Clocked dosimeter compatible with digital CMOS technology

We present two versions of a radiation dosimeter, they are CMOS circuits built around a PMOSFET radiation sensor, compatible with standard technology. These dosimeters are intended to be used as built-in sensors in integrated circuits to signal misfunction danger due to radiation exposure, and so they have a binary output which changes its state when the total radiation dose exceeds a prefixed level. The first circuit is an improved version of a previously developed dosimeter which has less power consumption and sharper transfer characteristics. It has been built in ES2 1.0 mu m technology and we present experimental results. The second circuit is under development, it is a clocked dosimeter which samples the dose only during a very short time at each clock period and then remains at rest, to further reduce the power consumption.