This work presents a 16MHz on-chip oscillator based on a frequency-locked loop (FLL) which is radiation hardened by design and intended for space applications. The oscillator maintains a high temperature stability over a wide range of temperatures, process and voltage variations. The FLL presents a 7-stage current starved ring oscillator using output signal combiners for lower radiation sensitivity. Furthermore, the system presents high reconfigurability by using several DACs to adjust the oscillator’s output frequency and the temperature slope dependency. This reconfigurability is especially useful to maintain all performances across PVT variations.