Patent ID: 8244199

Claim:
A semiconductor device comprising an antenna switch having a transmission terminal, an antenna terminal, and a reception terminal, the antenna switch including: (a) a plurality of first MISFETs coupled in series between the transmission terminal and the antenna terminal; (b) a plurality of second MISFETs coupled in series between the reception terminal and the antenna terminal; (c) a plurality of third MISFETs coupled in series between the transmission terminal and a GND terminal; and (d) a fourth MISFET coupled between the reception terminal and the GND terminal, wherein each of the first MISFET, the second MISFET, and the fourth MISFET is comprised of a low voltage MISFET, while the third MISFET is comprised of a high voltage MISFET whose breakdown voltage between a source region and a drain region is higher than that of the low voltage MISFET, and wherein a number of the third MISFETs coupled in series between the transmission terminal and the GND terminal is fewer than a number of the second MISFETs coupled in series between the reception terminal and the antenna terminal.