The NCAP Nonlinear T Model for Bipolar Junction Transistors at UHF Frequencies

The Nonlinear Circuit Analysis Program (NCAP) has been used to calculate nonlinear transfer functions which subsequently predict Electromagnetic Interference (EMI) effects in electronic circuits containing discrete semiconductor devices for RF frequencies up to 100 MHz. However, NCAP has not previously been tested nor documented in the UHF frequency range (300 to 3000 MHz). The purpose of this paper is to present the first predicted results of EMI effects in discrete bipolar junction transistors, using NCAP's nonlinear transfer functions, in the UHF range. The predicted results will be compared to experimental results.