Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Patent
1994-01-13
1996-02-20
Cunningham, Terry
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
327333, 327437, H03K 508
Patent
active
054932440
ABSTRACT:
A high voltage circuit includes a first switching device for supplying one of a high voltage (V.sub.pp) and a low voltage (V.sub.cc) to a controlled path that includes a series connection of a control p-channel transistor and a protection p-channel transistor. A high voltage detector is utilized to determine whether V.sub.pp or V.sub.cc is applied to the controlled path. The high voltage detector also establishes a protecting condition for the protection p-channel transistor during V.sub.pp operation. On the other hand, the detector establishes a non-protecting condition during V.sub.cc operation, thereby rendering the protecting p-channel transistor transparent to circuit performance. A signal input switches the control p-channel transistor between on and off states. When the control transistor is in an off state and the protection transistor is in a protecting condition, the voltage drop along the controlled path will cause the protection transistor to turn off, so as to limit the voltage across the control transistor. A second controlled path is preferably in series connection with the first controlled path. The second controlled path includes n-channel transistors, with one of the transistors fixed at V.sub.cc in order to guard against gate-aided junction breakdown of the other transistor. In this embodiment, the high voltage circuit is preferably an inverter circuit.
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Pathak Saroj
Payne James E.
Rosendale Glen A.
Atmel Corporation
Cunningham Terry
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