利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

581 条记录 (耗时 0.027 秒)

    Continuously variable gain radio frequency driver amplifier having linear in decibel gain control characteristics
    4.
    发明专利
    Continuously variable gain radio frequency driver amplifier having linear in decibel gain control characteristics 审中-公开
    连续可变增益无线电频率放大器具有线性增益控制特性

    公开(公告)号：JP2010273360A

    公开(公告)日：2010-12-02

    申请号：JP2010152232

    申请日：2010-07-02

    申请人： Qualcomm Inc ,  クゥアルコム・インコーポレイテッドQualcomm Incorporated

    发明人： BARNETT KENNETH ,  WALKER BRETT C ,  GARD KEVIN

    IPC分类号： H03G3/10 ,  H03F1/30 ,  H03G1/04 ,  H03G3/30 ,  H03G7/00 ,  H03G7/06 ,  H04B5/00

    CPC分类号： H04B5/00 ,  H03F1/301 ,  H03G1/04 ,  H03G3/3036 ,  H03G3/3042 ,  H03G7/001

    摘要： PROBLEM TO BE SOLVED: To provide a radio frequency (RF) driver amplifier system and method that provides linear in decibel gain control.
    SOLUTION: An RF driver amplifier system includes a linear transconductor receiving an input voltage and providing a controlled current on the basis of input voltage received, temperature compensation circuitry for varying power from the linear transconductor according to absolute temperature, an exponential current controller receiving power varied according to temperature and providing an exponential current in response, and an inductive degeneration compensator receiving exponential current and providing a control current to driver amplifier circuitry, thereby compensating for inductive degeneration due to at least one inductor in the driver amplifier circuitry. Control current passes from the inductive degeneration compensator to the driver amplifier circuitry.
    COPYRIGHT: (C)2011,JPO&INPIT

    摘要翻译： 要解决的问题：提供提供线性分贝增益控制的射频（RF）驱动放大器系统和方法。 解决方案：RF驱动放大器系统包括接收输入电压并基于接收的输入电压提供受控电流的线性跨导器，用于根据绝对温度从线性跨导器改变功率的温度补偿电路，指数电流控制器 接收功率根据温度变化并提供响应的指数电流，以及感应退化补偿器，其接收指数电流并向驱动器放大器电路提供控制电流，从而补偿由于驱动器放大器电路中的至少一个电感器引起的电感变性。 控制电流从感应退化补偿器传递到驱动器放大器电路。 版权所有（C）2011，JPO＆INPIT

    Agc circuit, radio equipment employing the same, and control method of agc circuit
    6.
    发明专利
    Agc circuit, radio equipment employing the same, and control method of agc circuit 审中-公开
    AGC电路，使用其的无线电设备以及AGC电路的控制方法

    公开(公告)号：JP2010081568A

    公开(公告)日：2010-04-08

    申请号：JP2008301126

    申请日：2008-11-26

    申请人： Kyocera Corp ,  京セラ株式会社

    发明人： KAWADA TOSHIHIKO

    IPC分类号： H03G1/04 ,  H03F1/30 ,  H03G3/20 ,  H03G3/30

    摘要： PROBLEM TO BE SOLVED: To provide an AGC (Automatic Gain Control) circuit performing stable temperature control by reducing errors, caused by the temperature correction for gain characteristics of AGC amplifiers.
    SOLUTION: The AGC circuit 11 includes a plurality of AGC amplifiers 12, 13 arrayed in series and controls in parallel gains of the plurality of AGC amplifiers 12, 13 in accordance with a common AGC voltage. The AGC circuit 11 further includes a linearity correction circuit 14 for correcting the AGC voltage in such a way that output characteristics from the plurality of AGC amplifiers 12, 13 become linear with respect to the AGC voltage.
    COPYRIGHT: (C)2010,JPO&INPIT

    摘要翻译： 要解决的问题：提供通过降低由AGC放大器的增益特性的温度校正引起的误差来执行稳定温度控制的AGC（自动增益控制）电路。 解决方案：AGC电路11包括串联排列的多个AGC放大器12,13，并根据公共AGC电压控制多个AGC放大器12,13的并联增益。 AGC电路11还包括用于校正AGC电压的线性校正电路14，使得来自多个AGC放大器12,13的输出特性相对于AGC电压成线性。 版权所有（C）2010，JPO＆INPIT

