PROXIMITY WIRELESS TRANSMITTING/RECEIVING DEVICE

PROBLEM TO BE SOLVED: To make an antenna for a plurality of radio communication LSIs smaller by allowing it to be shared.SOLUTION: A proximity wireless transmitting/receiving device of an embodiment comprises: a first transmitting/receiving unit employing a first communication mode and including a first tuning circuit and a first modulating/demodulating circuit; a second transmitting/receiving unit employing a second communication mode and including a second tuning circuit and a second modulating/demodulating circuit; an antenna for inducing communication signals in the first and second communication modes; a switch unit for connecting the antenna and the first transmitting/receiving unit or connecting the antenna and the second transmitting/receiving unit; a reception determination unit for determining reception states of the first and second transmitting/receiving units; and a switch switching unit for controlling the switch unit depending on the determined result by the reception determination unit. 【課題】複数の無線通信ＬＳＩ用のアンテナを共用化可能にすることにより小型化する。【解決手段】実施形態の近接無線送受信装置は、第１の同調回路及び第１の変復調回路を含む第１の通信方式の第１の送受信部と、第２の同調回路及び第２の変復調回路を含む第２の通信方式の第２の送受信部と、前記第１及び第２の通信方式の通信信号が誘起するアンテナと、前記アンテナと前記第１の送受信部とを接続するか又は前記アンテナと前記第２の送受信部とを接続するためのスイッチ部と、前記第１及び第２の送受信部の受信状態を判定する受信判定部と、前記受信判定部の判定結果に応じて前記スイッチ部を制御するスイッチ切換部とを具備する。【選択図】図１