Semiconductor integrated circuit device
View Patent ↗To strengthen tolerance to radiation. Source and back gate of P-channel transistor P 1 are connected to power supply. Gate of the P-channel transistor P 1 is connected to input terminal IN. Gate of N 1 is connected to IN. Drain of N 1 is connected to OUT. Cathode of diode D 1 is connected to power supply, anode of D 1 being connected to OUT. Cathode of diode D 2 is connected to OUT, anode of D 2 being grounded. When seen from a direction perpendicular to a substrate on which an inverter circuit is formed, a projection plane of a region of a p+ diffusion layer of D 1 includes a projection plane of a region of an n+ diffusion layer of N, and a projection plane of a region of an n+ diffusion layer of the diode D 2 includes a projection plane of a region of a p+ diffusion layer of P 1.
1. A semiconductor integrated circuit device comprising:
a logic circuit of a CMOS type formed by combining a field-effect transistor group of a first conductivity type with a field-effect transistor group of a second conductivity type,
said field-effect transistor group of the first conductivity type being connected between a power supply and an output terminal, said field-effect transistor group of the second conductivity type being connected between ground and said output terminal;
said logic circuit comprising:
a first diode connected between said power supply and said output terminal to provide an inverse bias; and
a second diode connected between said ground and said output terminal to provide an inverse bias;
wherein, when seen from a direction perpendicular to a first substrate having the logic circuit formed thereon, a projection plane of a diffusion layer region of the first diode includes projection planes of respective drain diffusion layer regions of transistors included in said field-effect transistor group of the second conductivity type; and the first substrate having respective drain diffusion layer regions of said transistors included in said field-effect transistor group of the second conductivity type being present therein is disposed separated from a second substrate having said diffusion layer region of the first diode being present therein; and
wherein, when seen from the direction perpendicular to the substrate having said logic circuit formed thereon, a projection plane of a diffusion layer region of the second diode includes projection planes of respective drain diffusion layer regions of transistors included in said field-effect transistor group of the first conductivity type; and the first substrate having respective drain diffusion layer regions of said transistors included in said field-effect transistor group of the first conductivity type being present therein is disposed separated from the second substrate having said diffusion layer region of the second diode being present therein.
2. The semiconductor integrated circuit device according to claim 1 , wherein said logic circuit comprises an inverter circuit having said field-effect transistor group of the first conductivity type comprising first transistors, and having said field-effect transistor group of the second conductivity type comprising second transistors.
3. The semiconductor integrated circuit device according to claim 2 , comprising:
two of said inverter circuits;
said two of said inverter circuits forming a latch circuit by combining an input terminal of one of said inverter circuits to an output terminal of the other of said inverter circuits and combining an input terminal of the other of said inverter circuits to an output terminal of the one of said inverter circuits.
4. The semiconductor integrated circuit device according to claim 1 , wherein
said logic circuit comprises a two-input NOR circuit in which said field-effect transistor group of the first conductivity type comprises first and second transistors connected in cascade, and said field-effect transistor group of the second conductivity type comprises third and fourth transistors connected in parallel.
5. The semiconductor integrated circuit device according to claim 1 , wherein
said logic circuit comprises a two-input NAND circuit in which said field-effect transistor group of the first conductivity type comprises first and second transistors connected in parallel, and said field-effect transistor group of the second conductivity type comprising third and fourth transistors connected in cascade.
6. The semiconductor integrated circuit device according to claim 4 , comprising:
two of said two-input NOR circuits;
said two of said two-input NOR circuits forming a flip-flop circuit by combining an input terminal of one of said two-input NOR circuits to an output terminal of the other of said two-input NOR circuits and combining an input terminal of the other of said two-input NOR circuits to an output terminal of the one of said two-input NOR circuits.
7. The semiconductor integrated circuit device according to claim 5 , comprising:
two of said two-input NAND circuits;
said two of said two-input NAND circuits forming a flip-flop circuit by connecting an input terminal of one of said two-input NAND circuits to an output terminal of the other of said two-input NAND circuits and connecting an input terminal of the other of said two-input NAND circuits to an output terminal of the one of said two-input NAND circuits.
8. The semiconductor integrated circuit device according to claim 1 , wherein the substrate having the respective drain diffusion layer regions being present therein and the substrate having said diffusion layer region of the first diode being present therein are superposed together interposed with an insulating layer.
9. The semiconductor integrated circuit device according to claim 8 , wherein said insulating layer includes therein:
a wiring pattern that makes electrical connection between the first substrate with the respective drain diffusion layer regions being present therein and the second substrate having said diffusion layer region of the first diode being present therein.
10. A semiconductor integrated circuit device comprising:
a logic circuit of a CMOS type formed by combining a first conductivity type field-effect transistor with a second conductivity type field-effect transistor,
said first conductivity type field-effect transistor being connected between a power supply and an output terminal, the second conductivity type field-effect transistor being connected between ground and said output terminal;
said logic circuit comprising:
a first diode connected between said power supply and said output terminal to provide an inverse bias; and
a second diode connected between said ground and said output terminal to provide an inverse bias;
wherein, when seen from a direction perpendicular to a first substrate having said logic circuit formed thereon, a projection plane of a diffusion layer region of the first diode includes a projection plane of a drain diffusion layer region of the second conductivity type field-effect transistor; and the first substrate having said drain diffusion layer region being present therein is disposed separated from a second substrate having said diffusion layer region of the first diode being present therein; and
wherein, when seen from the direction perpendicular to the first substrate having said logic circuit formed thereon, a projection plane of a diffusion layer region of the second diode includes a projection plane of a drain diffusion layer region of the first conductivity type field-effect transistor; and the first substrate having said drain diffusion layer region being present therein is disposed separated from the second substrate having said diffusion layer region of the second diode being present therein.