Integrated driver circuits having independently programmable pul

Details Integrated driver circuits having independently programmable pul Integrated driver circuits having independently programmable pul

1998-08-24

2000-09-05

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327437, 326 27, 326 85, 307 98, H03K 300

Patent

active

061148857

ABSTRACT:
Integrated driver circuits include a pull-up circuit having a first plurality of PMOS pull-up transistors therein which are selectively enabled by a first multi-bit impedance control signal. This first multi-bit impedance control signal is a function of a first variable resistance device. A pull-down circuit is also provided. The pull-down circuit has a first plurality of NMOS pull-down transistors therein which are selectively enabled by a second multi-bit impedance control signal. This second multi-bit impedance control signal is a function of a resistance of a second variable resistance device. The pull-up circuit and pull-down circuit have commonly connected outputs. In particular, the pull-up circuit has a first impedance which is a function of a digital value of the first multi-bit impedance control signal and the pull-down circuit has a second impedance which is a function of a digital value of the second multi-bit impedance control signal. Moreover, the first variable resistance device and the second variable resistance device may be external to the pull-up circuit and the pull-up circuit, respectively. The resistances of the first and second variable resistance devices may also be independently controllable as separate potentiometers.

REFERENCES:
patent: 4823029 (1989-04-01), Gabara
patent: 5097148 (1992-03-01), Gabara
patent: 5194765 (1993-03-01), Dunlop et al.
patent: 5243229 (1993-09-01), Gabara et al.
patent: 5254883 (1993-10-01), Horowitz et al.
patent: 5298800 (1994-03-01), Dunlop et al.
patent: 5606275 (1997-02-01), Farhang et al.
patent: 5666078 (1997-09-01), Lamphier et al.
Gabara et al., "Digitally Adjustable Resistors in CMOS for High-Performance Applications", IEEE Journal of Solid-State Circuits, vol. 27, No. 8, Aug. 1992, pp. 1176-1185.

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