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US 5,489,866 AGranted
High speed and low noise margin schmitt trigger with controllable trip point
AssigneeXilinx, Inc.
InventorSholeh Diba
Life of this patent
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AssigneeXilinx, Inc.
InventorSholeh Diba
Estimating the term…
An improved Schmitt trigger, especially useful for large scale integrated circuit applications, includes a buffer (inverter) having a pull up device and two pull down devices all connected between a voltage supply and ground, and each receiving the input signal at its gate terminal. A node between the output terminals of the pull down devices is connected to the output terminal of the Schmitt trigger. A feedback line connects the output terminal of the Schmitt trigger to the gate of an N-channel depletion device connected between the pull-up and pull-down devices. Also provided are two devices to control the timing of the Schmitt trigger; these two control devices are connected between the output terminal of the Schmitt trigger and the output terminal of the inverter. Also provided in one embodiment is electrostatic discharge protection connected to the Schmitt trigger input and output terminals, and in another embodiment a control device for turning on and off the supply voltage to the inverter.
A trigger circuit comprising;
A trigger circuit comprising:
A trigger circuit comprising:
Dependencies are inferred from the claim text.