Output buffer circuit and method that compensate for operating c

Details Output buffer circuit and method that compensate for operating c Output buffer circuit and method that compensate for operating c

1998-01-09

2000-03-21

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327389, 327538, 323312, G05F 110

Patent

active

060407379

ABSTRACT:
The present invention provides improved output buffers for use on IC Chips. These output buffers incorporate a compensation circuit for compensating the performance characteristics of transistors included in the output buffers. The compensation circuit determines whether the output buffer is operating at a desired slew-rate. In response to this determination, the compensation circuit supplies a compensation voltage or voltages. The compensation voltages control a variable quantity of power delivered by a voltage controlled power source (VCPS). By increasing or reducing this power, the slew-rate of the output buffers are respectively increased or reduced. The compensation voltages maintain this slew-rate within narrow tolerances. This allows the improved output buffers of the present invention to meet very narrow input tolerances of circuitry coupled to receive signals from the IC Chip. The compensation circuit of the present invention is also beneficial for compensating various circuitry on an IC Chip, such as amplifier designs using constant current or power sources.

REFERENCES:
patent: 4766415 (1988-08-01), Dielacher
patent: 5001482 (1991-03-01), Chung et al.
patent: 5155385 (1992-10-01), Gotoh et al.
patent: 5668550 (1997-09-01), Coleman, Jr.
patent: 5774013 (1998-06-01), Groe

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