Lateral device with improved conductivity and blocking control
First Claim
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1. A lateral transistor device comprising:
- a lightly doped layer of semiconductor material having first and second more heavily doped regions of a first conductivity type formed along a surface thereof;
a third region of a second conductivity type between the first and second regions;
a lightly doped region of the first conductivity type between the second and third regions;
a control electrode positioned to enable conduction through the third region; and
a biasing electrode structure positioned along the third region to alter the electric field in the third region.
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Abstract
An LDMOS device is made on a semiconductor substrate 112. It has an N+ source and drain regions 120, 132 are formed within a P well region 122. An interlevel dielectric layer 140 encapsulates biased charge control electrodes 142a and they control the electric field within the area of the drift region 14 between P-base 122 and the N drain region 132 to increase the reverse breakdown voltage of the device. This permits the user to more heavily dope the drift region and achieve a lower on resistance.
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Citations
24 Claims
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1. A lateral transistor device comprising:
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a lightly doped layer of semiconductor material having first and second more heavily doped regions of a first conductivity type formed along a surface thereof;
a third region of a second conductivity type between the first and second regions;
a lightly doped region of the first conductivity type between the second and third regions;
a control electrode positioned to enable conduction through the third region; and
a biasing electrode structure positioned along the third region to alter the electric field in the third region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A lateral transistor device with enhanced breakdown voltage, comprising:
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a lightly doped layer of semiconductor material having more heavily doped source and drain regions of a first conductivity type formed therein;
a channel region of a second conductivity type adjacent the source region and between the source and drain regions;
a drift region of the lightly doped semiconductor material disposed between the channel and the drain regions;
a control electrode disposed over the channel region for controlling the flow of current between the source and drain regions; and
bias electrodes disposed adjacent the drift region to alter the electric field in the drift region to increase reverse breakdown voltage. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification