Wide common-mode differential receiver with precision input refe

Details Wide common-mode differential receiver with precision input refe Wide common-mode differential receiver with precision input refe

1998-05-29

2000-08-29

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 89, 327407, H03K 5153, H03K 1762

Patent

active

061114375

ABSTRACT:
A differential receiver having a precision input referred offset and a wide CMR, wherein a pair of differential-difference amplifiers are used as differential comparators. The differential-difference amplifiers are configured to allow a precision input-referred offset to be set by the use of two reference voltages. The differential comparators each have a common-mode range over a different portion of the rail-to-rail voltage range. A first one of these differential comparators is activated when the input common-mode voltage is above a threshold level. A second differential comparator is activated when the input common-mode voltage is below the threshold. The output of the differential comparator that is selected is to provide a comparison output signal, thereby achieving a wide CMR. The selection of either the first or second differential comparator is made by a selection circuit that includes a differential Schmitt Trigger and a multiplexer.

REFERENCES:
patent: 5416484 (1995-05-01), Lofstrom
patent: 5563598 (1996-10-01), Hickling
patent: 5796301 (1998-08-01), Tanabe et al.
patent: 5894284 (1999-04-01), Garrity et al.

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