Single event upset immune register with fast write access
First Claim
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1. A single event upset hardened bi-stable circuit comprising in combination:
- a first complementary pair of CMOS semiconductor transistors including a first PMOS transistor and a first NMOS transistor with a first isolation resistor coupling a drain node of said first PMOS transistor to a drain node of said first NMOS transistor;
a second complementary pair of CMOS semiconductor transistors including a second PMOS transistor and a second NMOS transistor with a second isolation resistor coupling a drain node of said second PMOS transistor to a drain node of said second NMOS transistor;
first low impedance means coupling said drain node of said first PMOS transistor to a gate of said second PMOS transistor;
second low impedance means coupling said drain node of said first NMOS transistor to a gate of said second NMOS transistorthird low impedance means coupling said drain node of said second PMOS transistor to a gate of said first PMOS transistor;
fourth low impedance means coupling said drain node of said second NMOS transistor to a gate of said first NMOS transistor;
write input means coupled to a gate electrode of said first PMOS transistor and a gate electrode of said first NMOS transistor.
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Abstract
A single event upset hardened bi-stable CMOS circuit has a pair of cross coupled invertors with an isolation resistor in the path coupling the drains of the transistors in each invertor. Each invertor includes a PFET and a NFET pair coupled source to drain. An isolation resistor couples together the drains of each PFET-NFET pair and two low impedance conductive paths provide a direct coupling between the drains of each transistor of one invertor to common gate node of the other invertor.
55 Citations
4 Claims
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1. A single event upset hardened bi-stable circuit comprising in combination:
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a first complementary pair of CMOS semiconductor transistors including a first PMOS transistor and a first NMOS transistor with a first isolation resistor coupling a drain node of said first PMOS transistor to a drain node of said first NMOS transistor; a second complementary pair of CMOS semiconductor transistors including a second PMOS transistor and a second NMOS transistor with a second isolation resistor coupling a drain node of said second PMOS transistor to a drain node of said second NMOS transistor; first low impedance means coupling said drain node of said first PMOS transistor to a gate of said second PMOS transistor; second low impedance means coupling said drain node of said first NMOS transistor to a gate of said second NMOS transistor third low impedance means coupling said drain node of said second PMOS transistor to a gate of said first PMOS transistor; fourth low impedance means coupling said drain node of said second NMOS transistor to a gate of said first NMOS transistor; write input means coupled to a gate electrode of said first PMOS transistor and a gate electrode of said first NMOS transistor. - View Dependent Claims (2, 3, 4)
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Specification