Transceiver arrangement, communication device, and method

A method of controlling a transceiver arrangement, the method comprising:

• measuring amplitude at terminals of an input port or output port of the receiver;
• and
• adjusting an adaptive impedance of a balancing impedance such that the amplitude is reduced,
• wherein the transceiver arrangement comprises:
• a receiver arranged for frequency-division duplex communication with a communication network;
• a transmitter arranged for frequency-division duplex communication with the communication network;
• a transmission port for connecting to an antenna;
• the balancing impedance circuit arranged to provide the adaptive impedance arranged to mimic an impedance at the transmission port;
• a filtering arrangement, which comprises filters of a first type and filters of a second type, connecting the receiver, transmitter, transmission port and balancing impedance circuit;
• and
• a common-mode signal reduction circuit, wherein
• the filters of the first type are arranged to pass signals at transmitter frequency and attenuate signals at receiver frequency and are connected between the transmitter and the transmission port and between the receiver and the balancing impedance circuit;
• the filters of the second type are arranged to attenuate signals at transmitter frequency and pass signals at receiver frequency and are connected between the transmitter and the balancing impedance circuit and between the receiver and the transmission port;
• and
• the common-mode signal reduction circuit comprises an inverting amplifier, the input of the inverting amplifier is provided by a voltage division between a first and a second impedance where the first and second impedance have equal impedances, and the output of the amplifier is provided to junction of a third and a fourth impedance where the third and fourth impedances have equal impedances and the first and second impedances, and the third and fourth impedances, respectively, are connected in series between a filter of the first type and a filter of the second type.