Differential input buffer using local reference voltage and meth

Details Differential input buffer using local reference voltage and meth Differential input buffer using local reference voltage and meth

1998-01-30

1999-11-23

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 73, 327 77, 327 89, H03K 522

Patent

active

059907088

ABSTRACT:
A differential input buffer (14) and method of construction are provided. The differential input buffer (14) includes a differential amplifier (54, 56, 50, 52, 62, 64) connected to receive an input signal (IN). A local reference voltage generator (68, 70, 72) is connected to the differential amplifier (54, 56, 50, 52, 62, 64) and is connected to receive an external voltage reference (BLR) and to provide a local reference voltage (VREF) to the differential amplifier (54, 56, 50, 52, 62, 64). The local reference generator (68, 70, 72) is adjustable during construction to produce a desired level for the local reference voltage (VREF). The differential input buffer (14) also includes a hysteresis element (66, 74) that is connected to provide feedback to the differential amplifier (54, 56, 50, 52, 62, 64) and includes a buffer stage (76, 78, 80, 82, 84, 86) that is connected to receive an output of the differential amplifier (54, 56, 50, 52, 62, 64) and to drive an output signal (OUT). The buffer stage is also connected to the hysteresis element (66, 74) to provide a basis for the feedback to the differential amplifier (54, 56, 50, 52, 62, 64).

REFERENCES:
patent: 4438349 (1984-03-01), Shoji
patent: 4937476 (1990-06-01), Bazes
patent: 4958133 (1990-09-01), Bazes
patent: 5640104 (1997-06-01), Matsubara
patent: 5736871 (1998-04-01), Goto
patent: 5801553 (1998-09-01), Danstrom

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