Impedance matching for a dual band power amplifier

    公开(公告)号:US06243566B1

    公开(公告)日:2001-06-05

    申请号:US09562734

    申请日:2000-05-01

    Abstract: An exciter matching circuit (125), interstage matching circuit (134), and harmonic filter matching circuit (140) match impedances at the input to a two-stage power amplifier (130), between the first stage (132) and the second stage (136) of the power amplifier (130), and at the output of the power amplifier (130) for more than one frequency band of interest. In a GSM/DCS dual band radiotelephone (101), the matching circuits (124, 134, 140) provide low return loss at 900 MHz when the dual band transmitter (110) is operating in the GSM mode. The harmonic filter matching circuit (140) also filters out signals at 1800 MHz, 2700 MHz, and high order harmonics. When the dual band transmitter (110) is in DCS mode, however, the matching circuits (124, 134, 140) provide a low return loss at 1800 MHz and filter out signals at 2700 MHz and harmonics of 1800 MHz.

    Impedance matching for a dual band power amplifier
    3.
    发明授权
    Impedance matching for a dual band power amplifier 有权
    双频功率放大器的阻抗匹配

    公开(公告)号:US06215359B1

    公开(公告)日:2001-04-10

    申请号:US09563721

    申请日:2000-05-01

    Abstract: An exciter matching circuit (125), interstage matching circuit (134), and harmonic filter matching circuit (140) match impedances at the input to a two-stage power amplifier (130), between the first stage (132) and the second stage (136) of the power amplifier (130), and at the output of the power amplifier (130) for more than one frequency band of interest. In a GSM/DCS dual band radiotelephone (101), the matching circuits (124, 134, 140) provide low return loss at 900 MHz when the dual band transmitter (110) is operating in the GSM mode. The harmonic filter matching circuit (140) also filters out signals at 1800 MHz, 2700 MHz, and high order harmonics. When the dual band transmitter (110) is in DCS mode, however, the matching circuits (124, 134, 140) provide a low return loss at 1800 MHz and filter out signals at 2700 MHz and harmonics of 1800 MHz.

    Abstract translation: 激励器匹配电路(125),级间匹配电路(134)和谐波滤波器匹配电路(140)将在两级功率放大器(130)的输入端的阻抗匹配在第一级(132)和第二级 (130)的功率放大器(130)的输出端以及用于多于一个感兴趣频带的功率放大器(130)的输出端。 在GSM / DCS双频带无线电话(101)中,当双频带发射机(110)以GSM模式工作时,匹配电路(124,134,140)在900MHz时提供低回波损耗。 谐波滤波器匹配电路(140)还滤除1800MHz,2700MHz和高次谐波的信号。 然而,当双频带发射机(110)处于DCS模式时,匹配电路(124,134,140)在1800MHz提供低回波损耗并且滤除2700MHz的信号和1800MHz的谐波。

    Impedance matching for a dual band power amplifier
    4.
    发明授权
    Impedance matching for a dual band power amplifier 失效
    双频功率放大器的阻抗匹配

    公开(公告)号:US6078794A

    公开(公告)日:2000-06-20

    申请号:US802831

    申请日:1997-02-19

    Abstract: An exciter matching circuit (125), interstage matching circuit (134), and harmonic filter matching circuit (140) match impedances at the input to a two-stage power amplifier (130), between the first stage (132) and the second stage (136) of the power amplifier (130), and at the output of the power amplifier (130) for more than one frequency band of interest. In a GSM/DCS dual band radiotelephone (101), the matching circuits (124, 134, 140) provide low return loss at 900 MHz when the dual band transmitter (110) is operating in the GSM mode. The harmonic filter matching circuit (140) also filters out signals at 1800 MHz, 2700 MHz, and high order harmonics. When the dual band transmitter (110) is in DCS mode, however, the matching circuits (124, 134, 140) provide a low return loss at 1800 MHz and filter out signals at 2700 MHz and harmonics of 1800 MHz.

    Abstract translation: 激励器匹配电路(125),级间匹配电路(134)和谐波滤波器匹配电路(140)将在两级功率放大器(130)的输入端的阻抗匹配在第一级(132)和第二级 (130)的功率放大器(130)的输出端以及用于多于一个感兴趣频带的功率放大器(130)的输出端。 在GSM / DCS双频带无线电话(101)中,当双频带发射机(110)以GSM模式工作时,匹配电路(124,134,140)在900MHz时提供低回波损耗。 谐波滤波器匹配电路(140)还滤除1800MHz,2700MHz和高次谐波的信号。 然而,当双频带发射机(110)处于DCS模式时,匹配电路(124,134,140)在1800MHz提供低回波损耗并且滤除2700MHz的信号和1800MHz的谐波。

    Automated surface treatment apparatus having current monitoring means
    5.
    发明授权
    Automated surface treatment apparatus having current monitoring means 失效
    具有电流监测装置的自动表面处理装置

    公开(公告)号:US5975985A

    公开(公告)日:1999-11-02

    申请号:US960798

    申请日:1997-10-30

    CPC classification number: B24C3/067

    Abstract: An apparatus and associated method are disclosed for the treatment of a surface through the projection of an abrading material against the surface. The abrading material is fed from a hopper to a centrifugal blast wheel which projects the abrading material toward the surface, the blast wheel rotated by a blast motor. A controllably positionable valve is disposed between the hopper and the blast wheel to regulate a rate at which the abrading material passes from the hopper to the blast wheel. During operation, a target current to be applied to the blast motor is determined by a control circuit, the target current indicative of a desired rate of abrasion of the surface. The control circuit then measures the current applied to the blast wheel and controls the position of the valve in relation to the target current and the measured current.

