Patent ID: 7995972
Filing Date: 2011-08-09
Classification: H03F

Abstract:
1. A semiconductor device for switching transmission and reception, comprising: a first switch provided between a first terminal connected to a transmission/reception antenna and a second terminal connected to a transmission circuit; and a second switch provided between said first terminal and a third terminal connected to a reception circuit, wherein said semiconductor device performs switching between a signal to be transmitted and a received signal through an ON/OFF operation of said first and second switches, and wherein said second switch is comprised of a single multi-gate transistor or a plurality of transistors connected in series, respective resistor elements are connected between a plurality of gate terminals of the multi-gate transistor or plurality of transistors and a control input terminal used commonly thereamong, and resistance values of the resistor elements are set such that the resistor element connected to the gate terminal closer to said first terminal has a larger resistance value.