Patent ID: 7298600
Filing Date: 2007-11-20
Classification: H01L,H03F

Abstract:
1. A semiconductor integrated circuit device for use in a wireless communication mobile terminal device, comprising: a protective circuit which is provided a high frequency signal received by an antenna of the wireless communication mobile terminal device; an amplifying transistor which is coupled to the protective circuit and which amplifies the high frequency signal and outputs an amplified high frequency signal; and a reception mixer which converts a frequency of the amplified high frequency signal into a lower frequency, wherein the protective circuit, the amplifying transistor and the reception mixer are formed on a same semiconductor chip of the semiconductor integrated circuit device, wherein the protective circuit prevents electrostatic breakdown of the semiconductor chip, wherein the semiconductor chip includes a first voltage line which is supplied with a first voltage and a second voltage line which is supplied with a second voltage lower than the first voltage, wherein the protective circuit is arranged between the first voltage line and the second voltage line and includes a signal node which receives the high frequency signal, a first protection unit which allows an electric current flow from the first voltage line to the signal node and a second protection unit which allows an electric current flow from the signal node to the second voltage line, wherein the first protection unit includes a plurality of first diodes which are connected in series and are arranged between the first voltage line and the signal node, and wherein the second protection unit includes a plurality of second diodes which are connected in series and are arranged between the signal node and the second voltage line.