B-spline based, large-signal DC and microwave-model for SOI MOSFETs
We present a large/small-signal, non-quasi-static, charge conserving, SOI MOSFET modeling technique suitable for DC and high frequency circuit design. The device model is extracted from small signal microwave iso-thermal Y-parameter data and DC I-V characteristics. Low frequency dispersions associated with self-heating and floating body effects are verified to not limit the performance of this technique since it relies on both DC and transient I-V characteristics. The technique is applied to the modeling of a short-channel, partially depleted, SOI nMOSFET simulated on PISCES. The model generated is incorporated into a circuit simulator, which is used to perform large-signal transient and harmonic balance simulations. The transient I-V and gate charge extracted from the iso-thermal small-signal microwave Y-parameters, are in excellent agreement with the iso-thermal transient I-V and gate charge obtained from PISCES, respectively. The model topology is extended with a parasitic bipolar sub-circuit which automatically calculates the DC operating point for self-biasing circuits. Transient and non-linear power characterization results predicted with this model agree well with those obtained from PISCES for a wide range of input power drives. A complete electro-thermal model is proposed and verified to be able to predict temperature and transient I-V response.
b-spline electro-thermal model microwave modeling soi technology transient iv kink effect