Quadrature modulator having phase shift and amplitude compensation
circuits
    61.
    发明授权
    Quadrature modulator having phase shift and amplitude compensation circuits 失效
    具有相移和幅度补偿电路的正交调制器

    公开(公告)号:US5367271A

    公开(公告)日:1994-11-22

    申请号:US130551

    申请日:1993-10-01

    IPC分类号: H03H11/18 H04L27/20 H04L27/36

    CPC分类号: H04L27/2071

    摘要: A quadrature modulator includes a 0.degree./90.degree. phase shifter including only resistors, capacitors, and transistors that separates an input carrier wave into two carrier waves having a phase difference of 90.degree. from each other by differentiating and integrating. The quadrature modulator includes amplitude compensating circuits for converting the two carrier waves from sinusoidal waveforms to rectangular waveforms having predetermined amplitudes. The amplitude compensating circuits are inserted between the phase shifter and double-balanced mixers. The phase shifter consists of circuit elements appropriate for circuit integration and produces a high degree of orthogonality in its output signals as a function of variations in the characteristic values of the circuit elements. Complementary carriers having precise orthogonality as well as superior balance are input to double-balanced mixers. Accordingly, a superior modulation wave having fewer spurious components is obtained easily with simplified circuit integration.

    摘要翻译: 正交调制器包括0°/ 90°移相器,其仅包括通过微分和积分将输入载波彼此相差90°的两个载波分离的电阻器,电容器和晶体管。 正交调制器包括用于将两个载波从正弦波形转换成具有预定幅度的矩形波形的幅度补偿电路。 振幅补偿电路插入在移相器和双平衡混频器之间。 移相器由适合于电路集成的电路元件组成,并且在其输出信号中产生高度正交性,作为电路元件的特性值的变化的函数。 具有精确正交性和优异平衡的互补载体输入双平衡混频器。 因此,通过简化的电路集成容易地获得具有较少杂散分量的优良调制波。

    Power amplifier
    65.
    发明授权
    Power amplifier 有权
    功率放大器

    公开(公告)号:US08461929B2

    公开(公告)日:2013-06-11

    申请号:US13195066

    申请日:2011-08-01

    IPC分类号: H03G3/30

    摘要: A power amplifier includes a first amplifier unit, a second amplifier unit, and an attenuator. The second amplifier receives a signal from the first amplifier unit and amplifies the signal. The attenuator is provided between the first and second amplifier units. The attenuator has arms, including at least one parallel arm and at least one series arm, and has switches connected to the arms to switch the electrical connection states of the arms with respect to the first and second amplifier units. The at least one parallel arm and the at least one series arm are alternately arranged, in the order named, as viewed in the direction from the first amplifier unit to the second amplifier unit.

    摘要翻译: 功率放大器包括第一放大器单元,第二放大器单元和衰减器。 第二放大器从第一放大器单元接收信号并放大信号。 衰减器设置在第一和第二放大器单元之间。 衰减器具有包括至少一个并联臂和至少一个串联臂的臂,并且具有连接到臂的开关,以相对于第一和第二放大器单元切换臂的电连接状态。 按照从第一放大器单元到第二放大器单元的方向观察,所述至少一个并联臂和至少一个串联臂交替排列。

    Power amplifier
    66.
    发明授权
    Power amplifier 有权
    功率放大器

    公开(公告)号:US08354888B2

    公开(公告)日:2013-01-15

    申请号:US13195051

    申请日:2011-08-01

    IPC分类号: H03F3/04

    摘要: A power amplifier includes an input matching circuit, an amplifier transistor for amplifying an input signal received through the input matching circuit, an element for varying the collector voltage of the amplifier transistor, a bias circuit for varying the idle current in the amplifier transistor, and a compensation circuit for varying capacitance of the input matching circuit to maintain the phase shift and the input reflection in the power amplifier constant when the collector voltage and the idle current are varied, to prevent a decrease in the efficiency of the power amplifier due to changes in the output power of the amplifier transistor.

    摘要翻译: 功率放大器包括输入匹配电路,用于放大通过输入匹配电路接收的输入信号的放大器晶体管,用于改变放大器晶体管的集电极电压的元件,用于改变放大器晶体管中的空闲电流的偏置电路,以及 用于改变输入匹配电路的电容的补偿电路,以在集电极电压和空闲电流变化时保持功率放大器的相移和输入反射恒定,以防止由于变化而导致的功率放大器的效率的降低 在放大晶体管的输出功率。

    Sheet inverting and conveying mechanism and sheet inverting and conveying apparatus
    68.
    发明授权
    Sheet inverting and conveying mechanism and sheet inverting and conveying apparatus 有权
    纸张翻转和输送机构和纸张翻转和输送设备

    公开(公告)号:US08109510B2

    公开(公告)日:2012-02-07

    申请号:US12278690

    申请日:2007-03-05

    IPC分类号: B65H5/02

    摘要: There is provided a sheet inverting and conveying mechanism for conveying a sheet in a first direction, inverting obverse and reverse sides of the sheet, and then conveying the inverted sheet in a second direction. The mechanism includes: a first conveyance section for receiving, at its conveyance face, one side of the sheet, and for conveying the sheet in the first direction; a sheet inverting section for receiving, at its bent inner peripheral face, one side of the sheet, and for inverting the sheet while bending the sheet along the bent inner peripheral face; and a second conveyance section for receiving, at its conveyance face, one side of the inverted sheet, and for conveying the sheet in the second direction, wherein the first conveyance section and the second conveyance section are formed so that the sheet is conveyed while being attracted to the conveyance faces.

