Semiconductor integrated circuit device having a wiring layout t

Details Semiconductor integrated circuit device having a wiring layout t Semiconductor integrated circuit device having a wiring layout t

1986-04-08

1990-10-23

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Multiplex

341136, 341155, H03M 114

Patent

active

049655779

ABSTRACT:
A semiconductor circuit is constructed of a digital signal input circuit and an analog signal input circuit to be fed with an analog signal through a multiplexer. An analog signal wiring layer to be coupled to the input terminal of the analog signal input circuit is made not to intersect any digital signal wiring layer. As a result, an undesirable coupling capacitance to be formed by the intersecting wiring layers, if any, is not coupled to the analog signal wiring layer. Because of the absence of the undesirable coupling capacitance it is possible to substantially reduce the crosstalk of the digital signal from the digital signal wiring layer to the analog signal wiring layer.

REFERENCES:
patent: 3849775 (1974-11-01), Buchanan et al.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, pp. I-28 to I-32; II-155 to II-168; III-52 & III-53.

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