RF transceiver and modem comprising such a transceiver

摘要

A LTE compliant RF transceiver includes at least one transmit path and at least two receive paths. A switching arrangement connected between a transmit PLL synthesizer and at least one transmit path as well as between a receive PLL synthesizer and at least two receive paths allows the transmit PLL synthesizer to selectively be connected to the receive side of the transceiver as well as the receive PLL synthesizer to selectively be connected to the transmit side of the transceiver, thereby considerably increasing flexibility of the RF transceiver which enables both speed-up of handover procedures and power savings. A modem including the transceiver is also provided.

主权项

1. An RF transceiver for an LTE compliant communication device, comprising a transmit side with a transmit PLL synthesizer, and a receive side with a receive PLL synthesizer, said transmit side further comprising at least one transmit path including a transmit mixer unit and a filter unit, and said receive side further comprising at least two receive paths, each path including a respective receive mixer unit and filter unit, said transmit PLL synthesizer being connected to the transmit mixer unit and operable to provide a carrier frequency for said at least one transmit path, and said receive PLL synthesizer being connectable to the receive mixer unit and operable to provide a carrier frequency for said at least two receive paths, wherein:
the transmit PLL synthesizer is connectable to the transmit mixer unit via a switching arrangement, the receive PLL synthesizer is connectable to at least one of the receive mixer units via the same switching arrangement, and said switching arrangement being operable to selectively connect said transmit PLL synthesizer to said at least one receive mixer unit and to selectively connect said receive PLL synthesizer to said transmit mixer unit, said switching arrangement further being operable to connect said receive PLL synthesizer to a first receive mixer unit of a first receive path of the at least two receive paths and to simultaneously connect the transmit PLL synthesizer to a second receive mixer unit of a second receive path of the at least two receive paths.