Various logic elements such as SR flip-flops, JK flip-flops, D-type
flip-flops, master-slave flip-flops, parallel and serial shift registers,
and the like are converted into non-volatile logic elements capable of
retaining a current output logic state even though external power is
removed or interrupted through the strategic addition of ferroelectric
capacitors and supporting circuitry. In each case, the building blocks of
a cross-coupled sense amplifier are identified within the logic element
and the basic cell is modified and/or optimized for sensing performance.