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CNFET is one of the most promising candidates for a building block of post silicon era integrated circuits due to its excellent electronic properties. The presence of unwanted metallic tubes is identified as a major challenge towards building robust CNT based circuits. Metallic tubes negatively impact the performance, power and yield of CNFET-based circuits. Current CNT growth techniques described in the literature show a wide range, from close to 4% to almost 40%, of metallic tubes being initially present in CNFETs. We used Monte Carlo simulation to analyze yield improvement techniques in both cases; (1) when metallic tubes are present in CNFETs, and (2) when they are removed with extra processing techniques proposed by researches. We proposed design-based promising methods for yield improvement. Suggested and analyzed yield-improvement techniques include transistor, gate and circuit level approaches.