公开(公告)号：US08120426B1

公开(公告)日：2012-02-21

申请号：US12820807

申请日：2010-06-22

申请人： Marcus Granger-Jones ,  Jim Connelly

发明人： Marcus Granger-Jones ,  Jim Connelly

IPC分类号： H03F3/45

CPC分类号： H03F1/0277 ,  H03F1/3205 ,  H03F3/189 ,  H03F3/211 ,  H03F3/245 ,  H03F3/45183 ,  H03F3/4565 ,  H03F3/72 ,  H03F2200/171 ,  H03F2200/294 ,  H03F2200/336 ,  H03F2200/405 ,  H03F2203/21136 ,  H03F2203/21142 ,  H03F2203/45418 ,  H03F2203/45434 ,  H03F2203/45594 ,  H03F2203/45686 ,  H03F2203/45702 ,  H03F2203/45726

摘要： A transconductor stage is a linearized class AB amplifier having embedded noise filtering that enables a biasing of an in-phase/quadrature (I/Q) modulator core with a low quiescent current. Linearization of the transconductor stage is increased by introducing a small amount of negative feedback into the transconductor stage via a feedback circuitry and an error amplifier. A dominant open loop pole in a path between the error amplifier and an output stage of the transconductor stage forms a dominant pole low-pass filter. A low-pass filter transfer function created when a loop including the feedback circuitry is closed attenuates noise introduced by baseband circuitry that supplies baseband signals to the transconductor stage. A master output stage biases a plurality of slave output stages that are in parallel with the master output stage. Each slave output stage is coupled to an individual modulator core such as a Gilbert cell mixer core.

摘要翻译： 跨导级是具有嵌入式噪声滤波的线性化AB类放大器，其能够以低静态电流偏置同相/正交（I / Q）调制器核。 通过经由反馈电路和误差放大器将少量的负反馈引入跨导级来增加跨导级的线性化。 误差放大器与跨导级级输出级之间的路径中的主要开环极点形成主极低通滤波器。 当包括反馈电路的环路闭合时产生的低通滤波器传递函数会衰减由基带电路引入的噪声，该基带电路将基带信号提供给跨导级。 主输出级偏置与主输出级并联的多个从输出级。 每个从输出级耦合到诸如吉尔伯特单元混频器核心的单独调制器核心。