Any body can talk about Rad hardened PLL design ?
Or someone has the papers below ?
Radiation hard PLL design tolerant to noise and process variations
Design of Phase Locked Loops for a Space Radiation Envi-ronment
Immunity to radiation can be obtained by using passive parts that are amorphous. This means ferrite or air core inductors, glass dielectric capacitors and metal film resistors. JFETS. For ICs there are special processes with higher doping than the usual.