A new test structure for extracting extrinsic parameters in double-polysilicon bipolar transistors

A new test structure for parameter extraction is presented and implemented in a double-polysilicon bipolar junction transistor (BJT) process. The test structure is basically a real BJT, but without the intrinsic base. The test structure allows extraction of the base, collector and emitter impedances, and the extrinsic base-collector capacitance.