公开(公告)号：US20140347142A1

公开(公告)日：2014-11-27

申请号：US13901335

申请日：2013-05-23

Applicant: QUALCOMM Incorporated

Inventor： Li-Chung Chang ,  Ehab A. Abdel Ghany ,  Ahmed A. Youssef

IPC: H03H7/42 ,  H03H7/01

CPC classification number: H04K3/228 ,  H03H7/0115 ,  H03H7/0184 ,  H03H7/07 ,  H03H7/1775 ,  H03H2007/013 ,  H03H2210/01 ,  H04B1/1036

Abstract: Techniques for providing low-cost and effective jammer rejection for a radio receiver. In an aspect, a notch filter is provided between a transformer and a differential mixer in the receiver. The notch frequency of the notch filter may be selected to correspond to an expected jammer frequency to effectively attenuate the jammer signal prior to down-conversion mixing by the mixer. The notch filter may be implemented using various techniques, e.g., an L-C combination having adjustable capacitance, and/or elliptic or Chebyshev filters.

Abstract translation: 为无线电接收机提供低成本和有效干扰抑制的技术。 在一方面，陷波滤波器设置在接收机中的变压器和差分混频器之间。 可以选择陷波滤波器的陷波频率以对应于预期的干扰频率，以在混频器进行下变频混频之前有效地衰减干扰信号。 陷波滤波器可以使用各种技术来实现，例如具有可调电容的L-C组合和/或椭圆形或切比雪夫滤波器。

公开(公告)号：US20140253242A1

公开(公告)日：2014-09-11

申请号：US13794110

申请日：2013-03-11

Applicant: QUALCOMM INCORPORATED

Inventor： Ahmed A. Youssef ,  Sherif Abdelhalem ,  Ehab A. Abdel Ghany ,  Li-Chung Chang

IPC: H03G3/30

CPC classification number: H03F1/223 ,  H03F1/08 ,  H03F1/56 ,  H03F3/189 ,  H03F3/45179 ,  H03F2200/492 ,  H03G1/0023

Abstract: Amplifiers with inductive degeneration and configurable gain and input matching are disclosed. In an exemplary design, an apparatus includes a gain transistor, an inductor, and an input matching circuit for an amplifier. The gain transistor has a variable gain determined based on its bias current. The inductor is coupled between the gain transistor and circuit ground. The input matching circuit is selectively coupled to the gain transistor based on the variable gain of the gain transistor. For example, the input matching circuit may be coupled to the gain transistor in a low-gain mode and decoupled from the gain transistor in the high-gain mode. In an exemplary design, the input matching circuit includes a resistor, a capacitor, and a second transistor coupled in series. The resistor is used for input matching of the amplifier. The second transistor couples or decouples the resistor to or from the gain transistor.

Abstract translation: 公开了具有感应退化和可配置增益和输入匹配的放大器。 在示例性设计中，装置包括用于放大器的增益晶体管，电感器和输入匹配电路。 增益晶体管具有基于其偏置电流确定的可变增益。 电感器耦合在增益晶体管和电路接地之间。 基于增益晶体管的可变增益，输入匹配电路选择性地耦合到增益晶体管。 例如，输入匹配电路可以以低增益模式耦合到增益晶体管，并在高增益模式中与增益晶体管去耦。 在示例性设计中，输入匹配电路包括串联耦合的电阻器，电容器和第二晶体管。 该电阻用于放大器的输入匹配。 第二个晶体管将电阻器耦合或去耦合增益晶体管。