公开(公告)号：US20140179253A1

公开(公告)日：2014-06-26

申请号：US13725228

申请日：2012-12-21

Applicant: QUALCOMM INCORPORATED

Inventor： Prasad Srinivasa Siva Gudem ,  Li Liu ,  Frederic Bossu

IPC: H03D7/14

CPC classification number: H03D7/1466 ,  H04B1/005 ,  H04B1/0064 ,  H04B7/0871 ,  Y02D70/40 ,  Y02D70/444

Abstract: A multi-mode receiver is disclosed that is reconfigurable to share a local oscillator signal in diversity mode to save power consumption. In an exemplary embodiment, an apparatus includes a primary receiver having a primary mixer configured to down-convert a primary signal and a secondary mixer configured to down-convert a secondary signal in carrier aggregation mode. The apparatus also includes a supplemental mixer that uses a shared primary local oscillator (LO) signal generated by a shared primary frequency synthesizer in diversity mode to reduce power consumption. The apparatus further includes a controller configured to disable the secondary mixer and to enable the supplemental mixer to down-convert the secondary signal when operating in the diversity mode.

Abstract translation: 公开了一种多模式接收机，其可重构以在分集模式下共享本地振荡器信号以节省功耗。 在一个示例性实施例中，一种装置包括主接收机，其具有被配置为对主信号进行下变频的主混合器和被配置为在载波聚合模式中对二级信号进行下变频的二级混合器。 该装置还包括补充混频器，其使用由分集模式中由共享主频率合成器产生的共享主本地振荡器（LO）信号以减少功耗。 该装置还包括控制器，其被配置为在分集模式下操作时禁用辅助混合器并且使辅助混频器能够对次级信号进行下变频。

公开(公告)号：US20130336143A1

公开(公告)日：2013-12-19

申请号：US13968763

申请日：2013-08-16

Applicant: Qualcomm Incorporated

Inventor： Ojas Mahendra Choksi ,  Frederic Bossu

IPC: H04L5/14 ,  H03M1/66

CPC classification number: H04L5/1461 ,  H03D3/009 ,  H03M1/1019 ,  H03M1/66 ,  H04L27/0014 ,  H04L2027/0016 ,  H04L2027/0018 ,  H04L2027/0024

Abstract: Techniques are provided for reducing mismatch between the in-phase (I) and quadrature (Q) channels of a communications transmitter or receiver. In an exemplary embodiment, separate voltages are applied to bias the gates or bulks of the transistors in a mixer of the I channel versus a mixer of the Q channel. In another exemplary embodiment, separate voltages are applied to bias the common-mode reference voltage of a transimpedance amplifier associated with each channel. Techniques are further provided for deriving bias voltages to minimize a measured residual sideband in a received or transmitted signal, or to optimize other parameters of the received or transmitted signal. Techniques for generating separate bias voltages using a bidirectional and unidirectional current digital-to-analog converter (DAC) are also disclosed.