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    24.
    发明专利
    未知

    公开(公告)号：DE2717059A1

    公开(公告)日：1977-11-10

    申请号：DE2717059

    申请日：1977-04-18

    Applicant: MOTOROLA INC

    Inventor： SKUTTA FRANK ROBERT

    IPC: H03G7/06 ,  H03G3/20

    Abstract: The improved gain control circuit is comprised of an amplifier, a semiconductor device attenuator at the amplifier input, and unique control circuitry for controlling the attenuation factor of the semiconductor device. The amplifier is designed for low phase shift to minimize the time delay of its transfer function. The control circuitry responds to both positive and negative a.c. signal transitions at the amplifier output to initiate attenuator gain reduction. As with the amplifier, the control circuitry is designed for minimum response time. The combination results in an extremely fast a.g.c. attack time.

    Multiple frequency band receiver
    25.
    发明专利
    Multiple frequency band receiver 未知

    公开(公告)号：GB2347292B

    公开(公告)日：2001-04-18

    申请号：GB0003945

    申请日：2000-02-18

    Applicant: MOTOROLA INC

    Inventor： PECKHAM DAVID SUTHERLAND ,  DING DAVID Z ,  SKUTTA FRANK ROBERT ,  JOHNSON JR ROBERT M

    IPC: H03D7/12 ,  H04B1/40 ,  H04B1/26

    Abstract: A multiple frequency band receiver (102) receives at least two frequency bands that are close but not adjacent. A first bandpass filter (304) passes signals in the first frequency band. A second bandpass filter (306) passes signals in the second frequency band. The first and second filters each attenuate signals between the first and second frequency band to at least a first level so as to provide selectivity in the frequency range between the first and second frequencies to prevent the signals between these frequency bands from being further processed by the communication device. A third filter (322) coupled to first and second filters passes signals in both the first and second frequency band and attenuates signals above the pass band of the higher of the first and second filters and below the lower of the first and second filters.

    27.
    发明专利
    未知

    公开(公告)号：DE19806096C2

    公开(公告)日：2000-05-11

    申请号：DE19806096

    申请日：1998-02-14

    Applicant: MOTOROLA INC

    Inventor： VLAHOS CONSTANTINE ,  PECKHAM DAVID SUTHERLAND ,  SKUTTA FRANK ROBERT

    IPC: H04B1/40 ,  H03D7/12 ,  H03J1/00 ,  H04B1/26 ,  H04B1/44 ,  H04L27/00 ,  H04B1/06 ,  H04B1/16 ,  H04B7/005 ,  H04L27/38

    Abstract: A method and apparatus enables a communication device (100) to operate in multiple bands, such as GSM 900 MHz, DCS 1800 MHz, and DCS 1900 MHz bands, by eliminating the need for a mixer for each band. In a dual band GSM/DCS 1800 radiotelephone, for example, the local oscillator (LO) injection frequencies for both GSM and DCS bands are provided to a mixer (234) through the use of combination filters (222, 246). Thus, the duplexing and matching requirements to the mixer input are simplified and the signal losses are minimized. The common output ports of the GSM RX/LO combination filter and DCS RX/LO combination filter are duplexed to the input of the mixer. Also, the input impedance matching of the mixer is designed to match the impedance for the received signals in each band, as well as provide an RF trap at the IF frequency. The match at the output of the mixer is designed to match the impedance of the IF filter and provides a low impedance to RF input frequencies. Finally, a tri-band radiotelephone is also described.

    Method and apparatus for coupling signals
    28.
    发明专利
    Method and apparatus for coupling signals 未知

    公开(公告)号：AU714256B2

    公开(公告)日：1999-12-23

    申请号：AU6217496

    申请日：1996-08-21

    Applicant: MOTOROLA INC

    Inventor： BEUTLER SCOTT DAVID ,  CRUZ MICHAEL STEVEN ,  SKUTTA FRANK ROBERT

    IPC: H01Q1/24 ,  H01R12/50 ,  H01R13/648 ,  H01R24/40 ,  H04M1/02 ,  H04M1/215 ,  H04B1/40 ,  H04B1/18 ,  H04B7/26 ,  H04Q7/32

    Abstract: A unique apparatus for coupling radio frequency (RF) signals from a wireless communication device (200) to an external device by way of an I/O port (116). In particular, a connector having three adjacent contact elements (238) couples signals to an external device wherein the first and third contact elements (239, 241) are electrically coupled to a ground plane (302) and wherein the second or middle contact element (240) is electrically coupled to a conductive RF signal path (344). The ground plane and the conductive path (334) are preferably on a printed circuit (pc) board which is preferably a three layer board with the conductive path (334) located between two ground planes (302, 352). The connector is substantially covered with a shield (230) coupled by legs (248) to the ground plane (302) at apertures (332). A mating connector (400) also includes a shield (430) which is commonly grounded. The mating connector preferably includes an internally located coaxial connector (412) and cable (414) to minimize loss of RF communication signals. Components of the connectors (116, 400) are selectively grounded to eliminate RF interference and establish a reliable RF ground reference to a pc board (300) of the wireless communication device and the coaxial connector. The connectors also include latching members (405) and apertures (250) for firm coupling therebetween.

    Method and apparatus for coupling signals
    29.
    发明专利
    Method and apparatus for coupling signals 未知

    公开(公告)号：SG48470A1

    公开(公告)日：1998-04-17

    申请号：SG1996010534

    申请日：1996-08-22

    Applicant: MOTOROLA INC

    Inventor： BEUTLER SCOTT DAVID ,  CRUZ MICHAEL STEVEN ,  SKUTTA FRANK ROBERT

    IPC: H01Q1/24 ,  H01R12/50 ,  H01R13/648 ,  H01R24/40 ,  H04M1/02 ,  H04M1/215 ,  H04Q7/32

    Abstract: A unique apparatus for coupling radio frequency (RF) signals from a wireless communication device (200) to an external device by way of an I/O port (116). In particular, a connector having three adjacent contact elements (238) couples signals to an external device wherein the first and third contact elements (239, 241) are electrically coupled to a ground plane (302) and wherein the second or middle contact element (240) is electrically coupled to a conductive RF signal path (344). The ground plane and the conductive path (334) are preferably on a printed circuit (pc) board which is preferably a three layer board with the conductive path (334) located between two ground planes (302, 352). The connector is substantially covered with a shield (230) coupled by legs (248) to the ground plane (302) at apertures (332). A mating connector (400) also includes a shield (430) which is commonly grounded. The mating connector preferably includes an internally located coaxial connector (412) and cable (414) to minimize loss of RF communication signals. Components of the connectors (116, 400) are selectively grounded to eliminate RF interference and establish a reliable RF ground reference to a pc board (300) of the wireless communication device and the coaxial connector. The connectors also include latching members (405) and apertures (250) for firm coupling therebetween.

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