Patent ID: 7773545

Claim:
A full division duplex system, comprising: a receiver, receiving an inbound RF signal of a first band to generate an inbound baseband signal; a transmitter, up converting an outbound baseband signal by an oscillation signal to generate an outbound RF signal of a second band for transmission; and an auxiliary circuit, coupled to the receiver and transmitter, calculating leakages from the outbound RF signal to generate a blocker replica, comprising: a first low noise amplifier (LNA), coupled to a non-conductive coupling path extended from the input of receiver, collecting leakages from the outbound RF signal to produce an induction signal; a first down converter, down converting the induction signal by the oscillation signal to generate a preliminary baseband signal; an adjustment circuit, adjusting phase, gain and DC offset of the preliminary baseband signal to output an adjusted baseband signal; an up converter, up converting the adjusted baseband signal by the oscillation signal to generate the blocker replica; wherein the inbound baseband signal is generated from a subtraction of the inbound RF signal and the blocker replica; and a buffer, buffering the oscillation signal from the transmitter for use of the up converter and first down converter.