Kink-free SOI analog circuit design with floating-body/NFD MOSFETs

A novel design approach to ensure general kink-free operation of floating-body/nonfully depleted (NFD) SOI analog circuits is described. The approach involves optimization of the bias and aspect ratios of all transistors that determine gain and current in a circuit such that they operate only in their kink-free voltage windows. The approach is demonstrated via a simulation-based design of the current cells of a 10-b floating-body/NFD DAC that shows good linearity and resolution at dc and frequencies up to 1 GHz. In contrast, the floating-body/NFD DAC without proper optimization shows poor and prohibitive performance.