High voltage structures with oxide isolated source and resurf drift region in bulk silicon
First Claim
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1. A high voltage power transistor, comprising:
- a source isolated, embedded gate MOS transistor having a gate region formed in a semiconductor substrate, and having a source region, a drain region, and a channel region, wherein the source region and the drain region are separated by the channel region which is located above the gate region and the source region, drain region and channel region overlie an insulating layer covering a portion of the substrate; and
a bulk semiconductor drain drift region connected to the drain region through an opening in the insulating layer of the source isolated, embedded gate MOS transistor.
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Abstract
An integrated circuit RESURF LDMOS power transistor employs a source isolated, embedded gate MOS transistor with RESURF LDMOS technology to provide a source isolated high voltage power transistor with low "on" resistance for use in applications requiring electrical isolation between the source and substrate.
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Citations
15 Claims
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1. A high voltage power transistor, comprising:
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a source isolated, embedded gate MOS transistor having a gate region formed in a semiconductor substrate, and having a source region, a drain region, and a channel region, wherein the source region and the drain region are separated by the channel region which is located above the gate region and the source region, drain region and channel region overlie an insulating layer covering a portion of the substrate; and a bulk semiconductor drain drift region connected to the drain region through an opening in the insulating layer of the source isolated, embedded gate MOS transistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A high voltage power transistor with electrical isolation between source and substrate, comprising:
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a drain drift region formed in a semiconductor substrate having a drain contact and an interconnect contact; and a source isolated, embedded gate MOS transistor having a source region formed on an insulating layer overlying the substrate, a drain region forming a drain interconnect formed on the insulating layer, the source region and the drain region separated by a channel region that also overlies the insulating layer, a gate region formed in the substrate and located below the channel, a source contact connected to the source region, a gate contact connected to the gate region through an opening in the channel and the insulating layer, and the drain interconnect connected to the interconnect contact of the drain drift region through an opening in the insulating layer.
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15. A high side driver configuration with a high voltage power transistor having its source region isolated from the substrate, comprising:
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a drain drift region formed in a semiconductor substrate having a drain contact and an interconnect contact with the drain contact connected to a power supply; and a source isolated, embedded gate MOS transistor having a source region formed on an insulating layer overlying the substrate, a drain region forming a drain interconnect formed on the insulating layer, the source region and drain region separated by a channel region that also overlies the insulating layer, a gate region formed in the substrate and located below the channel, a source contact connected to the source region, a gate contact connected to the gate region through an opening in the channel and the insulating layer, and the drain interconnect connected to the interconnect contact of the drain drift region through an opening in the insulating layer.
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Specification