Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Patent
1998-04-23
2000-06-13
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
327318, 327328, H03K 508
Patent
active
060753994
ABSTRACT:
An active clamp circuit for digital circuits includes a first MOSFET serially connected between an upper power supply voltage and an input terminal to be clamped, and a second MOSFET serially connected between a lower voltage power supply and the input terminal. The voltages at the gates of the first and second MOSFETs are held at constant first and second reference voltages by a reference circuit and the first reference voltage at the gate of the first MOSFET is less than the second reference voltage at the gate of the second MOSFET. The clamping action can be switched on or off. The device is particularly suited for use with silicon-on-insulator and bulk triple well technologies, where the MOSFETs are dynamic threshold MOSFETs.
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Hui David T.
Voldman Steven H.
Callahan Timothy P.
International Business Machines - Corporation
Nguyen Hai L.
Peterson Peter W.
Shkurko Eugene I.
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