An integrated circuit comprising a transceiver , the transceiver including a transformer , the transformer comprising: an input coupled to one or more primary windings of the transformer; a first differential output coupled to a first set of one or more secondary windings of the transformer; a second differential output coupled to a second, different set of one or more secondary windings of the transformer, wherein: the first differential output is coupled to a receive path of the transceiver; the second differential output is coupled to a transmit path of the transceiver; the receive path includes a switch that is switchable between: an ON state for coupling the receive path to the first differential output ; and an OFF state for decoupling the receive path from the first differential output ; and the switch is operable switch to said OFF state to decouple the receive path from the first differential output when the transmit path is active characterised in that : the integrated circuit further comprises a centre tap coupled to the first set of secondary winding(s), wherein the centre is operable to: connect to ground when the switch is in the ON state; and connect to a supply voltage of the integrated circuit or to a voltage intermediate the supply voltage and ground when the switch is in the OFF state. the transformer comprising: an input coupled to one or more primary windings of the transformer; a first differential output coupled to a first set of one or more secondary windings of the transformer; a second differential output coupled to a second, different set of one or more secondary windings of the transformer, an input coupled to one or more primary windings of the transformer; a first differential output coupled to a first set of one or more secondary windings of the transformer; a second differential output coupled to a second, different set of one or more secondary windings of the transformer, wherein: the first differential output is coupled to a receive path of the transceiver; the second differential output is coupled to a transmit path of the transceiver; the receive path includes a switch that is switchable between: an ON state for coupling the receive path to the first differential output ; and an OFF state for decoupling the receive path from the first differential output ; and the switch is operable switch to said OFF state to decouple the receive path from the first differential output when the transmit path is active the first differential output is coupled to a receive path of the transceiver; the second differential output is coupled to a transmit path of the transceiver; the receive path includes a switch that is switchable between: an ON state for coupling the receive path to the first differential output ; and an OFF state for decoupling the receive path from the first differential output ; and the switch is operable switch to said OFF state to decouple the receive path from the first differential output when the transmit path is active an ON state for coupling the receive path to the first differential output ; and an OFF state for decoupling the receive path from the first differential output ; and the switch is operable switch to said OFF state to decouple the receive path from the first differential output when the transmit path is active characterised in that : the integrated circuit further comprises a centre tap coupled to the first set of secondary winding(s), wherein the centre is operable to: connect to ground when the switch is in the ON state; and connect to a supply voltage of the integrated circuit or to a voltage intermediate the supply voltage and ground when the switch is in the OFF state. <EOS>