Apparatus and methods for biasing a power amplifier
    1.
    发明授权
    Apparatus and methods for biasing a power amplifier 有权
    用于偏置功率放大器的装置和方法

    公开(公告)号:US08587377B2

    公开(公告)日:2013-11-19

    申请号:US13309349

    申请日:2011-12-01

    IPC分类号: H03G3/30

    摘要: Apparatus and methods for biasing a power amplifier are disclosed. In one embodiment, a power amplifier system includes a power amplifier configured to amplify a radio frequency (RF) signal and a bias control circuit for generating a bias current for the power amplifier. The bias control circuit is configured to receive an envelope of the RF signal and to change an amplitude of the bias current based at least in part on the envelope.

    摘要翻译: 公开了用于偏置功率放大器的装置和方法。 在一个实施例中,功率放大器系统包括被配置为放大射频(RF)信号的功率放大器和用于产生功率放大器的偏置电流的偏置控制电路。 偏置控制电路被配置为接收RF信号的包络并且至少部分地基于包络来改变偏置电流的幅度。

    Variable-slope variable-gain amplifier
    6.
    发明授权
    Variable-slope variable-gain amplifier 有权
    可变斜率可变增益放大器

    公开(公告)号:US06542029B1

    公开(公告)日:2003-04-01

    申请号:US09686669

    申请日:2000-10-11

    IPC分类号: H03G320

    CPC分类号: H03G3/3036

    摘要: A system for varying output power of variable-gain amplifiers (VGA) allows for varying the output power transfer function, thus varying the gain, and, hence, the resolution of the output power of the VGA. The preferred embodiment comprises a variable-slope VGA (VSVGA) circuit configured to operate within a closed-loop power-controlled CDMA handset. The VSVGA circuit manipulates the input control voltage of the VGA, thereby, adjusting the gain of the amplifier by varying the slope of a line which models the amplifier output transfer function. Varying gain of the VGA provides for a varying resolution in the VGA amplifier output transfer function. This variation allows for compatibility of a single CDMA handset with different industry standards.

    摘要翻译: 用于改变可变增益放大器(VGA)的输出功率的系统允许改变输出功率传递函数,从而改变增益,并因此改变VGA的输出功率的分辨率。 优选实施例包括可变斜率VGA(VSVGA)电路,其被配置为在闭环功率控制的CDMA手持机内操作。 VSVGA电路操纵VGA的输入控制电压,从而通过改变对放大器输出传递函数建模的线的斜率来调节放大器的增益。 VGA的不同增益提供了VGA放大器输出传递功能的不同分辨率。 这种变化允许单个CDMA手机与不同行业标准的兼容性。

    Power amplifier driver system for wireless handset
    8.
    发明授权
    Power amplifier driver system for wireless handset 有权
    无线手机的功率放大器驱动系统

    公开(公告)号:US06339361B1

    公开(公告)日:2002-01-15

    申请号:US09328927

    申请日:1999-06-09

    IPC分类号: H03G310

    摘要: A driver system for a power amplifier in a wireless communication handset. The driver system includes a driver and a current source. The driver drives the power amplifier at a level of linearity determined responsive to a variable input bias current provided by the current source. The current source varies the bias current, and thus the degree of linearity provided, responsive to the desired output power of the handset.

    摘要翻译: 一种用于无线通信手机中的功率放大器的驱动器系统。 驱动器系统包括驱动器和电流源。 驱动器以响应于由电流源提供的可变输入偏置电流确定的线性度驱动功率放大器。 电流源根据手机所需的输出功率改变偏置电流,从而提供线性度。