Patent ID: 6909637

Claim:
A hardening system comprising: a data storage device having a data input, a clock input, and a data state reinforcing feedback path having a data node Q and a data complement node QN, wherein the data storage device is arranged to provide drive to the data node Q and the data complement node QN; and, a hardening circuit coupled to the data state reinforcing feedback path, wherein the hardening circuit comprises first and second transistor circuits forming a first node therebetween, wherein the first transistor circuit is coupled to the data node Q so as to prevent the data node Q from changing states in the presence of radiation, third and fourth transistor circuits forming a second node therebetween, wherein the third transistor circuit is coupled to the data complement node QN so as to prevent the data complement node QN from changing states in the presence of radiation, wherein the first node is coupled to the third transistor circuit, and wherein the second node is coupled to the first transistor circuit, and a fifth transistor circuit coupled to the first and second nodes so as to prevent the first and second nodes from floating.