Circuit structure which avoids latchup effect
First Claim
1. A circuit structure which avoids a latchup effect, the circuit structure comprising:
- a substrate;
an N-type doped region in the substrate;
an N-type contact in the N-type doped region;
a P-type metal oxide semiconductor on the N-type doped region, wherein a gate of the P-type metal oxide semiconductor connects to an input terminal, and a source region of the P-type metal oxide semiconductor connects to a voltage source;
a first N-type metal oxide semiconductor on the substrate, wherein a gate of the first N-type metal oxide semiconductor connects to the input terminal, a source region of the first N-type metal oxide semiconductor connects to a ground terminal, and a drain region of the first N-type metal oxide semiconductor connects to a drain region of the P-type metal oxide semiconductor and an output terminal; and
a second N-type metal oxide semiconductor on the substrate, wherein a gate of the second N-type metal oxide semiconductor connects to the output terminal, a drain region of the second N-type metal oxide semiconductor connects to the voltage source, and a source region of the second N-type metal oxide semiconductor connects to the N-type contact.
2 Assignments
0 Petitions
Accused Products
Abstract
A circuit structure which avoids a latchup effect. An N-well is formed in a P-type substrate. An N-type contact is formed in the N-well. A PMOS is located on the N-well. A gate of the PMOS connects to an input terminal and a source region of the PMOS connects to a voltage source. A first NMOS and a second NMOS are located on the P-type substrate. A gate of the first NMOS connects to the input terminal, a source region of the first NMOS connects to a ground terminal, and a drain region of the first NMOS connects to an output terminal and a drain region of the PMOS. A gate of the second NMOS connects to the output terminal, a source region of the second NMOS connects to a voltage source, and a drain region of the second NMOS connects to the N-type contact.
6 Citations
8 Claims
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1. A circuit structure which avoids a latchup effect, the circuit structure comprising:
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a substrate; an N-type doped region in the substrate; an N-type contact in the N-type doped region; a P-type metal oxide semiconductor on the N-type doped region, wherein a gate of the P-type metal oxide semiconductor connects to an input terminal, and a source region of the P-type metal oxide semiconductor connects to a voltage source; a first N-type metal oxide semiconductor on the substrate, wherein a gate of the first N-type metal oxide semiconductor connects to the input terminal, a source region of the first N-type metal oxide semiconductor connects to a ground terminal, and a drain region of the first N-type metal oxide semiconductor connects to a drain region of the P-type metal oxide semiconductor and an output terminal; and a second N-type metal oxide semiconductor on the substrate, wherein a gate of the second N-type metal oxide semiconductor connects to the output terminal, a drain region of the second N-type metal oxide semiconductor connects to the voltage source, and a source region of the second N-type metal oxide semiconductor connects to the N-type contact.
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2. A circuit structure which avoids a latchup effect, the circuit structure comprising:
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a semiconductor substrate; a doped region in the semiconductor substrate; a contact whose type is the same as the doped region in the doped region; a first MOS whose type is different from the doped region, wherein a gate of the first MOS connects to an input terminal, and a source region of the first MOS connects to a voltage source; a second MOS whose type is the same as the doped region on the semiconductor substrate, wherein a gate of the second MOS connects to the input terminal, a source region of the second MOS connects to a ground terminal, and a drain region of the second MOS connects to a drain region of the first MOS and an output terminal; and a third MOS whose type is the same as the doped region on the semiconductor substrate, wherein a gate of the third MOS connects to the output terminal, a drain region of the third MOS connects to the voltage source, and a source region of the third MOS connects to the contact. - View Dependent Claims (3)
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4. A circuit structure which avoids a latchup effect, the circuit structure comprising:
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a substrate; an N-type doped region in the substrate; an N-type contact in the N-type doped region; a P-type metal oxide semiconductor on the N-type doped region, wherein a source region of the P-type metal oxide semiconductor connects to a voltage source; a first N-type metal oxide semiconductor on the substrate, wherein a source region of the first N-type metal oxide semiconductor connects to a ground terminal, and a drain region of the first N-type metal oxide semiconductor connects to a drain region of the P-type metal oxide semiconductor; and second N-type metal oxide semiconductor on the substrate, wherein a gate of the second N-type metal oxide semiconductor connects to a drain region of the P-type metal oxide semiconductor, a drain region of the second N-type metal oxide semiconductor connects to the voltage source, and a source region of the second N-type metal oxide semiconductor connects to the N-type contact.
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5. A circuit which avoids a latchup effect, the circuit comprising:
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a P-type metal oxide semiconductor, wherein a source region of the P-type metal oxide semiconductor connects to a voltage source; a first N-type metal oxide semiconductor, wherein a source of the first N-type metal oxide semiconductor connects to a ground terminal and a drain region of the first N-type metal oxide semiconductor connects to a drain region of the P-type metal oxide semiconductor; and a second N-type metal oxide semiconductor, wherein a gate of the second N-type metal oxide semiconductor connects to the drain region of the P-type metal oxide semiconductor, a drain region of the second N-type metal oxide semiconductor connects to the voltage source, and a source region of the second N-type metal oxide semiconductor connects to a doped well region in a semiconductor substrate of the P-type metal oxide semiconductor. - View Dependent Claims (6, 7, 8)
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Specification