    摘要翻译: 提供了一个用于在第一方向上传送片材并翻转片材的正面和反面,然后在第二方向上输送倒片的片材翻转和传送机构。 所述机构包括:第一输送部,其输送面在所述纸的一侧接收,并沿所述第一方向输送所述纸; 片材翻转部分,用于在其弯曲的内周面处接收片材的一侧,并且用于在沿着弯曲的内周面弯曲片材的同时翻转片材; 以及第二输送部,其在其输送面处接收所述倒置片的一侧,并且在所述第二方向上输送所述片,其中所述第一输送部和所述第二输送部形成为使得所述片被输送,同时 吸引到运输面。

    DETECTOR CIRCUIT AND SEMICONDUCTOR DEVICE USING SAME
    69.
    发明申请
    DETECTOR CIRCUIT AND SEMICONDUCTOR DEVICE USING SAME 有权
    使用相同的检测电路和半导体器件

    公开(公告)号:US20110187349A1

    公开(公告)日:2011-08-04

    申请号:US12941134

    申请日:2010-11-08

    IPC分类号: G01R19/22

    摘要: A detector circuit for detecting degradation in the distortion characteristics of a power amplifier based on signals from both ends of a coupled line of a directional coupler. The detector circuit includes a phase shifter/attenuator for phase shifting and attenuating a signal from a coupled terminal of the coupled line, a differential amplifier for outputting difference between an output signal from the phase shifter/attenuator and a signal from the isolated terminal of the coupled line, a wave detector circuit for converting the difference into a DC signal, and a comparing circuit for determining whether the voltage level of the DC signal exceeds a predetermined level. When degradation in the distortion characteristics of the power amplifier arises, the phase shifter/attenuator phase shifts the signal from the coupled terminal and outputs a signal 180° out of phase with the signal from the isolated terminal.

    摘要翻译: 一种用于根据来自定向耦合器的耦合线的两端的信号来检测功率放大器的失真特性的劣化的检测器电路。 检测器电路包括用于相移和衰减来自耦合线的耦合端的信号的移相器/衰减器,用于输出来自移相器/衰减器的输出信号与来自该移相器/衰减器的隔离端的信号的差分放大器 耦合线,用于将差值转换为DC信号的波检测器电路,以及用于确定DC信号的电压电平是否超过预定电平的比较电路。 当功率放大器的失真特性出现降低时,移相器/衰减器将来自耦合端子的信号相移,并输出与隔离端子信号180°异相的信号。

    Power amplifier bias circuit
    70.
    发明授权
    Power amplifier bias circuit 有权
    功率放大器偏置电路

    公开(公告)号:US07936219B2

    公开(公告)日:2011-05-03

    申请号:US12712234

    申请日:2010-02-25

    IPC分类号: H03F3/04

    摘要: A power amplifier and bias circuit includes a combination circuit in which a voltage drive bias circuit and a current drive bias circuit are connected in a parallel relationship with each other. The power amplifier bias circuit also includes an idle current control circuit which uses the collector voltage of amplifier transistors. When the collector voltage of the amplifier transistors is lower than the threshold voltage of a first transistor (approximately 1.3 V), the first transistor is turned off. At that time, since the reference voltage (2.4-2.5 V) is higher than the voltage for turning on both a second transistor and a diode (namely, approximately 1.3 V plus 0.7 V), a current flows and the first transistor turns on. As a result, a current is drawn from the bases of the amplifier transistors to GND through two resistances, so that the idle currents of the amplifier transistors decrease.

    摘要翻译: 功率放大器和偏置电路包括其中电压驱动偏置电路和电流驱动偏置电路彼此并联连接的组合电路。 功率放大器偏置电路还包括使用放大器晶体管的集电极电压的空闲电流控制电路。 当放大器晶体管的集电极电压低于第一晶体管(约1.3V)的阈值电压时,第一晶体管截止。 此时,由于参考电压(2.4-2.5V)高于用于接通第二晶体管和二极管的电压(即,大约1.3V加上0.7V),所以电流流过,第一晶体管导通。 结果,通过两个电阻将电流从放大器晶体管的基极拉到GND,使得放大器晶体管的空闲电流减小。