Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Integrated structure
Patent
1999-04-15
2000-09-19
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Integrated structure
364491, 326 47, H01L 2500
Patent
active
061218278
ABSTRACT:
A mixed signal integrated circuit board having decreased sensitivity of analog circuitry to digital circuitry noise is disclosed. In the mixed-signal integrated board of the present invention, a new (second) analog ground is created. This new analog ground is not limited by the manufacturing specification of connectivity to the substrate of the circuit board and is thereby free of transient noise generated by digital components on the board. In a mixed-signal integrated circuit board of the present invention, the new analog ground becomes the preferred ground and is utilized in many sensitive analog applications including voltage and current measurements. The new analog ground is easy to create as it does not involved complicated circuitry. The new analog ground may be created even after the initial circuit schematics has been created.
REFERENCES:
patent: 5453713 (1995-09-01), Partovi et al.
patent: 5621347 (1997-04-01), Saito et al.
patent: 5900763 (1999-05-01), Rahim et al.
patent: 6031406 (2000-02-01), Drost et al.
Khoini-Poorfard Ramin
Lim Lysander B.
Callahan Timothy P.
Lucent Technologies - Inc.
Luu An T.
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