Self restoring logic structures

Abstract

A SEU tolerant structure has two logic sections that generate two output signals that are complementary such that a fault which affects one section cannot affect the other section. Adjacent NMOS regions or adjacent PMOS regions contain no logic inversions in the combinational logic or if logic inversions in the combinational logic are present where all gates following the inversion are SEU hard by design. The circuits can be realized using one of a Complex CMOS gate, pass transistor logic, Multiplexor logic, AND-OR logic or OR-AND logic. A SRL latch is formed of three NMOS and PMOS structures having a first latch with a first NMOS structure adjacent a first PMOS structure, a second latch with a second NMOS structure adjacent a second PMOS structure wherein the first and second NMOS structures are adjacent one another, and a third latch with a third NMOS structure adjacent a third PMOS structure wherein the second and third PMOS structures are adjacent one another, wherein the latch is adapted to have alternating logic with a state assignment of 010 and 101. A Single Event Upset Triple Modular Redundancy (TMR) tolerant circuit generates complementary output values 010 and 101 with layouts that are adjacent.