Semiconductor integrated circuit having isolated supply paths fo

Details Semiconductor integrated circuit having isolated supply paths fo Semiconductor integrated circuit having isolated supply paths fo

1994-12-14

1996-07-16

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Integrated structure

257371, 348312, 377 61, H01L 27085

Patent

active

055370756

ABSTRACT:
Circuit blocks to which reference clock signals with different frequencies are input can be fabricated on the same substrate. A supply path of a supply voltage applied to a source region of a first PMOSFET and a first N-type well region, and a supply path of a supply voltage applied to a source region of a second PMOSFET and a second N-type well region, are isolated from each other by the first and second N-type well regions, respectively. A supply path of a supply voltage applied to a source region of a first NMOSFET and a first P-type well region, and a supply path of a supply voltage applied to a source region of a second NMOSFET and a second P-type well region, are isolated from each other by the first and second P-type well regions, respectively. The respective isolation of the supply voltage supplied path ensures that substrate potential fluctuations caused by the different frequencies do not result in a beat (a wave form distortion) being present on outputs of the circuit blocks.

REFERENCES:
patent: 4096397 (1978-06-01), Dreiling
patent: 4468574 (1984-08-01), Engeler et al.
patent: 5311048 (1994-05-01), Takahashi et al.
patent: 5323043 (1994-06-01), Kimura et al.
patent: 5386135 (1995-01-01), Nakazato et al.
patent: 5399915 (1995-03-01), Yahata

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