Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Signal level or switching threshold stabilization
Patent
1993-08-31
1995-09-05
Westin, Edward P.
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Signal level or switching threshold stabilization
326 78, 326 67, 326 26, H03K 19018, H03K 190175
Patent
active
054481830
ABSTRACT:
A semiconductor integrated circuit device has a first ground to which a first circuit is connected and whose level is fluctuate due to noise and a second ground to which a second circuit, which provides an output to the first circuit, is connected and whose level is stable. The semiconductor integrated circuit device includes a fluctuation detecting unit for detecting a fluctuation in the level of the first ground according to the level of the second ground serving as a reference; and a level controlling unit for controlling the level of the output of the second circuit, to cancel the fluctuation detected by the fluctuation detecting unit. The semiconductor integrated circuit device detects a fluctuation in the level of the first ground, which is easily affected by noise, according to the level of the second ground, which is stable, and controls the level of the output of the second circuit, to cancel the detected fluctuation. Consequently, this semiconductor integrated circuit device reduces the influence of noise and prevents malfunctions.
REFERENCES:
patent: 5049763 (1991-09-01), Rogers
patent: 5149991 (1992-09-01), Rogers
patent: 5153457 (1992-10-01), Martin et al.
patent: 5184034 (1993-02-01), Ohannes et al.
patent: 5204554 (1993-04-01), Ohannes et al.
Fujitsu Limited
Kyushu Fujitsu Electronics Limited
Santamauro Jon
Westin Edward P.
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