Process compensated integrated circuit output driver

Details Process compensated integrated circuit output driver Process compensated integrated circuit output driver

1996-06-14

1998-06-02

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327170, 327206, 327437, 326 87, H03K 300

Patent

active

057606188

ABSTRACT:
An integrated circuit output driver which reduces the effect of power supply and/or integrated circuit fabrication process variations on signal propagation delay. The output driver produces an output signal V.sub.out as an increased drive strength replica of an input signal V.sub.in. A pre-driver receives V.sub.in and produces an intermediate, inverted replica V.sub.int thereof. A driver is electrically connected to the pre-driver's output to receive V.sub.int. V.sub.out appears at the driver's output as an inverted, strengthened replica of V.sub.int. A first feedback circuit electrically connected between the driver's input and output applies a pull-down signal to the driver's input in response to a falling edge of V.sub.in, with the pull-down signal's strength varying in inverse proportion to propagation delay of the falling edge of V.sub.in. A second feedback circuit electrically connected between the driver's input and output applies a pull-up signal to the driver's input in response to a rising edge of V.sub.in, with the pull-up signal's varying in inverse proportion to propagation delay of the rising edge of V.sub.in.

REFERENCES:
patent: 4539489 (1985-09-01), Vaughn
patent: 5191245 (1993-03-01), Kang
patent: 5532630 (1996-07-01), Wagonner et al.
patent: 5594361 (1997-01-01), Campbell

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