PSPICE model of the power LDMOS transistor for radio frequency applications in the 1.8-2.2 GHz Band

摘要

In this paper, we propose a model for the LDMOS transistor used for power amplification in the frequencies band 1.8-2.2 GHz dedicated to the mobile telephony system Digital Cellular System (DCS). This model takes into account the behaviour of each internal region of the power structure. A new representation of the non-linear inter-electrode capacitances, drain-gate C_(gd) and drain-source C_(ds), is proposed. The obtained model is implemented in the circuit simulator PSPICE, which gives an overall evaluation of the transistor performances in the radio frequency power amplification mode. This model is mainly intended to the system designer. A study of the power amplification in the SHF band at 2 GHz is performed. A good agreement between experimental and simulation results is found.