Measurement of intrinsic capacitance of lightly doped drain (LDD) MOSFET's

Intrinsic capacitance of lightly doped drain (LDD) MOSFET's is measured by means of a four-terminal method without using any on-chip measurement circuits. The gate-to-drain capacitance C
gd
of LDD MOSFET's is smaller than that of conventional MOSFET's in the saturation region. The technique is applied to determine the effective channel length.