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. 2015 Jun 30;3:93. doi: 10.3389/fbioe.2015.00093

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Copyright © 2015 Beal.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Low noise ΔSNR_dB in a chain of inverters: (A–D) show chains of one to four Device A elements, (E–H) show chains of Device B elements, and (I–L) show chains of Device C elements. Notice that for Device A there is a range of widely separated inputs (approximately μ_g,false < 10^5.5, μ_g,true > 10⁶), where it is possible for SNR to remain strong; Device B is weaker and less well matched between input and output, and thus any computation with more than a single element has a badly degraded signal strength for all possible inputs. Device C, on the other hand, degrades incrementally in SNR across a broad range. Note that the color scales are truncated at the lower end to provide better resolution in the upper range.