Patent ID: 8666326

Claim:
A filter shared by a radio frequency (RF) front end of a RF receiver and a RF front end of a RF transmitter, comprising: a first stage of amplifiers coupled to a plurality of input receiving nodes and a plurality of input transmitting nodes; a second stage of amplifiers coupled to corresponding outputs of the first stage of amplifiers; a first set of transmitting switches coupled between the plurality of input transmitting nodes and corresponding inputs of the first stage of amplifiers; a first set of receiving switches coupled between the plurality of input receiving nodes and the corresponding inputs of the first stage of amplifiers; a second set of transmitting switches coupled between the corresponding outputs of the first stage of amplifiers and corresponding inputs of the second stage of amplifiers; a second set of receiving switches coupled between the corresponding outputs of the first stage of amplifiers and the corresponding inputs of the second stage of amplifiers; and a plurality of output nodes coupled to corresponding outputs of the second stage of amplifiers, wherein the first set of transmitting switches and the first set of receiving switches are configured to be programmed such that the filter operates in a first mode for receiving RF signals by the RF receiver or the filter operates in a second mode for transmitting RF signals from the RF transmitter.