Single event transient hardened delay cell for a differential ring VCO

摘要

This paper presents a new single event transient hardened complementary delay cell (SET-H CDC) for radiation environment. The performance of the proposed topology has been compared with the existing radiation-hardened delay cell topologies called wide tuning delay cell and complementary delay cell (CDC). A three-stage VCO has been designed with each of the delay cell topologies for low power consumption while maintaining maximum swing. The VCO is designed using 90 nm CMOS process technology work with 1 Volt DC supply operating at 2.6 GHz frequency. The proposed topology shows better single event tolerance and reduced Impulse Sensitivity Function (ISF) while maintaining a rail-rail swing over a wide frequency tuning range. The proposed topology achieves a 17% improvement in rms ISF compared to wide tuning delay cell and 1.2% improvement compared to CDC delay cell.