Attenuating local signal leakage in a TDD system by modifying a frequency response of a filter component on a transmit circuit pathway during reception mode

摘要

Apparatus and method for Time Division Duplex (TDD) communication comprising a first circuit pathway for transmission of a first Radio Frequency (RF) signal, the first RF signal being generated based on a signal from a Voltage controlled oscillator (VCO) 610, the first circuit pathway comprising a filter component 614, a second pathway for reception of a second RF signal, and control circuitry, wherein said filter component is arranged to receive, during at least a portion of a reception mode, local signal leakage resulting from at least the signal from the VCO, wherein the second RF signal and the signal from the VCO comprise a common frequency component, and wherein the control circuitry is arranged to control, during at least a portion of a reception mode, said filter component to modify a frequency response of the filter component to attenuate at least said common frequency component.