公开(公告)号：US09184707B2

公开(公告)日：2015-11-10

申请号：US13899091

申请日：2013-05-21

Applicant: QUALCOMM Incorporated

Inventor： Rajagopalan Rangarajan ,  Chirag D Patel

IPC: H03F3/68 ,  H03F3/217 ,  H03F3/72 ,  H03G1/00 ,  H03G3/30

CPC classification number: H03F3/2171 ,  H03F3/72 ,  H03G1/0029 ,  H03G1/0088 ,  H03G3/3052

Abstract: An amplifier having a switchable common gate gain buffer is disclosed. In an exemplary embodiment, an apparatus includes a plurality of selectable gain channels that provide constant input impedance at a common input to receive an input signal and generate an output signal having at least one of selected gain and current characteristics. At least two gain channels utilize transistors having different transconductance values. The apparatus also includes at least one impedance network coupled to at least one gain channel to provide the constant input impedance.

Abstract translation: 公开了具有可切换公共栅极增益缓冲器的放大器。 在示例性实施例中，一种装置包括多个可选择的增益通道，其在公共输入处提供恒定的输入阻抗以接收输入信号并产生具有选定的增益和电流特性中的至少一个的输出信号。 至少两个增益通道利用具有不同跨导值的晶体管。 该装置还包括耦合到至少一个增益通道以提供恒定输入阻抗的至少一个阻抗网络。