1/04 ,  H04B7/005

    Abstract: PROBLEM TO BE SOLVED: To provide the radio frequency(RF) transmitter that compensates an output power level of a transmission signal with respect to temperature. SOLUTION: An amplifier 112 with a variable gain responds to at least a reference signal and a plurality of temperature gain correction signals to amplify an information signal and to generate an amplified signal for the transmission of the RF transmission 102. A detector 132 detects an output power level of the amplified signal to generate a detection output power signal within a prescribed dynamic range. A temperature sensor 138 measures a plurality of temperatures. An error correction circuit 145 updates any of plurality of temperature gain correction signal stored in a memory element 142 relating to the RF transmitter 102 corresponding to any of a plurality of the temperature in response to the detected output power signal and reference signal during the transmission of the amplified signal and when the detected output power signal is within a prescribed dynamic range.

    Radio subscriber unit having a switched antenna diversity apparatus and method therefor
    2.
    发明专利
    Radio subscriber unit having a switched antenna diversity apparatus and method therefor 未知

    公开(公告)号：GB2307832B

    公开(公告)日：2000-01-26

    申请号：GB9624101

    申请日：1996-11-20

    Applicant: MOTOROLA INC

    Inventor： BRUCKERT EUGENE J ,  VILMUR RICHARD J ,  RICH RANDALL W

    IPC: H04B7/08

    Abstract: A radio subscriber unit (102) comprises a controller (108) and a switched antenna diversity receiver apparatus (106) including a first antenna (114), a second antenna (116) and a receiver (126). The first antenna (114) is adapted to receive a first representation (158) of a radio frequency (RF) signal (156). The second antenna (116) is adapted to receive a second representation (160) of the RF signal (156). The receiver (126), selectively coupled to the first antenna (114) and the second antenna (116), generates a received signal (153) responsive to receiving at least one of the first representation (158) of the RF signal (156) from the first antenna (114) and the second representation (160) of the RF signal (156) from the second antenna (116). The controller (108), coupled to the receiver (126), selectively couples to the receiver (126), responsive to the received signal (153), one of: only the first antenna (114), only the second antenna (116) and both the first antenna (114) and the second antenna (116).

    4.
    发明专利
    未知

    公开(公告)号：DE19739320A1

    公开(公告)日：1998-04-09

    申请号：DE19739320

    申请日：1997-09-09

    Applicant: MOTOROLA INC

    Inventor： RICH RANDALL W

    IPC: H03G3/30 ,  H04B1/04 ,  H04B7/005 ,  H03L5/02 ,  H04B1/38 ,  H03G3/20

    Abstract: A gain controller (130) for a radio frequency (RF) transmitter (102) controls a power level of a signal (123) transmitted within a predetermined range of output power levels. The gain controller (130) provides the first gain control signal (131) and the second gain control signal (133) responsive to an output power level control signal (150). The first gain control signal (131) controls a gain of a first variable gain stage (144) to vary the power level of the transmit signal (115) at an intermediate frequency causing the output power level of the transmit signal (123) to vary over a lower range of the predetermined range of output power levels. The second gain control signal (133) controls a gain of the second variable gain stage (120) to vary the power level of the transmit signal (121) at a radio frequency causing the output power level of the transmit signal (123) to vary over an upper range of the predetermined range of output power levels. The power control circuit (130) is advantageously utilized in a code division multiple access (CDMA) radiotelephone (100) to provide power control over an 85 dB range of power levels while minimizing sideband noise emissions, current drain, and complexity of the RF transmitter (102).

    Radio subscriber unit with switched antenna diversity
    5.
    发明专利
    Radio subscriber unit with switched antenna diversity 未知

    公开(公告)号：GB2307832A

    公开(公告)日：1997-06-04

    申请号：GB9624101

    申请日：1996-11-20

    Applicant: MOTOROLA INC

    Inventor： BRUCKERT EUGENE J ,  VILMUR RICHARD J ,  RICH RANDALL W

    IPC: H04B7/08

    Abstract: Radio subscriber unit 102 comprises controller 108 and switched antenna diversity receiver apparatus 106 including first antenna 114, second antenna 116 and receiver 126. The first antenna receives a first representation 158 of a radio frequency (RF) signal 156 whilst the second antenna receives a second representation 160 of it. The receiver, selectively coupled to the first and second antennae, generates a received signal 153 responsive to receiving at least one of the first representation 158 of the RF signal 156 from the first antenna and the second representation 160 of the RF signal 156 from the second antenna. The controller 108, coupled to the receiver, selectively couples to the receiver, responsive to the received signal 153, one of: only the first antenna, only the second antenna and both the first and second antennae. A load 124 may also be switched-in to compensate for the change in impedance when two antennae are coupled to the receiver.

    10.
    发明专利
    未知

    公开(公告)号：BR9704706A

    公开(公告)日：1999-01-19

    申请号：BR9704706

    申请日：1997-09-12

    Applicant: MOTOROLA INC

    Inventor： RICH RANDALL W

    IPC: H03G3/30 ,  H04B1/04 ,  H04B7/005 ,  H04Q7/32

    Abstract: A gain controller (130) for a radio frequency (RF) transmitter (102) controls a power level of a signal (123) transmitted within a predetermined range of output power levels. The gain controller (130) provides the first gain control signal (131) and the second gain control signal (133) responsive to an output power level control signal (150). The first gain control signal (131) controls a gain of a first variable gain stage (144) to vary the power level of the transmit signal (115) at an intermediate frequency causing the output power level of the transmit signal (123) to vary over a lower range of the predetermined range of output power levels. The second gain control signal (133) controls a gain of the second variable gain stage (120) to vary the power level of the transmit signal (121) at a radio frequency causing the output power level of the transmit signal (123) to vary over an upper range of the predetermined range of output power levels. The power control circuit (130) is advantageously utilized in a code division multiple access (CDMA) radiotelephone (100) to provide power control over an 85 dB range of power levels while minimizing sideband noise emissions, current drain, and complexity of the RF transmitter (102).

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