Front-end module comprising an ebd circuit, telecommunication device comprising the front-end module and method for operating them

Abstract

The present disclosure relates to a front-end module for a telecommunication device with an EBD circuit comprising a hybrid transformer for coupling via a transmit port to the telecommunication device transmitting a first frequency transmit signal, to an antenna, via a receive port to the telecommunication device receiving a second frequency receive signal, and to a tunable impedance circuit. In a first configuration the EBD circuit is configured to isolate the transmit port from the receive port at the first frequency, and the FEM comprises a first filter at the transmit port for attenuating the transmit signal with a predetermined amount at the second frequency. In a second configuration the EBD circuit is configured to isolate the transmit port from the receive port at the second frequency, and the FEM comprises a second filter at the receive port for attenuating the receive signal a predetermined amount at the first frequency.