Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1992-10-13
1994-01-25
Wambach, Margaret R.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307263, 307570, 307254, 307456, 307300, H03K 1760, H03K 512
Patent
active
052818624
ABSTRACT:
An output circuit includes a totem-pole output circuit for driving a power MOSFET. A pull-up circuit and a pull-down circuit drive the output node low or high as required. The circuit prevents the pull-up and pull-down circuits from simultaneously conducting current. The pull-up circuit has a pull-up threshold voltage and the pull-down circuit has a pull-down threshold voltage such that the pull-up circuit is turned off before the pull-down circuit is activated when the output node is switched from a high state to a low state and further wherein the pull-down circuit is turned off before the pull-up circuit is activated when the output node switches from a low state to a high state. The pull-up circuit is held off when the output node is switched from a high state to a low state by two diodes from the output node to an input of the pull-up circuit. The diodes are connected in series, one diode having its anode coupled to the output node and the cathode of the other diode coupled to the input of pull-up circuit. The pull-down circuit is cut off before the pull-up Darlington drives the output from low to high by having the pull-down threshold higher than the pull-up threshold. A resistor connected between the base of the controlling transistor for the pull-up Darlington and the ground shortens the output low-to-high propagation delay time and the output rise time by shunting transient parasitic capacitance current of the pull-up controlling transistor to the ground.
REFERENCES:
patent: 4081695 (1978-03-01), Allen et al.
patent: 4423341 (1983-12-01), Shelly
patent: 4507575 (1985-03-01), Mori et al.
patent: 5034631 (1991-07-01), Mouret
Micro Linear Corporation
Wambach Margaret R.
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