Power semiconductor devices having linear transfer characteristics when regions therein are in velocity saturation modes and methods of forming and operating same
First Claim
1. An integrated power device, comprising:
- an insulated-gate field effect transistor that is configured to support an inversion-layer channel during forward on-state conduction, said inversion-layer channel being operable in a linear mode of operation while a drain region of said insulated-gate field effect transistor simultaneously operates in a velocity saturation mode of operation.
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Accused Products
Abstract
Power MOSFET devices provide highly linear transfer characteristics (e.g., Id v. Vg) and can be used effectively in linear power amplifiers. These linear transfer characteristics are provided by a device having a channel that operates in a linear mode and a drift region that simultaneously supports large voltages and operates in a current saturation mode. A relatively highly doped transition region is provided between the channel region and the drift region. Upon depletion, this transition region provides a potential barrier that supports simultaneous linear and current saturation modes of operation. Highly doped shielding regions may also be provided that contribute to depletion of the transition region.
156 Citations
16 Claims
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1. An integrated power device, comprising:
an insulated-gate field effect transistor that is configured to support an inversion-layer channel during forward on-state conduction, said inversion-layer channel being operable in a linear mode of operation while a drain region of said insulated-gate field effect transistor simultaneously operates in a velocity saturation mode of operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A UMOSFET, comprising:
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a semiconductor substrate having a source region and a drain contact region of first conductivity type therein;
a trench in said substrate;
an insulated gate electrode in said trench;
a base region of second conductivity type in said semiconductor substrate, said base region extending to a sidewall of said trench so that application of a gate bias of sufficient magnitude to said insulated gate electrode induces formation of an inversion-layer channel in said base region;
a drift region of first conductivity type on the drain contact region, said drift region extending to the sidewall of said trench; and
a transition region that extends between said drift region and said base region and forms non-rectifying and rectifying junctions therewith, respectively, said transition region having a higher first conductivity type doping concentration therein relative to a first conductivity type doping concentration in a portion of said drift region extending adjacent the non-rectifying junction.
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16-111. -111. (Cancelled)
Specification