Patent ID: 9049664
Filing Date: 2015-06-02
Classification: H03G,H04W,Y02D

Abstract:
1. A wireless communications circuit, comprising: a transceiver; a power amplifier module, comprising a plurality of power amplifiers coupled to the transceiver; a filter module, comprising a plurality of filters coupled to the power amplifier module, for filtering at least a portion of outputs of the power amplifiers; an antenna switching module, coupled between the filter module and an antenna; a tunable matching network, coupled between the antenna and the antenna switching module; a baseband circuit, coupled to the tunable matching network, for generating a control signal to the tunable matching network to adjust an impedance of the tunable matching network, wherein the impedance of the tunable matching network is adjusted to be different values under different operating conditions of the wireless communications circuit; and an impedance detector, for detecting a load impedance of the antenna switching module to generate a detecting result; wherein the baseband circuit generates the control signal to the tunable matching network to adjust the impedance of the tunable matching network according to the detecting result.