HYBRID SEMINAR IN 13-2-005 AND ZOOM

Abstract:

This talk aims to present several works on radiation tolerance developed at the Universidad Politécnica de Madrid. Three examples will be briefly described. The first work is a total ionization dose (TID) sensor that is fully digital and can be integrated in CMOS circuits; it has a configurable sensitivity that allows radiation doses ranging from very low to high levels; it is self-timed, so it does not need a clock signal. We designed, implemented, and manufactured the sensor in a 0.35 μm commercial CMOS technology. It was irradiated with a 60 Co source up to 575 krad. The sensor interface helps to integrate this design into a multidisciplinary sensor network, allowing the sensor to be used in a self-recovery system. 

The second work addresses the design of ring oscillators, which are one of the essential blocks in many electronic systems, including implementations for radiation environments. However, in this scenario, it has been shown that the ring oscillator produces harmonic frequencies as a result of Single-Event-Transients (SETs). We have developed a SET-tolerant ring oscillator that can be designed without area overhead by configuring the duty cycle of the ring oscillators. This configuration is based on the asymmetric design of the odd and even stages of the ring oscillator. The proposal was validated by simulation and with a manufactured chip including different test circuits and using SET-emulated injection. Both methods confirmed that the higher harmonics can be completely removed with the proposed technique.

Finally, a brief introduction is given to a recent effort in progress to study the radiation tolerance of flexible electronics.

Zoom details are also in the invitation email.

Make sure you have the latest Zoom client app to be able to connect https://cern.zoom.us/ -> Download client