The symmetric ternary current-mode CMOS circuits designed by using this theory not only have simpler circuit structures and correct logic functions, but also can process two-way signal.

CMOS symmetrical three-valued ternary logic circuit was designed and fabricated, based on the information associated with symmetrical ternary logic combined with CMOS circuit processing features.

The author depicts the necessity of adopting ternary logic in fault detection, with detailed introduction of the structure and operation principle for ternary logic fault detection circuit.