公开(公告)号：JPH1145980A

公开(公告)日：1999-02-16

申请号：JP5978898

申请日：1998-03-11

Applicant: ST MICROELECTRON INC

Inventor： BRADY JAMES

IPC: H01L27/04 ,  G06F1/18 ,  H01L21/822 ,  H03B1/04 ,  H03B5/32 ,  H03H7/01

Abstract: PROBLEM TO BE SOLVED: To provide a technique for reducing noise in a small-current low frequency circuit provided on a large current high frequency integrated circuit chip. SOLUTION: Components which are affected by noise in a small-current low frequency circuit 62 are positioned outside an integrated circuit chip 52 as an off-chip array. An exclusive power reference line VSS( REF) is wired as extended from a power bus in the integrated circuit chip via a tap. The reference line VSS( REF) is led out from an inner power bus of an on-chip via a tap at a physical position adjacent to the small current low frequency circuit and then routed to the off-chip. Components which are affected by noise are provided between the small current low frequency circuit 62 and the reference line VSS( REF) . In this case, a noise difference between power supplied to the small current low-frequency circuit of the off-chip and power supplied to the noise- affected components can be minimized.