Pseudo-Schottky diode
First Claim
1. A combination of a MOSFET and a pseudo-Schottky diode comprising:
- a semiconductor chip;
a first gate electrically insulated from a second gate, said first gate being separated from said semiconductor chip by a first insulating layer, said second gate being separated from said semiconductor chip by a second insulating layer;
said semiconductor chip comprising;
a source region of a first conductivity type comprising a first portion adjacent said first insulating layer and a second portion adjacent said second insulating layer;
a body region of a second conductivity type comprising a first portion adjacent said first insulating layer and a second portion adjacent said second insulating layer;
a drain region of said first conductivity type adjacent said first and second portions of said body region and said first and second insulating layers, wherein said second portion of said source region and said second portion of said body region are shorted together, and wherein said first portion of said source region, said first portion of said body region and said first gate are shorted together.
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Accused Products
Abstract
An N-channel MOSFET is fabricated with its source, body and gate connected together and biased at a positive voltage with respect to its drain. The resulting two-terminal device functions generally in the manner of a diode but has a significantly lower turn-on voltage than a conventional PN diode. The device is therefore referred to as a “pseudo-Schottky mode”. Pseudo-Schottky diodes have numerous uses, but they are particularly useful when connected to shunt current from a conventional PN diode or MOSFET and thereby prevent such conditions as snapback and latchup which can result from the storage of minority carriers in a forward-biased PN junction. Also, because the pseudo-Schottky diode is a majority carrier device, the diode recovery time, amount of stored charge, and peak reverse current are much lower than in a conventional PN diode.
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Citations
11 Claims
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1. A combination of a MOSFET and a pseudo-Schottky diode comprising:
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a semiconductor chip;
a first gate electrically insulated from a second gate, said first gate being separated from said semiconductor chip by a first insulating layer, said second gate being separated from said semiconductor chip by a second insulating layer;
said semiconductor chip comprising;
a source region of a first conductivity type comprising a first portion adjacent said first insulating layer and a second portion adjacent said second insulating layer;
a body region of a second conductivity type comprising a first portion adjacent said first insulating layer and a second portion adjacent said second insulating layer;
a drain region of said first conductivity type adjacent said first and second portions of said body region and said first and second insulating layers, wherein said second portion of said source region and said second portion of said body region are shorted together, and wherein said first portion of said source region, said first portion of said body region and said first gate are shorted together. - View Dependent Claims (2)
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3. An integrated circuit chip comprising:
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a semiconductor device comprising;
a first region of a first conductivity type; and
a second region of a second conductivity type, said first region and said second region being adjacent to each other and being separated by a first PN junction; and
a pseudo-Schottky diode comprising a source region of said second conductivity type;
a body region of said first conductivity type adjacent said source region;
a drain region of said second conductivity type adjacent said body region; and
a gate separated by an insulating layer from a channel region of said body region, wherein said source region, said body region, said gate and said first region are shorted together and wherein said drain region and said second region are shorted together. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11)
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Specification