CMOS-integrated temperature relay based on Wilson mirror [articol]

Abstract

As a première, here is presented a temperature relay scheme for CMOS chips, based on a simple structure of voltage source with two crossconnected current mirrors (of Wilson type and simple one). In this scheme the positive feedback is exploited; it is designed in such a way that, for a particular temperature, the circuit toggles. The output voltage performs a level jump, ample enough to drive an interface circuit with the relay signalisation processing part. The relay toggle condition is inferred which clears up the relay function. The releasing temperature may be programmed in a large range through one or two resistors. The simulation results are presented for the relay conceived in 0.35µm CMOS process. The releasing-temperature process variation is reduced, by a special design, to a maximum value of ±5.5°C.