    Abstract translation: 公开了一种用于通过研磨材料对表面的突出来处理表面的装置和相关方法。 研磨材料从料斗进料到将研磨材料朝向表面突出的离心鼓轮,鼓轮由鼓风马达旋转。 可控定位阀设置在料斗和鼓风轮之间,以调节研磨材料从料斗到鼓风轮的速度。 在操作期间,施加到鼓风电动机的目标电流由控制电路确定,目标电流表示表面的期望磨损率。 然后,控制电路测量施加到鼓轮的电流,并且相对于目标电流和测量的电流控制阀的位置。

    Method and apparatus for amplifying a signal
    6.
    发明授权
    Method and apparatus for amplifying a signal 失效
    用于放大信号的方法和装置

    公开(公告)号:US5673001A

    公开(公告)日:1997-09-30

    申请号:US482158

    申请日:1995-06-07

    CPC classification number: H03F1/0233 H03G3/3042 Y02B60/50

    Abstract: A unique method and apparatus modifies the load impedance at the output of a power amplifier by varying a voltage variable capacitor (VVC) (310) to maximize the efficiency of the power amplifier (304). A comparator (509) generates amplifier control signal (211) based upon a detected power output signal (216) and a reference signal. In addition to providing power control, the control signal is also coupled to a VVC circuit (506) to control the output impedance of the power amplifier. In an alternate embodiment, a separate VVC control signal (527) based upon a comparison of the power control signal and the battery voltage is coupled to a VVC. In another alternate embodiment, a second VVC can be coupled in parallel to the first VVC. The second VVC is preferably controlled by a signal (805) based upon the current in the power amplifier. Finally, an alternate embodiment incorporates a VVC circuit (506) at the input of the power amplifier to compensate for variations in input impedance to improve other power amplifier parameters such as IM, gain, output power and noise level.

    Abstract translation: 独特的方法和装置通过改变电压可变电容器(VVC)(310)来修改功率放大器的输出处的负载阻抗,以最大化功率放大器(304)的效率。 比较器(509)基于检测到的功率输出信号(216)和参考信号产生放大器控制信号(211)。 除了提供功率控制之外,控制信号还耦合到VVC电路(506)以控制功率放大器的输出阻抗。 在替代实施例中,基于功率控制信号和电池电压的比较的单独的VVC控制信号(527)耦合到VVC。 在另一替代实施例中,第二VVC可以与第一VVC并联耦合。 第二VVC优选地基于功率放大器中的电流由信号(805)控制。 最后,替代实施例在功率放大器的输入处并入VVC电路(506),以补偿输入阻抗的变化,以改善其他功率放大器参数,例如IM,增益,输出功率和噪声电平。

    REPTILE CAGE LINER
    7.
    发明申请
    REPTILE CAGE LINER 审中-公开

    公开(公告)号:US20190274275A1

    公开(公告)日:2019-09-12

    申请号:US16288661

    申请日:2019-02-28

    Abstract: A reptile cage liner is formed as a blank having selective cuts and creases to reduce section modulus to provide a stiff but foldable wall (flap) on each side of a rectangular floor. Flaps fold or bend preferentially along creases to form the liner. Residual stiffness of creases urges edges of the flaps to seal by contacting walls of a cage tray. Corner, funnel tabs tilt downward and extend laterally from each side flap across a corner gap to prevent escape of bedding, food, or other debris into corners or behind the liner. Liners may be easily replaceable and disposable.

    System and method for discovering undiscovered nodes using a registry bit in a point-to-multipoint network
    9.
    发明授权
    System and method for discovering undiscovered nodes using a registry bit in a point-to-multipoint network 有权
    使用点对多点网络中的注册表位发现未发现的节点的系统和方法

    公开(公告)号:US07428586B2

    公开(公告)日:2008-09-23

    申请号:US10097027

    申请日:2002-03-12

    CPC classification number: H04L12/413

    Abstract: Various embodiments and techniques are described for discovery in a network, and for automatically discovering one or more nodes of the network. In an embodiment a discovery loop may be implemented to detect new nodes that may have been added to the network. The data transmission from the nodes may be paused, and undiscovered nodes may be requested to identify themselves. Each node that identifies itself may then be configured by, for example, having a time slot assigned for data transmission from the node. Separate time slots may be assigned to allow multiple nodes to transmit data over certain types of networks without colliding with each other. Data transmission from the nodes may then be resumed.

    Abstract translation: 描述了用于在网络中发现并且用于自动发现网络的一个或多个节点的各种实施例和技术。 在一个实施例中,可以实现发现循环以检测可能已被添加到网络的新节点。 可以暂停来自节点的数据传输,并且可以请求未发现的节点来识别它们。 然后可以通过例如具有分配用于从节点进行数据传输的时隙来配置标识其自身的每个节点。 可以分配单独的时隙以允许多个节点在某些类型的网络上传输数据而不会相互碰撞。 然后可以恢复来自节点的数据传输。

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