A widely tunable active duplexing transceiver with same-channel concurrent RX/TX and 30dB RX/TX isolation

We present a widely tunable passive mixer first duplexing transceiver which employs baseband noise-canceling, duplexing LNAs. The LNAs buffer transmitted signals to the mixer while canceling those signals in receive path. The transmitted signals are up-converted by the same mixer used for receiver down-conversion. The transceiver operates over a frequency range of 0.1-1.5GHz with -18dBm transmitted power. A 33dB linear isolation between receive and transmit (separated by 135kHz) as well as suppression of transmit-induced noise and nonlinearity are achieved.