Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Integrated structure
Patent
1994-05-06
1995-09-26
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Integrated structure
257519, 257552, H01L 2706
Patent
active
054537134
ABSTRACT:
An integrated circuit chip has both digital and analog circuit functions, with one or more islands for isolating the analog functions from noise caused by the digital functions. An island is defined by a surrounding heavily-doped region in the face of the chip. The voltage supplies for an analog island are isolated from the digital supply voltage for high frequencies by using resistive decoupling in series along with capacitive coupling to ground. Similarly, series resistive decoupling and capacitive coupling to ground are employed for the analog input signal lines going to the island. Analog signals generated within the island are coupled to the area outside the island on the chip face by either converting to digital in an A-to-D converter, or by a differential arrangement which accounts for differences that may exist between digital and analog supply voltages. The differential circuit may have a pair of matched inputs, one side supplied by the analog voltage supply and the other by the digital voltage supply, and a differential amplifier generating the output signal and also fed back to the one side of the matched input.
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patent: 5132555 (1992-07-01), Takahashi
patent: 5212458 (1993-05-01), Fitzpatrick et al.
Barber Andrew J.
Partovi Hamid
Callahan Timothy P.
Casey Mark J.
Digital Equipment Corporation
Fisher Arthur W.
Maloney Denis G.
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