    Amplifier for audio
    8.
    发明专利
    Amplifier for audio 审中-公开
    音频放大器

    公开(公告)号：JP2009239505A

    公开(公告)日：2009-10-15

    申请号：JP2008081398

    申请日：2008-03-26

    申请人： Roland Corp ,  ローランド株式会社

    发明人： MAEDA YOSHIKI ,  NIWAYAMA SHIGEKI

    IPC分类号： H03F3/217 ,  H03G1/04

    摘要： PROBLEM TO BE SOLVED: To provide an amplifier for audio can suppress the occurrence of a power supply bus pumping phenomenon by preventing the enlargement of capacities in power supply smoothing elements to be used for a power supply circuit and also suppressing the deterioration in an amplified analog signal. SOLUTION: When the power supply bus pumping occurs and a positive power supply voltage +V and a negative power supply voltage -V are raised to exceed prescribed values, a low frequency signal included in the input analog signal is attenuated by a high-pass filter 5 and output to an amplifier circuit 3. Then, the voltage values of the positive power supply voltage +V and the negative power supply voltage -V are prevented from being raised. Consequently, the occurrence of the power supply bus pumping is suppressed without performing the enlargement of the capacities of smoothing capacitors C1, C2. In a state where the power supply bus pumping does not occur, the input analog signal is output to the amplifier circuit 3 without being attenuated by the high-pass filter 5. Thus, the deterioration in the amplified analog signal is suppressed. COPYRIGHT: (C)2010,JPO&INPIT

    摘要翻译： 要解决的问题：为了提供一种用于音频的放大器，可以通过防止电源电路中使用的电源平滑元件的容量的放大来抑制电源总线泵送现象的发生，并且还抑制 放大的模拟信号。

    解决方案：当电源总线泵送发生，正电源电压+ V和负电源电压-V升高到超过规定值时，包含在输入模拟信号中的低频信号衰减高 通过滤波器5并输出到放大器电路3.然后，防止正电源电压+ V和负电源电压-V的电压值升高。 因此，不进行平滑电容器C1，C2的容量的放大，抑制了电源总线泵送的发生。 在不发生电源总线泵送的状态下，输入模拟信号被输出到放大器电路3而不被高通滤波器5衰减。因此，放大的模拟信号的劣化被抑制。 版权所有（C）2010，JPO＆INPIT

    Variable gain amplifier circuit
    10.
    发明专利
    Variable gain amplifier circuit 审中-公开
    可变增益放大器电路

    公开(公告)号：JP2007235524A

    公开(公告)日：2007-09-13

    申请号：JP2006054557

    申请日：2006-03-01

    申请人： Matsushita Electric Ind Co Ltd ,  松下電器産業株式会社

    发明人： NAKAMURA MASANORI ,  MIYAZAKI TAKAHITO ,  KOMORI HIROSHI

    IPC分类号： H03G1/04 ,  H03G3/10

    摘要： PROBLEM TO BE SOLVED: To provide a variable gain amplifier circuit for which a change in input/output impedance which appears when the gain changes can be corrected.
    SOLUTION: In the variable gain amplifier circuit, a function circuit having capacitance function is connected to the input terminal of a transistor 101 for signal amplification. By controlling the function circuit having the variable capacitance function, a change can be corrected in the base-emitter capacitance value of the transistor for signal amplification when the gain changes, resulting in leading to suppression of a change in input/output impedance.
    COPYRIGHT: (C)2007,JPO&INPIT

    摘要翻译： 要解决的问题：提供一种可变增益放大器电路，其可以校正当增益改变时出现的输入/输出阻抗的变化。 解决方案：在可变增益放大器电路中，具有电容功能的功能电路连接到用于信号放大的晶体管101的输入端子。 通过控制具有可变电容功能的功能电路，当增益改变时，可以在用于信号放大的晶体管的基极 - 发射极电容值中校正改变，导致抑制输入/输出阻抗的变化。 版权所有（C）2007，JPO＆INPIT