Restoration: Thresholding Gate
A signal restoration module consists of a threshold gate and an amplification gate, and its "incorporation into large circuits at multiple intermediate points ensures digital representation" (1587):
- Threshold gate: The threshold gate consists of three-input AND gate with identical first and third inputs. The second input is only necessary for structural purposes, and the third input is hybridized to an output strand. An insufficient amount of input will cause most gates to lose only their first and second gate strands, and not the third, therefore failing to release output.
- Amplification gate: An amplification gate is necessary because "the threshold gate's output cannot exceed half the input signal" (1587), and therefore must be amplified. Two methods for building an amplification gate are described: 1. A hybridization-based system for catalytic amplification, serving as both input amplifier and full translator, and 2. An amplifier based on feedback logic.