Different designs with reservation of power supply are analyzed in this article. The developers of high reliable computing systems often use n-of-m reservation technique to provide fault-tolerance in a digital circuit. It is need three channels and special gate і voter (major) to traditional two-of-three reservation in most simple design. Tolerance to failures in power supply, gates and wires can be provided using of this technique at the same time triplication of voter should be used to provide tolerance to failures in voter. The authors proposed using of reservation at transistor-level in combination with n-of-m reservation because it provides more opportunities in optimization. At first, authors researched using of redundant gates in fault-tolerant computing systems, then reservation at transistor-level of pull-up and pull-down networks. In this paper, influence of power supply on a circuit reliability is analyzed and technique of reservation at transistor-level is improved.

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