A fully integrated Software-Defined FDD transceiver tunable from 0.3-to-1.6 GHz

An ideal Software Defined Radio (SDR) requires a reconfigurable, intergrated, widely-frequency-tunable transceiver able to support different RX/TX duplex schemes. Here we present an integrated transceiver capable of supporting both TDD and FDD operation with >25dB integrated RX-TX isolation from 0.3-1.6GHz without any off-chip switches or filters. The transceiver uses an artificial transmission line (TL) and distributed PA to separate TX and RX. TX noise in the RX band is further suppressed by >13dB an RX-tracking PA degeneration circuit.