Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Utilizing three or more electrode solid-state device
Patent
1998-10-29
2000-04-18
Le, Dinh T.
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Utilizing three or more electrode solid-state device
327427, 327387, 327391, 327534, H03K 301
Patent
active
060520191
ABSTRACT:
A bus switch has an n-channel bus-switch transistor that connects an input-bus signal to an output bus. A gate protection circuit prevents undershoots on the inputs from coupling to the output when the bus switch isolates the buses. The gate of the bus-switch transistor is driven to ground during isolation mode. When a high-to-low transition of the input-bus signal is detected, a pulse generator generates a pulse. The pulse disconnects the gate from ground. A connecting n-channel transistor with its gate connected to ground connects the gate to the input-bus signal when the undershoot pulls the input-bus signal below ground. Internal circuitry is isolated from the below-ground gate by an isolating n-channel transistor that has its gate driven by the input-bus signal during the pulse. A substrate bias generator is used for N-well processes, but P-well processes use a well protection circuit. The P-well under the bus-switch transistor is disconnected from ground during the generated pulse. Another n-channel connecting transistor with its gate grounded connects the P-well to the input-bus signal when the undershoot occurs. The protection circuits are only enabled when the bus switch transistor is in the isolation mode and a low-going transition of the input-bus signal is detected.
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Auvinen Stuart T.
Le Dinh T.
Pericom Semiconductor Corp.
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