Patent ID: 7608922

Claim:
A semiconductor device comprising: a wiring substrate having a main surface and a back surface opposite to the main surface; a semiconductor chip mounted over the main surface of said wiring substrate, electrically connected to the wiring substrate, and having a first circuit portion for amplifying an inputted signal and a second circuit portion for converting a frequency of the signal supplied from the first circuit portion; and a plurality of external terminals provided over the back surface of said wiring substrate, wherein a first common conductor portion electrically connected to said first circuit portion to supply a GND potential to said first circuit portion and a second common conductor portion electrically connected to said second circuit portion to supply the GND potential to said second circuit portion are provided over said wiring substrate, and said first and second common conductor portions are separated from each other, wherein a plurality of low noise amplifiers to which signals at different frequencies are inputted are provided each as said first circuit portion in said semiconductor chip, and said first common conductor portion is disposed between each adjacent two of a plurality of wiring portions provided over the main surface of said wiring substrate correspondingly to said individual low noise amplifiers.