Power supply dependent input buffer

Details Power supply dependent input buffer Power supply dependent input buffer

1992-09-29

1994-05-03

Sikes, William L.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

3072966, 3072957, 307494, 307570, 307446, H03K 301, H03K 1760, H03K 1902, G06G 712

Patent

active

053090390

ABSTRACT:
A power supply dependent input buffer (20) having a differential amplifier (22), emitter-follower transistors (29 and 32), level shifting resistors (30 and 33), and power supply dependent current sources (31 and 34) receives an ECL input signal referenced to a positive power supply voltage and provides buffered level shifted signals referenced to ground. The current sources (31 and 34) receive a power supply dependent bias voltage that changes in relation to a change in the positive power supply voltage. In turn, the voltage drop across the resistors (30 and 33) changes with respect to the positive power supply voltage such that the buffered level shifted signals are constant with respect to ground. The power supply dependent input buffer (20) is for use at low power supply voltages (such as 3.3 volts), resulting in low power consumption and wider margins on following stages, such as a level converter.

REFERENCES:
patent: 4806799 (1989-02-01), Pelley, III et al.
patent: 4902915 (1990-02-01), Tran
patent: 4965469 (1990-10-01), Konodoh et al.
patent: 5043602 (1991-08-01), Flannagan
patent: 5059829 (1991-10-01), Flannagan et al.
patent: 5068553 (1991-11-01), Love
patent: 5113095 (1992-05-01), Huehne
patent: 5117177 (1992-05-01), Eaton, Jr.

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