Bi-directional transistor and method therefor
First Claim
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1. A method of forming a bi-directional transistor comprising:
- forming a first MOS transistor on a semiconductor substrate of a first conductivity type;
forming a body region of the first MOS transistor as a first doped region of a first conductivity and a first doping concentration on a surface of the semiconductor substrate and isolated from a first current carrying electrode region of the first MOS transistor by a first P-N junction and isolated from a second current carrying electrode region of the first MOS transistor by a second P-N junction;
forming a source region of the first MOS transistor as a second doped region of a second conductivity type and a second doping concentration that is overlying a portion of the body region;
forming a third doped region of the second conductivity type between the source region and the body region; and
forming a second MOS transistor coupled to selectively couple the body region of the first MOS transistor to the first current carrying electrode of the first MOS transistor.
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Abstract
In one embodiment, a transistor is formed to conduct current in both directions through the transistor.
45 Citations
13 Claims
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1. A method of forming a bi-directional transistor comprising:
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forming a first MOS transistor on a semiconductor substrate of a first conductivity type; forming a body region of the first MOS transistor as a first doped region of a first conductivity and a first doping concentration on a surface of the semiconductor substrate and isolated from a first current carrying electrode region of the first MOS transistor by a first P-N junction and isolated from a second current carrying electrode region of the first MOS transistor by a second P-N junction; forming a source region of the first MOS transistor as a second doped region of a second conductivity type and a second doping concentration that is overlying a portion of the body region; forming a third doped region of the second conductivity type between the source region and the body region; and forming a second MOS transistor coupled to selectively couple the body region of the first MOS transistor to the first current carrying electrode of the first MOS transistor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of forming a bi-directional transistor comprising:
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providing a semiconductor substrate of a first conductivity type; forming a first doped region of a second conductivity type on a surface of the semiconductor substrate as a body region of a first transistor; forming a second doped region of the first conductivity type within the first doped region and extending a first distance into the first doped region as a first current carrying electrode region of the first transistor; and forming a third doped region of the first conductivity type and extending from the second doped region a second distance into the first doped region. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of forming a bi-directional transistor comprising:
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providing a semiconductor substrate of a first conductivity type; forming a first doped region of a second conductivity type on a surface of the semiconductor substrate as a body region of a first transistor; forming a second doped region of the first conductivity type having a first doping concentration within the first doped region and extending a first distance into the first doped region as a first current carrying electrode region of the first transistor; and forming a third doped region of the first conductivity type having a second doping concentration that is less than the first doping concentration and extending from the second doped region a second distance into the first doped region wherein the second distance is greater than the first distance.
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Specification