A new technique to measure the lateral distributions of both interface traps and trapped oxide charge near the source/drain junctions in MOSFET's will be presented in detail. This technique derives from the charge pumping method, is easy to implement, and allows ready separation of the interface-trap and oxide charge components. This paper will cover the experimental details of this technique, along with some illustrative results. The various issues involved in its implementation and its practical limitations will also be discussed.