RF switch for transmitting / receiving antenna

Abstract

Abstract Translated from Japanese (57)【要約】 【目的】 回路構成を大型化することなくスイッチング 素子で発生する信号歪みを低減する。 【構成】 ＲＦスイッチ１はＦＥＴ２１とコイルＬ１と の並列回路からなる送信側の第１スイッチ回路Ｓ１とＦ ＥＴ２２、コイルＬ２及びコンデンサＣ１の直並列回路 からなる受信側の第２スイッチ回路Ｓ２とから構成さ れ、同一周波数で送受信される無線通信機とアンテナ２ との接続を送受に応じて切り換える。ＦＥＴ２１，２２ はＶ G 端子から入力されるパルス列信号により同位相で オン・オフ駆動され、ＦＥＴ２１，２２がオン状態のと き、第２スイッチ回路Ｓ２は等価的に通信周波数で並列 共振するコンデンサＣ１とコイルＬ２及び内部インダク タンスＬ４の直列回路との並列共振回路となり、送信信 号及び受信信号のＲｘ端子への伝送が阻止されて送信期 間となる。送信期間ではＦＥＴ２１，２２が共にオン状 態となり、該ＦＥＴ２１，２２で発生する信号歪みが低 減される。 (57) [Abstract] [Purpose] To reduce the signal distortion generated in switching elements without increasing the size of the circuit configuration. [Structure] The RF switch 1 includes a first switch circuit S1 and a first switch circuit S1 on the transmission side, which are parallel circuits of a FET 21 and a coil L1. The wireless communication device and the antenna 2 which are composed of the ET22, the coil L2, and the second switch circuit S2 on the reception side which is a serial-parallel circuit of the capacitor C1 and are transmitted and received at the same frequency. The connection with and is switched according to transmission and reception. FET 21,22 Is on / off driven in the same phase by a pulse train signal input from the V G terminal, and when the FETs 21 and 22 are on, the second switch circuit S2 equivalently resonates in parallel at the communication frequency with the capacitor C1, the coil L2, and It becomes a parallel resonance circuit with the series circuit of the internal inductance L4, and transmission of the transmission signal and the reception signal to the Rx terminal is blocked, and the transmission period starts. In the transmission period, the FETs 21 and 22 are both turned on, and the signal distortion generated in the FETs 21 and 22 is reduced.

Inventors

• 👤 Yoshihiro Yamaguchi
• 👤 喜弘 山口
• 👤 Kazuya Kawabata
• 👤 一也 川端

Bibliographic Details