A process-insensitive thermal protection circuit

Abstract

A novel process-insensitive thermal protection structure has been developed. This circuit contains several sub-circuits such as band-gap reference, reference output buffer, resistance voltage divider branch, and hysteresis circuit. By using reference buffer, the precise reference voltage from band-gap reference is delivered to resistance voltage divider branch and is divided precisely. Then the threshold temperatures of this protection circuit can be set by this precise voltage, unaffected by process variation and mismatch. A hysteresis circuit is also used here to prevent thermal oscillation. This circuit is fabricated in TSMC 0.18 m CMOS technology, and occupies about 3 10 4 m 2 chip area.

Coexistence, bifurcation and chaos of a periodically forced duffing system with absolute nonlinearity

“…Zhivko [5] investigated a perturbed double-well Duffing system and got necessary conditions for the arising of limit cycles around the homoclinic trajectory via the Melnikov function method. In reference [6], according to the state equation of the system, the weak signal detection circuit based on Duffing oscillator was designed and fabricated. Xu [7] investigated the periodic motion for a nonlinear Duffing oscillator with time-varying delays, and based on the theory of exponential dichotomies and contraction mapping method, some novel results were obtained to illustrate the effectiveness of the theoretical analysis.…”