Patent ID: 7348856
Filing Date: 2008-03-25
Classification: H01L,H03F

Abstract:
1. A semiconductor device, comprising: a plurality of amplifying stages each comprising amplifier circuits; and secondary circuits, said all amplifying stages and said secondary circuits being provided over a same semiconductor chip, wherein the plurality of amplifying stages are respectively formed of field effect transistors placed over a semiconductor substrate of silicon of the semiconductor chip, wherein the amplifier circuits are disposed on a periphery of a main surface of the semiconductor chip, and wherein the secondary circuits are placed inside the periphery of the main surface of the semiconductor chip, and wherein a resistivity of the semiconductor substrate is smaller than 10 mΩ·cm, and wherein the field effect transistors are respectively configured as horizontal type field effect transistors having respective sources of the field effect transistors electrically connected to the semiconductor substrate through semiconductor regions and electrically connected to a fixed potential via an electrode over a back surface of the semiconductor substrate.