Semiconductor integrated circuit having isolated supply paths for circuit blocks
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United States of America Patent
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Jul 16, 1996
Grant Date -
N/A
app pub date -
Dec 14, 1994
filing date -
Dec 17, 1993
priority date (Note) -
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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.
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