Novel LNA-integrated bandpass switchplexer for highly integrated RF transceiver frontend design

In this work, novel LNA-integrated bandpass switchplexer is proposed, which integrates the functions of single-pole-double-throw (SPDT) RF switch, TX/RX bandpass filter, and the LNA in a single circuit. In this way, five functional blocks in a single-band time-division duplexing RF transceiver can be integrated into a single circuit, and the level of integration for RF frontend design can be largely improved. The redundancy in the conventional RF front-end design such as the duplication of impedance matching can thus be avoided. More compact circuit size and less mismatch loss can then be obtained.