Diversity receiver with shared local oscillator signal in diversity mode

摘要

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.

主权项

1. An apparatus comprising:
a primary receiver having a primary mixer configured to down-convert a primary signal and a supplemental mixer configured to down-convert a secondary signal, wherein the primary mixer and the supplemental mixer share a primary local oscillator (LO) signal; a secondary receiver having a secondary mixer configured to down-convert the secondary signal; a controller configured to enable the supplemental mixer to down-convert the secondary signal when operating in a diversity mode; and a selector having inputs configured to receive a supplemental baseband signal from the supplemental mixer and a secondary baseband signal from the secondary mixer, the selector configured to couple one of its inputs to a secondary baseband filter (BBF) based on a select signal from the controller.