Series resistance (Rsd) causes significant degradation of gm in junctionless transistors (JLTs). Rsd in short channels also strongly affects the onset of second peak in dgm/dVg of JLTs. The Rsd effects are successfully de-embedded by using a simple equation. Rsd de-embedding procedure can suggest a new method to extract better Vth and Vfb in JLTs. An analytical modeling study confirms those results.