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Strained-silicon MOSFETs with both high breakdown voltage and low leakage current needed for RF/analog applications were investigated. Proper control of junction-depth profile and strained-silicon-layer thickness significantly improved transconductance, on resistance, and leakage current. Breakdown voltage of strained-silicon MOSFETs was the same as silicon MOSFETs even at elevated temperatures. RF/analog performances, such as cutoff frequency and 1/f noise, were improved by this technology while keeping high-driving-voltage capability.