Dynamic thermal circuit of SOI MOSFETs for fast digital operation

A dynamic thermal circuit for SOI MOSFETs with time-varying thermal resistances and capacitances has been developed for fast digital operation of SOI CMOS circuits. The thermal circuit is derived from a dynamic thermal model resulting from the variational principle. With the circuit implemented in SPICE, these time-varying circuit elements are able to reasonably describe extremely fast evolution of the temperature profile in SOI devices without including a large number of nodes.