Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1996-09-20
1998-06-16
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327536, 327436, 327437, H03K 17795
Patent
active
057677336
ABSTRACT:
A field effect transistor (FET) includes a first source/drain terminal, a body terminal, and a second source/drain terminal. A bi-directional N-channel FET circuit includes a biasing circuit which couples the body terminal of the bi-directional FET to one of its first and second source/drain terminals having a lesser voltage when the first and second source/drain voltages differ by more than a threshold voltage. When the voltages differ by a threshold voltage or less, the body terminal floats at a voltage no higher than a diode drop above the lesser of the two source/drain voltages, and at a voltage no lower than a threshold voltage below the higher of the two source/drain voltages. An analogous bi-directional P-channel FET circuit is also described. Body effect is reduced because the body terminal of the FET is maintained at a voltage at or near the voltage of the effective source terminal at all times, irrespective of which of the two source/drain terminals is the effective source terminal. Consequently, the ON-resistance of the FET is reduced.
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Callahan Timothy P.
Integrated Device Technology Inc.
Luu An T.
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