| 摘要 |
<p>A high-frequency switch module for selectively connecting the transmitter or receiver circuit of a plurality of different transmitting and receiving systems comprises a first and second filter circuits with different pass bands; a first switch circuit connected with the first filter circuit for selectively connecting the transmitter or receiver circuit of the first transmitting and receiving system; and a second switch circuit connected with the second filter circuit for selectively connecting the transmitter circuits of the second and third transmitting and receiving systems, the receiver circuit of the second transmitting and receiving system, or the receiver circuit of the third transmitting and receiving system. The transmitter circuit of the second transmitting and receiving system is identical to that of the third transmitting and receiving system. The high-frequency switch module can be designed compact while providing desired electrical characteristics. The second and third transmitting and receiving systems can share some components of their transmitter circuits, resulting in a smaller and more lightweight portable communication device using such a high-frequency switch module.</p> |
