Output drivers in high frequency circuits

Details Output drivers in high frequency circuits Output drivers in high frequency circuits

1993-04-13

1995-10-31

Shoop, Jr., William M.

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

326 86, 326 58, 327185, 327409, H03K 326

Patent

active

054633265

ABSTRACT:
A high frequency circuit using output drivers with tri-state sections. The plurality of output drivers are connected to an output transmission line. Each driver has a pull-up section, a pull-down section and a tri-state section. Each tri-state section has a low impedance and a high impedance state. Its low impedance state serves to match the impedance of the output transmission line. Its high impedance state isolates its driver from the output transmission line.

REFERENCES:
patent: 3937982 (1976-02-01), Nakajima
patent: 4029971 (1977-06-01), Pryor
Knight, Thomas, F., "A Self-Terminating Low-Voltage Swing CMOS Output Driver", IEEE Journal of Solid-State Circuits, vol. 23, No. 2, Apr. 1988, pp. 457-464.
DeHon, Andre et al., "Automatic Impedance Control", IEEE International Solid-State Circuits Conference, 1993, pp. 164-165.

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