Method and apparatus to improve immunity to common-mode noise

Details Method and apparatus to improve immunity to common-mode noise Method and apparatus to improve immunity to common-mode noise

1996-12-12

1999-07-06

Le, Dinh

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327306, 327312, 327319, 327321, 327382, 327 52, 327 90, 327310, H03K 508

Patent

active

059202238

ABSTRACT:
The present invention provides a method and apparatus for improving immunity to common mode noise. The present invention prevents common mode noise from exceeding acceptable limits. The present invention is also useful to prevent common mode noise from being converted to differential mode noise by the action of parasitic diodes. One embodiment of the present invention bleeds charge off two differential lines such that the relative voltage differential is maintained, for example during a memory read, until at least one of the lines is low enough that the maximum possible upward noise (common+differential) is insufficient to turn on the parasitic diodes coupled to the positive voltage supply, leaving enough margin on the differential signal to allow a sensing circuit to accurately sense the differential signal.

REFERENCES:
patent: 4471451 (1984-09-01), Schenck
patent: 5587681 (1996-12-01), Fobbester
patent: 5675392 (1997-10-01), Nayebi et al.

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