Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Slope control of leading or trailing edge of rectangular or...
Patent
1994-10-14
1996-07-16
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Slope control of leading or trailing edge of rectangular or...
327262, 327374, 327538, 327379, H03K 1756
Patent
active
055370705
ABSTRACT:
An output driver for use with low voltage level, high speed data transmission busses. An open drain output transistor has a controlled slew rate for a high to low output transition. The slew rate control is provided by controlling the slew rate of the gate voltage of the output transistor in response to an input transition. A slew rate control circuit coupled to the output transistor includes a current source powered by a high stability bias generator, a diode and a capacitance. The current source controls the amount of current available at the gate of the output transistor. The diode and the capacitance combined are used to control the initial voltage at the gate of the output transistor, and the slew rate for the rising voltage waveform at the gate of the output transistor. The resulting circuit has a fast transition time in response to an input transition combined with a tightly controlled slew rate. The output circuit described can meet the proposed specifications for the low voltage level, fast transition busses currently being developed.
REFERENCES:
patent: 4504779 (1985-03-01), Haman
patent: 5124570 (1992-06-01), Meno et al.
patent: 5264736 (1993-11-01), Jacobson
patent: 5291071 (1994-03-01), Allen et al.
patent: 5300828 (1994-04-01), McClure
patent: 5311077 (1994-05-01), Brown
patent: 5334882 (1994-08-01), Ting
patent: 5352945 (1994-10-01), Casper et al.
Brady III W. James
Callahan Timothy P.
Donaldson Richard L.
Shin Eunja
Swayze, Jr. W. Daniel
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