Patent ID: 7940080
Filing Date: 2011-05-10
Classification: H01L,H03K

Abstract:
1. A semiconductor integrated circuit comprising: a circuit block having an internal voltage line; an annular rail line forming a closed annular line around said circuit block and supplied with one of a power supply voltage and a reference voltage; and a plurality of switch blocks arranged around said circuit block along said annular rail line, the plurality of switch blocks each including a voltage line segment forming a part of said annular rail line and a switch for controlling connection and disconnection between said voltage line segment and said internal voltage line, wherein said plurality of switch blocks are standardized by having an identical size and including four different kinds of switch blocks for four respective sides of said circuit block, and wherein for said plurality of switch blocks, a number of switch blocks arranged on each side of said circuit block is determined such that the number of switch blocks is increased as impedance of wiring supplying one of the power supply voltage and the reference voltage to said circuit block as viewed from each of the four sides of said circuit block is decreased.