Circuit and method of reducing cross-talk in an integrated circu

Details Circuit and method of reducing cross-talk in an integrated circu Circuit and method of reducing cross-talk in an integrated circu

1994-10-11

1999-05-04

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Clock or pulse waveform generating

327310, 327311, 327551, 327565, 327379, 257544, 257565, H01L 2126

Patent

active

059007630

ABSTRACT:
An integrated circuit (10) provides analog and digital circuitry on a common substrate (12). A first digital circuit (14) operates in combination with an analog circuit (18) to perform a useful function. A second duplicate digital circuit (26) is disposed adjacent to the first digital circuit and operates out-of-phase with respect to the first digital circuit. The second duplicate digital circuit introduces voltage spikes equal and opposite to the voltage spikes introduced into the substrate by the first digital circuit. The equal and opposite voltage spikes tend to cancel and thereby minimize cross-talk between the digital and analog circuits. A guard ring (16,28) surrounds each of the first and second digital circuits and the analog circuit to reduce voltage spikes into the substrates. By minimizing cross-talk, the analog circuit operates without interference from the digital circuits.

REFERENCES:
patent: 4597805 (1986-07-01), Mohan Rao
patent: 5027183 (1991-06-01), Dreps

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